possible deadlock in io_submit_one

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syzbot

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Apr 10, 2019, 1:51:07 PM4/10/19

to syzkaller...@googlegroups.com

Hello,

syzbot found the following crash on:

HEAD commit: 4d552acf Linux 4.19.34
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=145e62bf200000
kernel config: https://syzkaller.appspot.com/x/.config?x=c95a88291f095edd
dashboard link: https://syzkaller.appspot.com/bug?extid=a382f9fc143e31d6afb6
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a382f9...@syzkaller.appspotmail.com

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
4.19.34 #2 Not tainted
-----------------------------------------------------
syz-executor.4/24529 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
000000001f710178 (&ctx->fd_wqh){....}, at: spin_lock
include/linux/spinlock.h:329 [inline]
000000001f710178 (&ctx->fd_wqh){....}, at: aio_poll fs/aio.c:1756 [inline]
000000001f710178 (&ctx->fd_wqh){....}, at: io_submit_one+0xd7c/0x1b20
fs/aio.c:1859

and this task is already holding:
00000000a266ff4c (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq
include/linux/spinlock.h:354 [inline]
00000000a266ff4c (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll
fs/aio.c:1755 [inline]
00000000a266ff4c (&(&ctx->ctx_lock)->rlock){..-.}, at:
io_submit_one+0xd53/0x1b20 fs/aio.c:1859
which would create a new lock dependency:
(&(&ctx->ctx_lock)->rlock){..-.} -> (&ctx->fd_wqh){....}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(&(&ctx->ctx_lock)->rlock){..-.}

... which became SOFTIRQ-irq-safe at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x60/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
free_ioctx_users+0x2d/0x4a0 fs/aio.c:604
percpu_ref_put_many include/linux/percpu-refcount.h:284 [inline]
percpu_ref_put include/linux/percpu-refcount.h:300 [inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123 [inline]
percpu_ref_switch_to_atomic_rcu+0x3e7/0x520 lib/percpu-refcount.c:158
__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2584 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
rcu_process_callbacks+0xba9/0x1a40 kernel/rcu/tree.c:2881
__do_softirq+0x266/0x92f kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867
arch_local_irq_disable arch/x86/include/asm/paravirt.h:793 [inline]
arch_local_irq_save arch/x86/include/asm/paravirt.h:806 [inline]
lock_is_held_type+0xae/0x210 kernel/locking/lockdep.c:3937
lock_is_held include/linux/lockdep.h:344 [inline]
rcu_read_lock_held kernel/rcu/update.c:287 [inline]
rcu_read_lock_held+0xa3/0xd0 kernel/rcu/update.c:279
get_mem_cgroup_from_mm mm/memcontrol.c:850 [inline]
get_mem_cgroup_from_mm+0x247/0x2b0 mm/memcontrol.c:833
get_mem_cgroup_from_current mm/memcontrol.c:896 [inline]
memcg_kmem_charge+0x119/0x300 mm/memcontrol.c:2646
__alloc_pages_nodemask+0x3c6/0x760 mm/page_alloc.c:4413
alloc_pages_current+0x107/0x210 mm/mempolicy.c:2147
alloc_pages include/linux/gfp.h:509 [inline]
pipe_write+0xa65/0xfb0 fs/pipe.c:430
call_write_iter include/linux/fs.h:1811 [inline]
new_sync_write fs/read_write.c:474 [inline]
__vfs_write+0x58e/0x820 fs/read_write.c:487
vfs_write+0x20c/0x560 fs/read_write.c:549
ksys_write+0xea/0x1f0 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe

to a SOFTIRQ-irq-unsafe lock:
(&ctx->fault_pending_wqh){+.+.}

... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_release+0x497/0x6d0 fs/userfaultfd.c:917
__fput+0x2df/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x14a/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x933/0x2fa0 kernel/exit.c:876
do_group_exit+0x135/0x370 kernel/exit.c:979
__do_sys_exit_group kernel/exit.c:990 [inline]
__se_sys_exit_group kernel/exit.c:988 [inline]
__x64_sys_exit_group+0x44/0x50 kernel/exit.c:988
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
&(&ctx->ctx_lock)->rlock --> &ctx->fd_wqh --> &ctx->fault_pending_wqh

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&ctx->fault_pending_wqh);
local_irq_disable();
lock(&(&ctx->ctx_lock)->rlock);
lock(&ctx->fd_wqh);
<Interrupt>
lock(&(&ctx->ctx_lock)->rlock);

*** DEADLOCK ***

1 lock held by syz-executor.4/24529:
#0: 00000000a266ff4c (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq
include/linux/spinlock.h:354 [inline]
#0: 00000000a266ff4c (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll
fs/aio.c:1755 [inline]
#0: 00000000a266ff4c (&(&ctx->ctx_lock)->rlock){..-.}, at:
io_submit_one+0xd53/0x1b20 fs/aio.c:1859

