possible deadlock in perf_event_read_value

9 views

Skip to first unread message

syzbot

unread,

Apr 18, 2019, 12:03:08 PM4/18/19

to syzkaller...@googlegroups.com

Hello,

syzbot found the following crash on:

HEAD commit: 58b454eb Linux 4.14.112
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=122af7fd200000
kernel config: https://syzkaller.appspot.com/x/.config?x=8b0e7ab7678533ab
dashboard link: https://syzkaller.appspot.com/bug?extid=55050b0f87558b5401b7
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+55050b...@syzkaller.appspotmail.com

======================================================
WARNING: possible circular locking dependency detected
4.14.112 #2 Not tainted
------------------------------------------------------
syz-executor.3/11179 is trying to acquire lock:
(&event->child_mutex){+.+.}, at: [<ffffffff816bcc2a>]
perf_event_read_value+0x7a/0x410 kernel/events/core.c:4447

but task is already holding lock:
(&cpuctx_mutex){+.+.}, at: [<ffffffff816bafd0>]
perf_event_ctx_lock_nested+0x150/0x2c0 kernel/events/core.c:1235

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #5 (&cpuctx_mutex){+.+.}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_init_cpu+0xc2/0x170 kernel/events/core.c:11221
perf_event_init+0x2d8/0x31a kernel/events/core.c:11268
start_kernel+0x3b9/0x700 init/main.c:621
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:380
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:361
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env

-> #4 (pmus_lock){+.+.}:
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_init_cpu+0x2f/0x170 kernel/events/core.c:11215
cpuhp_invoke_callback+0x1ec/0x1ac0 kernel/cpu.c:184
cpuhp_up_callbacks kernel/cpu.c:572 [inline]
_cpu_up+0x228/0x530 kernel/cpu.c:1134
do_cpu_up+0x121/0x150 kernel/cpu.c:1169
cpu_up+0x1b/0x20 kernel/cpu.c:1177
smp_init+0x157/0x173 kernel/smp.c:578
kernel_init_freeable+0x30e/0x538 init/main.c:1067
kernel_init+0x12/0x162 init/main.c:999
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402

-> #3 (cpu_hotplug_lock.rw_sem){++++}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36
[inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
cpus_read_lock+0x3d/0xc0 kernel/cpu.c:295
static_key_slow_inc+0x13/0x30 kernel/jump_label.c:123
tracepoint_add_func kernel/tracepoint.c:223 [inline]
tracepoint_probe_register_prio+0x4dc/0x6d0 kernel/tracepoint.c:283
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304
trace_event_reg+0x277/0x330 kernel/trace/trace_events.c:305
perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]
perf_trace_init+0x450/0xaa0 kernel/trace/trace_event_perf.c:221
perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8104
perf_try_init_event+0x170/0x210 kernel/events/core.c:9340
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
perf_init_event kernel/events/core.c:9378 [inline]
perf_event_alloc.part.0+0xd48/0x2540 kernel/events/core.c:9638
perf_event_alloc kernel/events/core.c:9991 [inline]
SYSC_perf_event_open+0xa2d/0x24c0 kernel/events/core.c:10095
SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9981
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19
entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #2 (tracepoints_mutex){+.+.}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
caif:caif_disconnect_client(): nothing to disconnect
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
tracepoint_probe_register_prio+0x36/0x6d0 kernel/tracepoint.c:279
tracepoint_probe_register+0x2b/0x40 kernel/tracepoint.c:304
trace_event_reg+0x277/0x330 kernel/trace/trace_events.c:305
perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]
perf_trace_init+0x450/0xaa0 kernel/trace/trace_event_perf.c:221
perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:8104
perf_try_init_event+0x170/0x210 kernel/events/core.c:9340
perf_init_event kernel/events/core.c:9378 [inline]
perf_event_alloc.part.0+0xd48/0x2540 kernel/events/core.c:9638
perf_event_alloc kernel/events/core.c:9991 [inline]
SYSC_perf_event_open+0xa2d/0x24c0 kernel/events/core.c:10095
SyS_perf_event_open+0x34/0x40 kernel/events/core.c:9981
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #1 (event_mutex){+.+.}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
tp_perf_event_destroy+0x16/0x20 kernel/events/core.c:8088
_free_event+0x332/0xe70 kernel/events/core.c:4238
free_event+0x38/0x50 kernel/events/core.c:4265
perf_event_release_kernel+0x364/0x7a0 kernel/events/core.c:4409
perf_release+0x37/0x50 kernel/events/core.c:4435
__fput+0x277/0x7a0 fs/file_table.c:210
____fput+0x16/0x20 fs/file_table.c:244
task_work_run+0x119/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1da/0x220 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:267 [inline]
do_syscall_64+0x4a9/0x630 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #0 (&event->child_mutex){+.+.}:
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2c89/0x45e0 kernel/locking/lockdep.c:3487
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_read_value+0x7a/0x410 kernel/events/core.c:4447
perf_read_one kernel/events/core.c:4569 [inline]
__perf_read kernel/events/core.c:4620 [inline]
perf_read+0x407/0x810 kernel/events/core.c:4633
__vfs_read+0x107/0x6b0 fs/read_write.c:411
vfs_read+0x137/0x350 fs/read_write.c:447
SYSC_read fs/read_write.c:573 [inline]
SyS_read+0xb8/0x180 fs/read_write.c:566
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7