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&(&ctx->ctx_lock)->rlock){..-.} ops: 156 {
IN-SOFTIRQ-W at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock_irq
include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x60/0x80
kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
free_ioctx_users+0x2d/0x4a0 fs/aio.c:604
percpu_ref_put_many include/linux/percpu-refcount.h:284
[inline]
percpu_ref_put include/linux/percpu-refcount.h:300
[inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123
[inline]
percpu_ref_switch_to_atomic_rcu+0x3e7/0x520
lib/percpu-refcount.c:158
__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2584 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
rcu_process_callbacks+0xba9/0x1a40
kernel/rcu/tree.c:2881
__do_softirq+0x266/0x92f kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x14a/0x570
arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20
arch/x86/entry/entry_64.S:867
arch_local_irq_disable
arch/x86/include/asm/paravirt.h:793 [inline]
arch_local_irq_save arch/x86/include/asm/paravirt.h:806
[inline]
lock_is_held_type+0xae/0x210
kernel/locking/lockdep.c:3937
lock_is_held include/linux/lockdep.h:344 [inline]
rcu_read_lock_held kernel/rcu/update.c:287 [inline]
rcu_read_lock_held+0xa3/0xd0 kernel/rcu/update.c:279
get_mem_cgroup_from_mm mm/memcontrol.c:850 [inline]
get_mem_cgroup_from_mm+0x247/0x2b0 mm/memcontrol.c:833
get_mem_cgroup_from_current mm/memcontrol.c:896 [inline]
memcg_kmem_charge+0x119/0x300 mm/memcontrol.c:2646
__alloc_pages_nodemask+0x3c6/0x760 mm/page_alloc.c:4413
alloc_pages_current+0x107/0x210 mm/mempolicy.c:2147
alloc_pages include/linux/gfp.h:509 [inline]
pipe_write+0xa65/0xfb0 fs/pipe.c:430
call_write_iter include/linux/fs.h:1811 [inline]
new_sync_write fs/read_write.c:474 [inline]
__vfs_write+0x58e/0x820 fs/read_write.c:487
vfs_write+0x20c/0x560 fs/read_write.c:549
ksys_write+0xea/0x1f0 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
INITIAL USE at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128
[inline]
_raw_spin_lock_irq+0x60/0x80
kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
free_ioctx_users+0x2d/0x4a0 fs/aio.c:604
percpu_ref_put_many include/linux/percpu-refcount.h:284
[inline]
percpu_ref_put include/linux/percpu-refcount.h:300
[inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123
[inline]
percpu_ref_switch_to_atomic_rcu+0x3e7/0x520
lib/percpu-refcount.c:158
__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2584 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
rcu_process_callbacks+0xba9/0x1a40 kernel/rcu/tree.c:2881
__do_softirq+0x266/0x92f kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x14a/0x570
arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20
arch/x86/entry/entry_64.S:867
arch_local_irq_disable
arch/x86/include/asm/paravirt.h:793 [inline]
arch_local_irq_save arch/x86/include/asm/paravirt.h:806
[inline]
lock_is_held_type+0xae/0x210
kernel/locking/lockdep.c:3937
lock_is_held include/linux/lockdep.h:344 [inline]
rcu_read_lock_held kernel/rcu/update.c:287 [inline]
rcu_read_lock_held+0xa3/0xd0 kernel/rcu/update.c:279
get_mem_cgroup_from_mm mm/memcontrol.c:850 [inline]
get_mem_cgroup_from_mm+0x247/0x2b0 mm/memcontrol.c:833
get_mem_cgroup_from_current mm/memcontrol.c:896 [inline]
memcg_kmem_charge+0x119/0x300 mm/memcontrol.c:2646
__alloc_pages_nodemask+0x3c6/0x760 mm/page_alloc.c:4413
alloc_pages_current+0x107/0x210 mm/mempolicy.c:2147
alloc_pages include/linux/gfp.h:509 [inline]
pipe_write+0xa65/0xfb0 fs/pipe.c:430
call_write_iter include/linux/fs.h:1811 [inline]
new_sync_write fs/read_write.c:474 [inline]
__vfs_write+0x58e/0x820 fs/read_write.c:487
vfs_write+0x20c/0x560 fs/read_write.c:549
ksys_write+0xea/0x1f0 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8a37f2e0>] __key.50192+0x0/0x40
... acquired at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
aio_poll fs/aio.c:1756 [inline]
io_submit_one+0xd7c/0x1b20 fs/aio.c:1859
__do_sys_io_submit fs/aio.c:1925 [inline]
__se_sys_io_submit fs/aio.c:1896 [inline]
__x64_sys_io_submit+0x1af/0x520 fs/aio.c:1896
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe

the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (&ctx->fault_pending_wqh){+.+.} ops: 3 {
HARDIRQ-ON-W at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock include/linux/spinlock_api_smp.h:142
[inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_release+0x497/0x6d0 fs/userfaultfd.c:917
__fput+0x2df/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x14a/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x933/0x2fa0 kernel/exit.c:876
do_group_exit+0x135/0x370 kernel/exit.c:979
__do_sys_exit_group kernel/exit.c:990 [inline]
__se_sys_exit_group kernel/exit.c:988 [inline]
__x64_sys_exit_group+0x44/0x50 kernel/exit.c:988
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
SOFTIRQ-ON-W at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock include/linux/spinlock_api_smp.h:142
[inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_release+0x497/0x6d0 fs/userfaultfd.c:917
__fput+0x2df/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x14a/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x933/0x2fa0 kernel/exit.c:876
do_group_exit+0x135/0x370 kernel/exit.c:979
__do_sys_exit_group kernel/exit.c:990 [inline]
__se_sys_exit_group kernel/exit.c:988 [inline]
__x64_sys_exit_group+0x44/0x50 kernel/exit.c:988
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
INITIAL USE at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock include/linux/spinlock_api_smp.h:142
[inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_ctx_read fs/userfaultfd.c:1041 [inline]
userfaultfd_read+0x394/0x18c0 fs/userfaultfd.c:1199
__vfs_read+0x116/0x800 fs/read_write.c:416
vfs_read+0x194/0x3d0 fs/read_write.c:452
ksys_read+0xea/0x1f0 fs/read_write.c:578
__do_sys_read fs/read_write.c:588 [inline]
__se_sys_read fs/read_write.c:586 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:586
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8a37f120>] __key.43728+0x0/0x40
... acquired at:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
userfaultfd_ctx_read fs/userfaultfd.c:1041 [inline]
userfaultfd_read+0x394/0x18c0 fs/userfaultfd.c:1199
__vfs_read+0x116/0x800 fs/read_write.c:416
vfs_read+0x194/0x3d0 fs/read_write.c:452
ksys_read+0xea/0x1f0 fs/read_write.c:578
__do_sys_read fs/read_write.c:588 [inline]
__se_sys_read fs/read_write.c:586 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:586
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> (&ctx->fd_wqh){....} ops: 5 {
INITIAL USE at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128
[inline]
_raw_spin_lock_irq+0x60/0x80
kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]
userfaultfd_ctx_read fs/userfaultfd.c:1037 [inline]
userfaultfd_read+0x262/0x18c0 fs/userfaultfd.c:1199
__vfs_read+0x116/0x800 fs/read_write.c:416
vfs_read+0x194/0x3d0 fs/read_write.c:452
ksys_read+0xea/0x1f0 fs/read_write.c:578
__do_sys_read fs/read_write.c:588 [inline]
__se_sys_read fs/read_write.c:586 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:586
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8a37f060>] __key.43731+0x0/0x40
... acquired at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
aio_poll fs/aio.c:1756 [inline]
io_submit_one+0xd7c/0x1b20 fs/aio.c:1859
__do_sys_io_submit fs/aio.c:1925 [inline]
__se_sys_io_submit fs/aio.c:1896 [inline]
__x64_sys_io_submit+0x1af/0x520 fs/aio.c:1896
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe

stack backtrace:
CPU: 0 PID: 24529 Comm: syz-executor.4 Not tainted 4.19.34 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_bad_irq_dependency kernel/locking/lockdep.c:1568 [inline]
check_usage.cold+0x611/0x946 kernel/locking/lockdep.c:1600
check_irq_usage kernel/locking/lockdep.c:1656 [inline]
check_prev_add_irq kernel/locking/lockdep_states.h:8 [inline]
check_prev_add kernel/locking/lockdep.c:1866 [inline]
check_prevs_add kernel/locking/lockdep.c:1974 [inline]
validate_chain kernel/locking/lockdep.c:2415 [inline]
__lock_acquire+0x1ee4/0x48f0 kernel/locking/lockdep.c:3411
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
aio_poll fs/aio.c:1756 [inline]
io_submit_one+0xd7c/0x1b20 fs/aio.c:1859
__do_sys_io_submit fs/aio.c:1925 [inline]
__se_sys_io_submit fs/aio.c:1896 [inline]
__x64_sys_io_submit+0x1af/0x520 fs/aio.c:1896
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4582f9
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f803ccc0c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004582f9
RDX: 0000000020000600 RSI: 0000000000000001 RDI: 00007f803cca0000
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f803ccc16d4
R13: 00000000004bf460 R14: 00000000004d11e8 R15: 00000000ffffffff
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: '_h' (0000000001fbe6c9): kobject_add_internal: parent: 'gfs2',
set: 'gfs2'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h' (0000000001fbe6c9): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: '_h' (0000000001fbe6c9): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
gfs2: fsid=_h: Trying to join cluster "lock_nolock", "_h"
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
gfs2: fsid=_h: Now mounting FS...
gfs2: not a GFS2 filesystem
gfs2: fsid=_h: can't read superblock
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
gfs2: fsid=_h: can't read superblock: -22
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: '_h' (0000000001fbe6c9): kobject_cleanup, parent 000000006461ba2d
kobject: '_h' (0000000001fbe6c9): auto cleanup 'remove' event
kobject: '_h' (0000000001fbe6c9): kobject_uevent_env
kobject: '_h' (0000000001fbe6c9): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: '_h' (0000000001fbe6c9): auto cleanup kobject_del
kobject: '_h' (0000000001fbe6c9): calling ktype release
kobject: '_h': free name
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: '_h' (00000000498b3376): kobject_add_internal: parent: 'gfs2',
set: 'gfs2'
kobject: '_h' (00000000498b3376): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: '_h' (00000000498b3376): fill_kobj_path: path = '/fs/gfs2/_h'
gfs2: fsid=_h: Trying to join cluster "lock_nolock", "_h"
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
gfs2: fsid=_h: Now mounting FS...
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
gfs2: not a GFS2 filesystem
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
gfs2: fsid=_h: can't read superblock
gfs2: fsid=_h: can't read superblock: -22
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: '_h' (00000000498b3376): kobject_cleanup, parent 000000006461ba2d
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h' (00000000498b3376): auto cleanup 'remove' event
kobject: '_h' (00000000498b3376): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: '_h' (00000000498b3376): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: '_h' (00000000498b3376): auto cleanup kobject_del
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: '_h' (00000000498b3376): calling ktype release
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h': free name
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: '_h' (000000001254974c): kobject_add_internal: parent: 'gfs2',
set: 'gfs2'
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: '_h' (000000001254974c): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h' (000000001254974c): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
gfs2: fsid=_h: Trying to join cluster "lock_nolock", "_h"
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
gfs2: fsid=_h: Now mounting FS...
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
gfs2: not a GFS2 filesystem
gfs2: fsid=_h: can't read superblock
gfs2: not a GFS2 filesystem
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
gfs2: fsid=_h: can't read superblock: -22
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: '_h' (000000001254974c): kobject_cleanup, parent 000000006461ba2d
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: '_h' (000000001254974c): auto cleanup 'remove' event
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: '_h' (000000001254974c): kobject_uevent_env
kobject: '_h' (000000001254974c): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h' (000000001254974c): auto cleanup kobject_del
kobject: '_h' (000000001254974c): calling ktype release
kobject: '_h': free name
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
gfs2: not a GFS2 filesystem
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: '_h' (00000000a5e58850): kobject_add_internal: parent: 'gfs2',
set: 'gfs2'
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: '_h' (00000000a5e58850): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: '_h' (00000000a5e58850): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
gfs2: fsid=_h: Trying to join cluster "lock_nolock", "_h"
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
gfs2: fsid=_h: Now mounting FS...
gfs2: not a GFS2 filesystem
gfs2: not a GFS2 filesystem
gfs2: fsid=_h: can't read superblock
gfs2: fsid=_h: can't read superblock: -22
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: '_h' (00000000a5e58850): kobject_cleanup, parent 000000006461ba2d
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h' (00000000a5e58850): auto cleanup 'remove' event
kobject: '_h' (00000000a5e58850): kobject_uevent_env
kobject: '_h' (00000000a5e58850): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: '_h' (00000000a5e58850): auto cleanup kobject_del
kobject: '_h' (00000000a5e58850): calling ktype release
kobject: '_h': free name
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
gfs2: invalid mount option: dont_measure
gfs2: can't parse mount arguments
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: '_h' (0000000018d6cabd): kobject_add_internal: parent: 'gfs2',
set: 'gfs2'
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: '_h' (0000000018d6cabd): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: '_h' (0000000018d6cabd): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
gfs2: fsid=_h: Trying to join cluster "lock_nolock", "_h"
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
gfs2: fsid=_h: Now mounting FS...
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
gfs2: not a GFS2 filesystem
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
gfs2: fsid=_h: can't read superblock
gfs2: invalid mount option: dont_measure
gfs2: fsid=_h: can't read superblock: -22
gfs2: can't parse mount arguments
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: '_h' (0000000018d6cabd): kobject_cleanup, parent 000000006461ba2d
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: '_h' (0000000018d6cabd): auto cleanup 'remove' event
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: '_h' (0000000018d6cabd): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: '_h' (0000000018d6cabd): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h' (0000000018d6cabd): auto cleanup kobject_del
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: '_h' (0000000018d6cabd): calling ktype release
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: '_h': free name
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
gfs2: invalid mount option: dont_measure
gfs2: can't parse mount arguments
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'tun0' (00000000dc86df18): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'tun0' (00000000dc86df18): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'tun0' (00000000dc86df18): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'queues' (0000000039765bbc): kobject_add_internal: parent: 'tun0',
set: '<NULL>'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'queues' (0000000039765bbc): kobject_uevent_env
kobject: 'queues' (0000000039765bbc): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'rx-0' (00000000bb954cea): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'rx-0' (00000000bb954cea): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'rx-0' (00000000bb954cea): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: '_h' (000000009914fd7c): kobject_add_internal: parent: 'gfs2',
set: 'gfs2'
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'tx-0' (00000000c4d355f2): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: '_h' (000000009914fd7c): kobject_uevent_env
kobject: 'tx-0' (00000000c4d355f2): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'tx-0' (00000000c4d355f2): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: '_h' (000000009914fd7c): fill_kobj_path: path = '/fs/gfs2/_h'