other info that might help us debug this:

Chain exists of:
&event->child_mutex --> pmus_lock --> &cpuctx_mutex

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&cpuctx_mutex);
lock(pmus_lock);
lock(&cpuctx_mutex);
lock(&event->child_mutex);

*** DEADLOCK ***

1 lock held by syz-executor.3/11179:
#0: (&cpuctx_mutex){+.+.}, at: [<ffffffff816bafd0>]
perf_event_ctx_lock_nested+0x150/0x2c0 kernel/events/core.c:1235

stack backtrace:
CPU: 0 PID: 11179 Comm: syz-executor.3 Not tainted 4.14.112 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c lib/dump_stack.c:53
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2c89/0x45e0 kernel/locking/lockdep.c:3487
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_read_value+0x7a/0x410 kernel/events/core.c:4447
perf_read_one kernel/events/core.c:4569 [inline]
__perf_read kernel/events/core.c:4620 [inline]
perf_read+0x407/0x810 kernel/events/core.c:4633
__vfs_read+0x107/0x6b0 fs/read_write.c:411
vfs_read+0x137/0x350 fs/read_write.c:447
SYSC_read fs/read_write.c:573 [inline]
SyS_read+0xb8/0x180 fs/read_write.c:566
do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458c29
RSP: 002b:00007f6072544c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29
RDX: 0000000000001000 RSI: 0000000020000280 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f60725456d4
R13: 00000000004c5a84 R14: 00000000004d9f20 R15: 00000000ffffffff
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
chnl_net:chnl_net_open(): state disconnected
A link change request failed with some changes committed already. Interface
caif0 may have been left with an inconsistent configuration, please check.
kobject: 'kvm' (ffff8880a6e222d0): kobject_uevent_env
kobject: 'kvm' (ffff8880a6e222d0): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'kvm' (ffff8880a6e222d0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff8880a6e222d0): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'kvm' (ffff8880a6e222d0): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'kvm' (ffff8880a6e222d0): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'kvm' (ffff8880a6e222d0): kobject_uevent_env
kobject: 'kvm' (ffff8880a6e222d0): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
IPVS: ftp: loaded support on port[0] = 21
kobject: 'lo' (ffff8880736471b0): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'lo' (ffff8880736471b0): kobject_uevent_env
kobject: 'lo' (ffff8880736471b0): fill_kobj_path: path
= '/devices/virtual/net/lo'
kobject: 'queues' (ffff88809fa57e48): kobject_add_internal: parent: 'lo',
set: '<NULL>'
kobject: 'queues' (ffff88809fa57e48): kobject_uevent_env
kobject: 'queues' (ffff88809fa57e48): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'rx-0' (ffff888073398550): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'rx-0' (ffff888073398550): kobject_uevent_env
kobject: 'rx-0' (ffff888073398550): fill_kobj_path: path
= '/devices/virtual/net/lo/queues/rx-0'
kobject: 'tx-0' (ffff88809ff5aad8): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'tx-0' (ffff88809ff5aad8): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'tx-0' (ffff88809ff5aad8): fill_kobj_path: path
= '/devices/virtual/net/lo/queues/tx-0'
kobject: 'tunl0' (ffff88809b85d470): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'tunl0' (ffff88809b85d470): kobject_uevent_env
kobject: 'tunl0' (ffff88809b85d470): fill_kobj_path: path
= '/devices/virtual/net/tunl0'
kobject: 'queues' (ffff8880a0c08848): kobject_add_internal:
parent: 'tunl0', set: '<NULL>'
kobject: 'queues' (ffff8880a0c08848): kobject_uevent_env