gfs2: fsid=_h: Trying to join cluster "lock_nolock", "_h"
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
gfs2: fsid=_h: Now mounting FS...
gfs2: not a GFS2 filesystem
gfs2: fsid=_h: can't read superblock
gfs2: fsid=_h: can't read superblock: -22
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h' (000000009914fd7c): kobject_cleanup, parent 000000006461ba2d
kobject: '_h' (000000009914fd7c): auto cleanup 'remove' event
kobject: 'rx-0' (00000000bb954cea): kobject_cleanup, parent 0000000039765bbc
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'rx-0' (00000000bb954cea): auto cleanup 'remove' event
kobject: '_h' (000000009914fd7c): kobject_uevent_env
kobject: 'rx-0' (00000000bb954cea): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
gfs2: not a GFS2 filesystem
kobject: '_h' (000000009914fd7c): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'rx-0' (00000000bb954cea): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: '_h' (000000009914fd7c): auto cleanup kobject_del
kobject: 'rx-0' (00000000bb954cea): auto cleanup kobject_del
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'rx-0' (00000000bb954cea): calling ktype release
kobject: '_h' (000000009914fd7c): calling ktype release
kobject: 'rx-0': free name
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'tx-0' (00000000c4d355f2): kobject_cleanup, parent 0000000039765bbc
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'tx-0' (00000000c4d355f2): auto cleanup 'remove' event
kobject: '_h': free name
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'tx-0' (00000000c4d355f2): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'tx-0' (00000000c4d355f2): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'tx-0' (00000000c4d355f2): auto cleanup kobject_del
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'tx-0' (00000000c4d355f2): calling ktype release
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'tx-0': free name
kobject: 'queues' (0000000039765bbc): kobject_cleanup, parent
(null)
kobject: 'queues' (0000000039765bbc): calling ktype release
kobject: 'queues' (0000000039765bbc): kset_release
kobject: 'queues': free name
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'tun0' (00000000dc86df18): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'tun0' (00000000dc86df18): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
gfs2: not a GFS2 filesystem
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'tun0' (00000000dc86df18): kobject_cleanup, parent (null)
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'tun0' (00000000dc86df18): calling ktype release
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'tun0': free name
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: '_h' (00000000d5596335): kobject_add_internal: parent: 'gfs2',
set: 'gfs2'
kobject: '_h' (00000000d5596335): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'tun0' (00000000deaf2a5d): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: '_h' (00000000d5596335): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
gfs2: fsid=_h: Trying to join cluster "lock_nolock", "_h"
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'tun0' (00000000deaf2a5d): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
gfs2: fsid=_h: Now mounting FS...
kobject: 'tun0' (00000000deaf2a5d): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
gfs2: not a GFS2 filesystem
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
gfs2: fsid=_h: can't read superblock
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
gfs2: fsid=_h: can't read superblock: -22
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'queues' (00000000808eede5): kobject_add_internal: parent: 'tun0',
set: '<NULL>'
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h' (00000000d5596335): kobject_cleanup, parent 000000006461ba2d
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: '_h' (00000000d5596335): auto cleanup 'remove' event
kobject: '_h' (00000000d5596335): kobject_uevent_env
kobject: 'queues' (00000000808eede5): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: '_h' (00000000d5596335): fill_kobj_path: path = '/fs/gfs2/_h'
gfs2: not a GFS2 filesystem
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'queues' (00000000808eede5): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: '_h' (00000000d5596335): auto cleanup kobject_del
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: '_h' (00000000d5596335): calling ktype release
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'rx-0' (000000001ed21fcc): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: '_h': free name
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'rx-0' (000000001ed21fcc): kobject_uevent_env
kobject: 'rx-0' (000000001ed21fcc): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'tx-0' (000000006542f465): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (000000006542f465): kobject_uevent_env
kobject: 'tx-0' (000000006542f465): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'rx-0' (000000001ed21fcc): kobject_cleanup, parent 00000000808eede5
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'rx-0' (000000001ed21fcc): auto cleanup 'remove' event
kobject: 'rx-0' (000000001ed21fcc): kobject_uevent_env
kobject: 'rx-0' (000000001ed21fcc): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'rx-0' (000000001ed21fcc): auto cleanup kobject_del
kobject: 'rx-0' (000000001ed21fcc): calling ktype release
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'rx-0': free name
kobject: 'tx-0' (000000006542f465): kobject_cleanup, parent 00000000808eede5
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'tx-0' (000000006542f465): auto cleanup 'remove' event
kobject: '_h' (00000000be8741f5): kobject_add_internal: parent: 'gfs2',
set: 'gfs2'
kobject: 'tx-0' (000000006542f465): kobject_uevent_env
kobject: 'tx-0' (000000006542f465): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: '_h' (00000000be8741f5): kobject_uevent_env
kobject: 'tx-0' (000000006542f465): auto cleanup kobject_del
kobject: '_h' (00000000be8741f5): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
gfs2: fsid=_h: Trying to join cluster "lock_nolock", "_h"
kobject: 'tx-0' (000000006542f465): calling ktype release
kobject: 'tx-0': free name
gfs2: fsid=_h: Now mounting FS...
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
gfs2: not a GFS2 filesystem
kobject: 'queues' (00000000808eede5): kobject_cleanup, parent
(null)
gfs2: fsid=_h: can't read superblock
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
gfs2: fsid=_h: can't read superblock: -22
kobject: 'queues' (00000000808eede5): calling ktype release
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'queues' (00000000808eede5): kset_release
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: '_h' (00000000be8741f5): kobject_cleanup, parent 000000006461ba2d
kobject: 'queues': free name
kobject: '_h' (00000000be8741f5): auto cleanup 'remove' event
kobject: 'tun0' (00000000deaf2a5d): kobject_uevent_env
kobject: '_h' (00000000be8741f5): kobject_uevent_env
kobject: 'tun0' (00000000deaf2a5d): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: '_h' (00000000be8741f5): fill_kobj_path: path = '/fs/gfs2/_h'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: '_h' (00000000be8741f5): auto cleanup kobject_del
kobject: 'tun0' (00000000deaf2a5d): kobject_cleanup, parent (null)
kobject: '_h' (00000000be8741f5): calling ktype release
kobject: '_h': free name
kobject: 'tun0' (00000000deaf2a5d): calling ktype release
kobject: 'tun0': free name
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'tun0' (00000000183b61cd): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'tun0' (00000000183b61cd): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'tun0' (00000000183b61cd): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'queues' (0000000088b6b5aa): kobject_add_internal: parent: 'tun0',
set: '<NULL>'
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'queues' (0000000088b6b5aa): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'queues' (0000000088b6b5aa): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'rx-0' (0000000074e93ebd): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (0000000074e93ebd): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'rx-0' (0000000074e93ebd): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'tx-0' (00000000d7e77a36): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'tx-0' (00000000d7e77a36): kobject_uevent_env
kobject: 'tx-0' (00000000d7e77a36): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'rx-0' (0000000074e93ebd): kobject_cleanup, parent 0000000088b6b5aa
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'rx-0' (0000000074e93ebd): auto cleanup 'remove' event
kobject: 'rx-0' (0000000074e93ebd): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'rx-0' (0000000074e93ebd): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'rx-0' (0000000074e93ebd): auto cleanup kobject_del
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'rx-0' (0000000074e93ebd): calling ktype release
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'rx-0': free name
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'tx-0' (00000000d7e77a36): kobject_cleanup, parent 0000000088b6b5aa
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'tx-0' (00000000d7e77a36): auto cleanup 'remove' event
kobject: 'tx-0' (00000000d7e77a36): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'tx-0' (00000000d7e77a36): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'tx-0' (00000000d7e77a36): auto cleanup kobject_del
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'tx-0' (00000000d7e77a36): calling ktype release
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'tx-0': free name
kobject: 'queues' (0000000088b6b5aa): kobject_cleanup, parent
(null)
kobject: 'queues' (0000000088b6b5aa): calling ktype release
kobject: 'queues' (0000000088b6b5aa): kset_release
kobject: 'queues': free name
kobject: 'tun0' (00000000183b61cd): kobject_uevent_env
kobject: 'tun0' (00000000183b61cd): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: 'tun0' (00000000183b61cd): kobject_cleanup, parent (null)
kobject: 'tun0' (00000000183b61cd): calling ktype release
kobject: 'tun0': free name
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'tun0' (0000000049ba6b25): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'tun0' (0000000049ba6b25): kobject_uevent_env
kobject: 'tun0' (0000000049ba6b25): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: 'queues' (00000000c4c0110d): kobject_add_internal: parent: 'tun0',
set: '<NULL>'
kobject: 'queues' (00000000c4c0110d): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'queues' (00000000c4c0110d): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (00000000d98b921e): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'rx-0' (00000000d98b921e): kobject_uevent_env
kobject: 'rx-0' (00000000d98b921e): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'tx-0' (00000000bcf6df76): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (00000000bcf6df76): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'tx-0' (00000000bcf6df76): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'rx-0' (00000000d98b921e): kobject_cleanup, parent 00000000c4c0110d
kobject: 'rx-0' (00000000d98b921e): auto cleanup 'remove' event
kobject: 'rx-0' (00000000d98b921e): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'rx-0' (00000000d98b921e): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'rx-0' (00000000d98b921e): auto cleanup kobject_del
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'rx-0' (00000000d98b921e): calling ktype release
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'rx-0': free name
kobject: 'tx-0' (00000000bcf6df76): kobject_cleanup, parent 00000000c4c0110d
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'tx-0' (00000000bcf6df76): auto cleanup 'remove' event
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'tx-0' (00000000bcf6df76): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'tx-0' (00000000bcf6df76): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'tx-0' (00000000bcf6df76): auto cleanup kobject_del
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'tx-0' (00000000bcf6df76): calling ktype release
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'tx-0': free name
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'queues' (00000000c4c0110d): kobject_cleanup, parent
(null)
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'queues' (00000000c4c0110d): calling ktype release
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'queues' (00000000c4c0110d): kset_release
kobject: 'queues': free name
kobject: 'tun0' (0000000049ba6b25): kobject_uevent_env
kobject: 'tun0' (0000000049ba6b25): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: 'tun0' (0000000049ba6b25): kobject_cleanup, parent (null)
kobject: 'tun0' (0000000049ba6b25): calling ktype release
kobject: 'tun0': free name
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'tun0' (00000000136012cc): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'tun0' (00000000136012cc): kobject_uevent_env
kobject: 'tun0' (00000000136012cc): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'queues' (00000000753f64d5): kobject_add_internal: parent: 'tun0',
set: '<NULL>'
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'queues' (00000000753f64d5): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'queues' (00000000753f64d5): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'rx-0' (00000000b11bb310): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'rx-0' (00000000b11bb310): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'rx-0' (00000000b11bb310): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'tx-0' (00000000dcb13bf5): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (00000000dcb13bf5): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'tx-0' (00000000dcb13bf5): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
gfs2: not a GFS2 filesystem
kobject: 'rx-0' (00000000b11bb310): kobject_cleanup, parent 00000000753f64d5
kobject: 'rx-0' (00000000b11bb310): auto cleanup 'remove' event
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'rx-0' (00000000b11bb310): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'rx-0' (00000000b11bb310): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'rx-0' (00000000b11bb310): auto cleanup kobject_del
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'rx-0' (00000000b11bb310): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (00000000dcb13bf5): kobject_cleanup, parent 00000000753f64d5
kobject: 'tx-0' (00000000dcb13bf5): auto cleanup 'remove' event
kobject: 'tx-0' (00000000dcb13bf5): kobject_uevent_env
kobject: 'tx-0' (00000000dcb13bf5): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'tx-0' (00000000dcb13bf5): auto cleanup kobject_del
kobject: 'tx-0' (00000000dcb13bf5): calling ktype release
kobject: 'tx-0': free name
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'queues' (00000000753f64d5): kobject_cleanup, parent
(null)
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'queues' (00000000753f64d5): calling ktype release
kobject: 'queues' (00000000753f64d5): kset_release
kobject: 'queues': free name
kobject: 'tun0' (00000000136012cc): kobject_uevent_env
kobject: 'tun0' (00000000136012cc): fill_kobj_path: path
= '/devices/virtual/net/tun0'
kobject: 'tun0' (00000000136012cc): kobject_cleanup, parent (null)
kobject: 'tun0' (00000000136012cc): calling ktype release
kobject: 'tun0': free name
kobject: 'loop5' (00000000a5376603): kobject_uevent_env
kobject: 'loop5' (00000000a5376603): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'tun0' (000000007251414a): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'tun0' (000000007251414a): kobject_uevent_env
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'tun0' (000000007251414a): fill_kobj_path: path
= '/devices/virtual/net/tun0'
gfs2: not a GFS2 filesystem
kobject: 'queues' (00000000c0e11f3d): kobject_add_internal: parent: 'tun0',
set: '<NULL>'
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'queues' (00000000c0e11f3d): kobject_uevent_env
kobject: 'loop2' (00000000a5322947): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (00000000a5322947): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'queues' (00000000c0e11f3d): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'rx-0' (00000000194b73c3): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000035f7d2a2): kobject_uevent_env
kobject: 'rx-0' (00000000194b73c3): kobject_uevent_env
kobject: 'loop0' (0000000035f7d2a2): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop3' (00000000f2bc0bfc): kobject_uevent_env
kobject: 'rx-0' (00000000194b73c3): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'loop3' (00000000f2bc0bfc): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'tx-0' (0000000096d10513): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (0000000096d10513): kobject_uevent_env
kobject: 'loop1' (00000000ac6a2fa2): kobject_uevent_env
kobject: 'tx-0' (0000000096d10513): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/tx-0'
kobject: 'loop1' (00000000ac6a2fa2): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'rx-0' (00000000194b73c3): kobject_cleanup, parent 00000000c0e11f3d
kobject: 'rx-0' (00000000194b73c3): auto cleanup 'remove' event
kobject: 'loop4' (00000000cff47c88): kobject_uevent_env
kobject: 'rx-0' (00000000194b73c3): kobject_uevent_env
kobject: 'rx-0' (00000000194b73c3): fill_kobj_path: path
= '/devices/virtual/net/tun0/queues/rx-0'
kobject: 'loop4' (00000000cff47c88): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'rx-0' (00000000194b73c3): auto cleanup kob