kobject: 'queues' (ffff8880a0c08848): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (ffff8880a8fa5a90): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (ffff8880a8fa5a90): kobject_uevent_env
kobject: 'rx-0' (ffff8880a8fa5a90): fill_kobj_path: path
= '/devices/virtual/net/tunl0/queues/rx-0'
kobject: 'tx-0' (ffff888065c25a98): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (ffff888065c25a98): kobject_uevent_env
kobject: 'tx-0' (ffff888065c25a98): fill_kobj_path: path
= '/devices/virtual/net/tunl0/queues/tx-0'
kobject: 'gre0' (ffff88805885f3f0): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'gre0' (ffff88805885f3f0): kobject_uevent_env
kobject: 'gre0' (ffff88805885f3f0): fill_kobj_path: path
= '/devices/virtual/net/gre0'
kobject: 'queues' (ffff8880939bd248): kobject_add_internal: parent: 'gre0',
set: '<NULL>'
kobject: 'queues' (ffff8880939bd248): kobject_uevent_env
kobject: 'queues' (ffff8880939bd248): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (ffff888091976d90): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (ffff888091976d90): kobject_uevent_env
kobject: 'rx-0' (ffff888091976d90): fill_kobj_path: path
= '/devices/virtual/net/gre0/queues/rx-0'
kobject: 'tx-0' (ffff88809bae2058): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (ffff88809bae2058): kobject_uevent_env
kobject: 'tx-0' (ffff88809bae2058): fill_kobj_path: path
= '/devices/virtual/net/gre0/queues/tx-0'
kobject: 'gretap0' (ffff88807bed4630): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'gretap0' (ffff88807bed4630): kobject_uevent_env
kobject: 'gretap0' (ffff88807bed4630): fill_kobj_path: path
= '/devices/virtual/net/gretap0'
kobject: 'queues' (ffff8880939bd048): kobject_add_internal:
parent: 'gretap0', set: '<NULL>'
kobject: 'queues' (ffff8880939bd048): kobject_uevent_env
kobject: 'queues' (ffff8880939bd048): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (ffff8880a94dd9d0): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (ffff8880a94dd9d0): kobject_uevent_env
kobject: 'rx-0' (ffff8880a94dd9d0): fill_kobj_path: path
= '/devices/virtual/net/gretap0/queues/rx-0'
kobject: 'tx-0' (ffff88809eaefcd8): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (ffff88809eaefcd8): kobject_uevent_env
kobject: 'tx-0' (ffff88809eaefcd8): fill_kobj_path: path
= '/devices/virtual/net/gretap0/queues/tx-0'
kobject: 'batman_adv' (ffff8880a4c99300): kobject_add_internal:
parent: 'gretap0', set: '<NULL>'
kobject: 'erspan0' (ffff8880998f4830): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'erspan0' (ffff8880998f4830): kobject_uevent_env
kobject: 'erspan0' (ffff8880998f4830): fill_kobj_path: path
= '/devices/virtual/net/erspan0'
kobject: 'queues' (ffff88809fff5c48): kobject_add_internal:
parent: 'erspan0', set: '<NULL>'
kobject: 'queues' (ffff88809fff5c48): kobject_uevent_env
kobject: 'queues' (ffff88809fff5c48): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (ffff88809f690d90): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (ffff88809f690d90): kobject_uevent_env
kobject: 'rx-0' (ffff88809f690d90): fill_kobj_path: path
= '/devices/virtual/net/erspan0/queues/rx-0'
kobject: 'tx-0' (ffff88807660fad8): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (ffff88807660fad8): kobject_uevent_env
kobject: 'tx-0' (ffff88807660fad8): fill_kobj_path: path
= '/devices/virtual/net/erspan0/queues/tx-0'
kobject: 'batman_adv' (ffff888096e43700): kobject_add_internal:
parent: 'erspan0', set: '<NULL>'
kobject: 'ip_vti0' (ffff888072ce0a30): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'ip_vti0' (ffff888072ce0a30): kobject_uevent_env
kobject: 'ip_vti0' (ffff888072ce0a30): fill_kobj_path: path
= '/devices/virtual/net/ip_vti0'
kobject: 'queues' (ffff88809fc62a48): kobject_add_internal:
parent: 'ip_vti0', set: '<NULL>'
kobject: 'queues' (ffff88809fc62a48): kobject_uevent_env
kobject: 'queues' (ffff88809fc62a48): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (ffff88808ab03190): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (ffff88808ab03190): kobject_uevent_env
kobject: 'rx-0' (ffff88808ab03190): fill_kobj_path: path
= '/devices/virtual/net/ip_vti0/queues/rx-0'
kobject: 'tx-0' (ffff888066cb6818): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (ffff888066cb6818): kobject_uevent_env
kobject: 'tx-0' (ffff888066cb6818): fill_kobj_path: path
= '/devices/virtual/net/ip_vti0/queues/tx-0'
kobject: 'ip6_vti0' (ffff888085612ef0): kobject_add_internal:
parent: 'net', set: 'devices'
kobject: 'ip6_vti0' (ffff888085612ef0): kobject_uevent_env
kobject: 'ip6_vti0' (ffff888085612ef0): fill_kobj_path: path
= '/devices/virtual/net/ip6_vti0'
kobject: 'queues' (ffff88809bc9a348): kobject_add_internal:
parent: 'ip6_vti0', set: '<NULL>'
kobject: 'queues' (ffff88809bc9a348): kobject_uevent_env
kobject: 'queues' (ffff88809bc9a348): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (ffff88807da896d0): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (ffff88807da896d0): kobject_uevent_env
kobject: 'rx-0' (ffff88807da896d0): fill_kobj_path: path
= '/devices/virtual/net/ip6_vti0/queues/rx-0'
kobject: 'tx-0' (ffff88809c04b318): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (ffff88809c04b318): kobject_uevent_env
kobject: 'tx-0' (ffff88809c04b318): fill_kobj_path: path
= '/devices/virtual/net/ip6_vti0/queues/tx-0'
kobject: 'sit0' (ffff88806288f070): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'sit0' (ffff88806288f070): kobject_uevent_env
kobject: 'sit0' (ffff88806288f070): fill_kobj_path: path
= '/devices/virtual/net/sit0'
kobject: 'queues' (ffff88809f59f348): kobject_add_internal: parent: 'sit0',
set: '<NULL>'
kobject: 'queues' (ffff88809f59f348): kobject_uevent_env
kobject: 'queues' (ffff88809f59f348): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (ffff88807da89610): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (ffff88807da89610): kobject_uevent_env
kobject: 'rx-0' (ffff88807da89610): fill_kobj_path: path
= '/devices/virtual/net/sit0/queues/rx-0'
kobject: 'tx-0' (ffff888095c0d358): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (ffff888095c0d358): kobject_uevent_env
kobject: 'tx-0' (ffff888095c0d358): fill_kobj_path: path
= '/devices/virtual/net/sit0/queues/tx-0'
kobject: 'ip6tnl0' (ffff888095ee6c70): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'ip6tnl0' (ffff888095ee6c70): kobject_uevent_env
kobject: 'ip6tnl0' (ffff888095ee6c70): fill_kobj_path: path
= '/devices/virtual/net/ip6tnl0'
kobject: 'queues' (ffff88808fbed948): kobject_add_internal:
parent: 'ip6tnl0', set: '<NULL>'
kobject: 'queues' (ffff88808fbed948): kobject_uevent_env
kobject: 'queues' (ffff88808fbed948): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (ffff888073132250): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (ffff888073132250): kobject_uevent_env
kobject: 'rx-0' (ffff888073132250): fill_kobj_path: path
= '/devices/virtual/net/ip6tnl0/queues/rx-0'
kobject: 'tx-0' (ffff888096b6ed18): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (ffff888096b6ed18): kobject_uevent_env
kobject: 'tx-0' (ffff888096b6ed18): fill_kobj_path: path
= '/devices/virtual/net/ip6tnl0/queues/tx-0'
kobject: 'ip6gre0' (ffff888098970e70): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'ip6gre0' (ffff888098970e70): kobject_uevent_env
kobject: 'ip6gre0' (ffff888098970e70): fill_kobj_path: path
= '/devices/virtual/net/ip6gre0'