---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

syzbot

unread,

Jun 10, 2019, 12:35:07 AM6/10/19

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following crash on:

HEAD commit: bb7b450e Linux 4.19.49
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15d6e392a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d7b3d7d5be080e97

dashboard link: https://syzkaller.appspot.com/bug?extid=a382f9fc143e31d6afb6
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14913446a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a382f9...@syzkaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
audit: type=1400 audit(1560141018.506:38): avc: denied { associate } for
pid=7737 comm="syz-executor.0" name="syz0"
scontext=unconfined_u:object_r:unlabeled_t:s0
tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected

4.19.49 #21 Not tainted
-----------------------------------------------------
syz-executor.0/7825 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
000000007bb2b707 (&ctx->fd_wqh){....}, at: spin_lock
include/linux/spinlock.h:329 [inline]
000000007bb2b707 (&ctx->fd_wqh){....}, at: aio_poll fs/aio.c:1741 [inline]
000000007bb2b707 (&ctx->fd_wqh){....}, at: __io_submit_one fs/aio.c:1849
[inline]
000000007bb2b707 (&ctx->fd_wqh){....}, at: io_submit_one+0xef2/0x2eb0
fs/aio.c:1885

and this task is already holding:

00000000e10ef4d2 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq
include/linux/spinlock.h:354 [inline]
00000000e10ef4d2 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll
fs/aio.c:1739 [inline]
00000000e10ef4d2 (&(&ctx->ctx_lock)->rlock){..-.}, at: __io_submit_one
fs/aio.c:1849 [inline]
00000000e10ef4d2 (&(&ctx->ctx_lock)->rlock){..-.}, at:
io_submit_one+0xead/0x2eb0 fs/aio.c:1885

which would create a new lock dependency:
(&(&ctx->ctx_lock)->rlock){..-.} -> (&ctx->fd_wqh){....}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(&(&ctx->ctx_lock)->rlock){..-.}