kobject: 'queues' (ffff88809f59f148): kobject_add_internal:
parent: 'ip6gre0', set: '<NULL>'
kobject: 'queues' (ffff88809f59f148): kobject_uevent_env
kobject: 'queues' (ffff88809f59f148): kobject_uevent_env: filter function
caused the event to drop!
kobject: 'rx-0' (ffff888076622310): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'rx-0' (ffff888076622310): kobject_uevent_env
kobject: 'rx-0' (ffff888076622310): fill_kobj_path: path
= '/devices/virtual/net/ip6gre0/queues/rx-0'
kobject: 'tx-0' (ffff8880939f6558): kobject_add_internal: parent: 'queues',
set: 'queues'
kobject: 'tx-0' (ffff8880939f6558): kobject_uevent_env
kobject: 'tx-0' (ffff8880939f6558): fill_kobj_path: path
= '/devices/virtual/net/ip6gre0/queues/tx-0'
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'rx-0' (ffff888076622310): kobject_cleanup, parent ffff88809f59f148
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'rx-0' (ffff888076622310): auto cleanup 'remove' event
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'rx-0' (ffff888076622310): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'rx-0' (ffff888076622310): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'rx-0' (ffff888076622310): auto cleanup kobject_del
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'rx-0' (ffff888076622310): calling ktype release
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'rx-0': free name
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'tx-0' (ffff8880939f6558): kobject_cleanup, parent ffff88809f59f148
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'tx-0' (ffff8880939f6558): auto cleanup 'remove' event
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'tx-0' (ffff8880939f6558): kobject_uevent_env
kobject: 'tx-0' (ffff8880939f6558): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'tx-0' (ffff8880939f6558): auto cleanup kobject_del
kobject: 'tx-0' (ffff8880939f6558): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (ffff88809f59f148): kobject_cleanup, parent
(null)
kobject: 'queues' (ffff88809f59f148): calling ktype release
kobject: 'queues' (ffff88809f59f148): kset_release
kobject: 'queues': free name
kobject: 'ip6gre0' (ffff888098970e70): kobject_uevent_env
kobject: 'ip6gre0' (ffff888098970e70): kobject_uevent_env: uevent_suppress
caused the event to drop!
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19
caif:caif_disconnect_client(): nothing to disconnect
chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT
chnl_net:chnl_net_open(): state disconnected
A link change request failed with some changes committed already. Interface
caif0 may have been left with an inconsistent configuration, please check.
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19
caif:caif_disconnect_client(): nothing to disconnect
chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT
chnl_net:chnl_net_open(): state disconnected
A link change request failed with some changes committed already. Interface
caif0 may have been left with an inconsistent configuration, please check.
kobject: 'ip6gre0' (ffff888098970e70): kobject_cleanup, parent
(null)
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'ip6gre0' (ffff888098970e70): auto cleanup 'remove' event
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'ip6gre0' (ffff888098970e70): kobject_uevent_env
kobject: 'ip6gre0' (ffff888098970e70): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'ip6gre0' (ffff888098970e70): calling ktype release
kobject: 'ip6gre0': free name
kobject: 'rx-0' (ffff888073132250): kobject_cleanup, parent ffff88808fbed948
kobject: 'rx-0' (ffff888073132250): auto cleanup 'remove' event