... which became SOFTIRQ-irq-safe at:

lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x60/0x80 kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]

free_ioctx_users+0x2d/0x490 fs/aio.c:614

percpu_ref_put_many include/linux/percpu-refcount.h:284 [inline]
percpu_ref_put include/linux/percpu-refcount.h:300 [inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123 [inline]

percpu_ref_switch_to_atomic_rcu+0x407/0x540 lib/percpu-refcount.c:158

__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2584 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]

rcu_process_callbacks+0xba0/0x1a30 kernel/rcu/tree.c:2881
__do_softirq+0x25c/0x921 kernel/softirq.c:292

invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]

smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:869
native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:556
default_idle_call+0x36/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x377/0x560 kernel/sched/idle.c:262
cpu_startup_entry+0xc8/0xe0 kernel/sched/idle.c:368
rest_init+0xf1/0xf6 init/main.c:442
start_kernel+0x88c/0x8c5 init/main.c:738
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

to a SOFTIRQ-irq-unsafe lock:
(&ctx->fault_pending_wqh){+.+.}

... which became SOFTIRQ-irq-unsafe at:
...

lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]

userfaultfd_release+0x4d6/0x720 fs/userfaultfd.c:922
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
get_signal+0x1baa/0x1fc0 kernel/signal.c:2385
do_signal+0x95/0x1960 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296

entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
&(&ctx->ctx_lock)->rlock --> &ctx->fd_wqh --> &ctx->fault_pending_wqh

Possible interrupt unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&ctx->fault_pending_wqh);
local_irq_disable();
lock(&(&ctx->ctx_lock)->rlock);
lock(&ctx->fd_wqh);
<Interrupt>
lock(&(&ctx->ctx_lock)->rlock);

*** DEADLOCK ***

1 lock held by syz-executor.0/7825:
#0: 00000000e10ef4d2 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq
include/linux/spinlock.h:354 [inline]
#0: 00000000e10ef4d2 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll
fs/aio.c:1739 [inline]
#0: 00000000e10ef4d2 (&(&ctx->ctx_lock)->rlock){..-.}, at: __io_submit_one
fs/aio.c:1849 [inline]
#0: 00000000e10ef4d2 (&(&ctx->ctx_lock)->rlock){..-.}, at:
io_submit_one+0xead/0x2eb0 fs/aio.c:1885

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:

-> (&(&ctx->ctx_lock)->rlock){..-.} ops: 17 {
IN-SOFTIRQ-W at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock_irq
include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x60/0x80
kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]

free_ioctx_users+0x2d/0x490 fs/aio.c:614

percpu_ref_put_many include/linux/percpu-refcount.h:284
[inline]
percpu_ref_put include/linux/percpu-refcount.h:300
[inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123
[inline]

percpu_ref_switch_to_atomic_rcu+0x407/0x540

lib/percpu-refcount.c:158
__rcu_reclaim kernel/rcu/rcu.h:236 [inline]
rcu_do_batch kernel/rcu/tree.c:2584 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]

rcu_process_callbacks+0xba0/0x1a30
kernel/rcu/tree.c:2881
__do_softirq+0x25c/0x921 kernel/softirq.c:292

invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]

smp_apic_timer_interrupt+0x13b/0x550
arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20
arch/x86/entry/entry_64.S:869
native_safe_halt+0xe/0x10
arch/x86/include/asm/irqflags.h:60
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:556
default_idle_call+0x36/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x377/0x560 kernel/sched/idle.c:262
cpu_startup_entry+0xc8/0xe0 kernel/sched/idle.c:368
rest_init+0xf1/0xf6 init/main.c:442
start_kernel+0x88c/0x8c5 init/main.c:738
x86_64_start_reservations+0x29/0x2b
arch/x86/kernel/head64.c:470
x86_64_start_kernel+0x77/0x7b
arch/x86/kernel/head64.c:451
secondary_startup_64+0xa4/0xb0
arch/x86/kernel/head_64.S:243
INITIAL USE at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128
[inline]
_raw_spin_lock_irq+0x60/0x80
kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]

free_ioctx_users+0x2d/0x490 fs/aio.c:614

percpu_ref_put_many include/linux/percpu-refcount.h:284
[inline]
percpu_ref_put include/linux/percpu-refcount.h:300
[inline]
percpu_ref_call_confirm_rcu lib/percpu-refcount.c:123
[inline]

percpu_ref_switch_to_atomic_rcu+0x407/0x540

rcu_process_callbacks+0xba0/0x1a30 kernel/rcu/tree.c:2881
__do_softirq+0x25c/0x921 kernel/softirq.c:292

invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]

smp_apic_timer_interrupt+0x13b/0x550
arch/x86/kernel/apic/apic.c:1056
apic_timer_interrupt+0xf/0x20
arch/x86/entry/entry_64.S:869
native_safe_halt+0xe/0x10
arch/x86/include/asm/irqflags.h:60
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:556
default_idle_call+0x36/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x377/0x560 kernel/sched/idle.c:262
cpu_startup_entry+0xc8/0xe0 kernel/sched/idle.c:368
rest_init+0xf1/0xf6 init/main.c:442
start_kernel+0x88c/0x8c5 init/main.c:738
x86_64_start_reservations+0x29/0x2b
arch/x86/kernel/head64.c:470
x86_64_start_kernel+0x77/0x7b
arch/x86/kernel/head64.c:451
secondary_startup_64+0xa4/0xb0
arch/x86/kernel/head_64.S:243
}
... key at: [<ffffffff8a3813a0>] __key.50188+0x0/0x40
... acquired at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]

entry_SYSCALL_64_after_hwframe+0x49/0xbe

the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:

-> (&ctx->fault_pending_wqh){+.+.} ops: 98 {
HARDIRQ-ON-W at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock include/linux/spinlock_api_smp.h:142
[inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]

userfaultfd_release+0x4d6/0x720 fs/userfaultfd.c:922
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
get_signal+0x1baa/0x1fc0 kernel/signal.c:2385
do_signal+0x95/0x1960 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x244/0x2c0
arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198
[inline]
syscall_return_slowpath arch/x86/entry/common.c:271
[inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
SOFTIRQ-ON-W at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock include/linux/spinlock_api_smp.h:142
[inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]

userfaultfd_release+0x4d6/0x720 fs/userfaultfd.c:922
__fput+0x2dd/0x8b0 fs/file_table.c:278
____fput+0x16/0x20 fs/file_table.c:309
task_work_run+0x145/0x1c0 kernel/task_work.c:113
get_signal+0x1baa/0x1fc0 kernel/signal.c:2385
do_signal+0x95/0x1960 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x244/0x2c0
arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198
[inline]
syscall_return_slowpath arch/x86/entry/common.c:271
[inline]
do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
INITIAL USE at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock include/linux/spinlock_api_smp.h:142
[inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]

userfaultfd_ctx_read fs/userfaultfd.c:1046 [inline]
userfaultfd_read+0x394/0x18c0 fs/userfaultfd.c:1204
__vfs_read+0x114/0x800 fs/read_write.c:416
vfs_read+0x194/0x3d0 fs/read_write.c:452
ksys_read+0x14f/0x2d0 fs/read_write.c:579
__do_sys_read fs/read_write.c:589 [inline]
__se_sys_read fs/read_write.c:587 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:587
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8a3811e0>] __key.43722+0x0/0x40

... acquired at:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]

userfaultfd_ctx_read fs/userfaultfd.c:1046 [inline]
userfaultfd_read+0x394/0x18c0 fs/userfaultfd.c:1204
__vfs_read+0x114/0x800 fs/read_write.c:416
vfs_read+0x194/0x3d0 fs/read_write.c:452
ksys_read+0x14f/0x2d0 fs/read_write.c:579
__do_sys_read fs/read_write.c:589 [inline]
__se_sys_read fs/read_write.c:587 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:587
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> (&ctx->fd_wqh){....} ops: 100 {
INITIAL USE at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128
[inline]
_raw_spin_lock_irq+0x60/0x80
kernel/locking/spinlock.c:160
spin_lock_irq include/linux/spinlock.h:354 [inline]

userfaultfd_ctx_read fs/userfaultfd.c:1042 [inline]
userfaultfd_read+0x262/0x18c0 fs/userfaultfd.c:1204
__vfs_read+0x114/0x800 fs/read_write.c:416
vfs_read+0x194/0x3d0 fs/read_write.c:452
ksys_read+0x14f/0x2d0 fs/read_write.c:579
__do_sys_read fs/read_write.c:589 [inline]
__se_sys_read fs/read_write.c:587 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:587
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
}
... key at: [<ffffffff8a381120>] __key.43725+0x0/0x40
... acquired at:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]

aio_poll fs/aio.c:1741 [inline]
__io_submit_one fs/aio.c:1849 [inline]
io_submit_one+0xef2/0x2eb0 fs/aio.c:1885
__do_sys_io_submit fs/aio.c:1929 [inline]
__se_sys_io_submit fs/aio.c:1900 [inline]
__x64_sys_io_submit+0x1aa/0x520 fs/aio.c:1900
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe

stack backtrace:
CPU: 0 PID: 7825 Comm: syz-executor.0 Not tainted 4.19.49 #21

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_bad_irq_dependency kernel/locking/lockdep.c:1568 [inline]
check_usage.cold+0x611/0x946 kernel/locking/lockdep.c:1600
check_irq_usage kernel/locking/lockdep.c:1656 [inline]
check_prev_add_irq kernel/locking/lockdep_states.h:8 [inline]
check_prev_add kernel/locking/lockdep.c:1866 [inline]
check_prevs_add kernel/locking/lockdep.c:1974 [inline]
validate_chain kernel/locking/lockdep.c:2415 [inline]
__lock_acquire+0x1ee4/0x48f0 kernel/locking/lockdep.c:3411

lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900

__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]

aio_poll fs/aio.c:1741 [inline]
__io_submit_one fs/aio.c:1849 [inline]
io_submit_one+0xef2/0x2eb0 fs/aio.c:1885
__do_sys_io_submit fs/aio.c:1929 [inline]
__se_sys_io_submit fs/aio.c:1900 [inline]
__x64_sys_io_submit+0x1aa/0x520 fs/aio.c:1900
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459279
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7

48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff

ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f40d2400c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279
RDX: 0000000020000600 RSI: 0000000000000001 RDI: 00007f40d2402000
RBP: 000000000075bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f40d24016d4
R13: 00000000004c05dd R14: 00000000004d2f88 R15: 00000000ffffffff
kobject: 'loop0' (000000004bf9af88): kobject_uevent_env
kobject: 'loop0' (000000004bf9af88): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop0' (000000004bf9af88): kobject_uevent_env
kobject: 'loop0' (000000004bf9af88): fill_kobj_path: path
= '/devices/virtual/block/loop0'

syzbot

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Dec 17, 2019, 1:11:02 AM12/17/19

to syzkaller...@googlegroups.com

syzbot suspects this bug was fixed by commit:

commit 052b318100856aa86f4e0c03cfe43a1bb6bfb487
Author: Eric Biggers <ebig...@google.com>
Date: Thu Jul 4 22:14:39 2019 +0000

fs/userfaultfd.c: disable irqs for fault_pending and event locks

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1487a151e00000
start commit: 1a059243 Linux 4.19.57
git tree: linux-4.19.y
kernel config: https://syzkaller.appspot.com/x/.config?x=b58593e59ea16f2f
dashboard link: https://syzkaller.appspot.com/bug?extid=a382f9fc143e31d6afb6
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13a0f743a00000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: fs/userfaultfd.c: disable irqs for fault_pending and event locks

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Eric Biggers

unread,

Dec 17, 2019, 11:58:47 AM12/17/19

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