kobject: 'rx-0' (ffff888073132250): kobject_uevent_env
kobject: 'rx-0' (ffff888073132250): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'rx-0' (ffff888073132250): auto cleanup kobject_del
kobject: 'rx-0' (ffff888073132250): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (ffff888096b6ed18): kobject_cleanup, parent ffff88808fbed948
kobject: 'tx-0' (ffff888096b6ed18): auto cleanup 'remove' event
kobject: 'tx-0' (ffff888096b6ed18): kobject_uevent_env
kobject: 'tx-0' (ffff888096b6ed18): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'tx-0' (ffff888096b6ed18): auto cleanup kobject_del
kobject: 'tx-0' (ffff888096b6ed18): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (ffff88808fbed948): kobject_cleanup, parent
(null)
kobject: 'queues' (ffff88808fbed948): calling ktype release
kobject: 'queues' (ffff88808fbed948): kset_release
kobject: 'queues': free name
kobject: 'ip6tnl0' (ffff888095ee6c70): kobject_uevent_env
kobject: 'ip6tnl0' (ffff888095ee6c70): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'ip6tnl0' (ffff888095ee6c70): kobject_cleanup, parent
(null)
kobject: 'ip6tnl0' (ffff888095ee6c70): auto cleanup 'remove' event
kobject: 'ip6tnl0' (ffff888095ee6c70): kobject_uevent_env
kobject: 'ip6tnl0' (ffff888095ee6c70): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'ip6tnl0' (ffff888095ee6c70): calling ktype release
kobject: 'ip6tnl0': free name
kobject: 'rx-0' (ffff88807da89610): kobject_cleanup, parent ffff88809f59f348
kobject: 'rx-0' (ffff88807da89610): auto cleanup 'remove' event
kobject: 'rx-0' (ffff88807da89610): kobject_uevent_env
kobject: 'rx-0' (ffff88807da89610): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'rx-0' (ffff88807da89610): auto cleanup kobject_del
kobject: 'rx-0' (ffff88807da89610): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (ffff888095c0d358): kobject_cleanup, parent ffff88809f59f348
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'tx-0' (ffff888095c0d358): auto cleanup 'remove' event
kobject: 'tx-0' (ffff888095c0d358): kobject_uevent_env
kobject: 'tx-0' (ffff888095c0d358): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'tx-0' (ffff888095c0d358): auto cleanup kobject_del
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'tx-0' (ffff888095c0d358): calling ktype release
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'tx-0': free name
kobject: 'queues' (ffff88809f59f348): kobject_cleanup, parent
(null)
kobject: 'queues' (ffff88809f59f348): calling ktype release
kobject: 'queues' (ffff88809f59f348): kset_release
kobject: 'queues': free name
kobject: 'sit0' (ffff88806288f070): kobject_uevent_env
kobject: 'sit0' (ffff88806288f070): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
caif:caif_disconnect_client(): nothing to disconnect
chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT
chnl_net:chnl_net_open(): state disconnected
A link change request failed with some changes committed already. Interface
caif0 may have been left with an inconsistent configuration, please check.
kobject: 'sit0' (ffff88806288f070): kobject_cleanup, parent (null)
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'sit0' (ffff88806288f070): auto cleanup 'remove' event
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'sit0' (ffff88806288f070): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'sit0' (ffff88806288f070): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'sit0' (ffff88806288f070): calling ktype release
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'sit0': free name
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff8880a6e222d0): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'kvm' (ffff8880a6e222d0): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'kvm' (ffff8880a6e222d0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'rx-0' (ffff88807da896d0): kobject_cleanup, parent ffff88809bc9a348
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'kvm' (ffff8880a6e222d0): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'rx-0' (ffff88807da896d0): auto cleanup 'remove' event
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'rx-0' (ffff88807da896d0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'kvm' (ffff8880a6e222d0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'kvm' (ffff8880a6e222d0): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'rx-0' (ffff88807da896d0): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'rx-0' (ffff88807da896d0): auto cleanup kobject_del
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'kvm' (ffff8880a6e222d0): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'rx-0' (ffff88807da896d0): calling ktype release
kobject: 'kvm' (ffff8880a6e222d0): fill_kobj_path: path
= '/devices/virtual/misc/kvm'
kobject: 'rx-0': free name
kobject: 'tx-0' (ffff88809c04b318): kobject_cleanup, parent ffff88809bc9a348
kobject: 'tx-0' (ffff88809c04b318): auto cleanup 'remove' event
kobject: 'tx-0' (ffff88809c04b318): kobject_uevent_env
kobject: 'tx-0' (ffff88809c04b318): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'tx-0' (ffff88809c04b318): auto cleanup kobject_del
kobject: 'tx-0' (ffff88809c04b318): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (ffff88809bc9a348): kobject_cleanup, parent
(null)
kobject: 'queues' (ffff88809bc9a348): calling ktype release
kobject: 'queues' (ffff88809bc9a348): kset_release
kobject: 'queues': free name
kobject: 'ip6_vti0' (ffff888085612ef0): kobject_uevent_env
kobject: 'ip6_vti0' (ffff888085612ef0): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'ip6_vti0' (ffff888085612ef0): kobject_cleanup, parent
(null)
kobject: 'ip6_vti0' (ffff888085612ef0): auto cleanup 'remove' event
kobject: 'ip6_vti0' (ffff888085612ef0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'ip6_vti0' (ffff888085612ef0): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'ip6_vti0' (ffff888085612ef0): calling ktype release
kobject: 'ip6_vti0': free name
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'rx-0' (ffff88808ab03190): kobject_cleanup, parent ffff88809fc62a48
kobject: 'rx-0' (ffff88808ab03190): auto cleanup 'remove' event
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'rx-0' (ffff88808ab03190): kobject_uevent_env
kobject: 'rx-0' (ffff88808ab03190): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'rx-0' (ffff88808ab03190): auto cleanup kobject_del
kobject: 'rx-0' (ffff88808ab03190): calling ktype release
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'rx-0': free name
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'tx-0' (ffff888066cb6818): kobject_cleanup, parent ffff88809fc62a48
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'tx-0' (ffff888066cb6818): auto cleanup 'remove' event
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'tx-0' (ffff888066cb6818): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'tx-0' (ffff888066cb6818): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'tx-0' (ffff888066cb6818): auto cleanup kobject_del
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'tx-0' (ffff888066cb6818): calling ktype release
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'tx-0': free name
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'queues' (ffff88809fc62a48): kobject_cleanup, parent
(null)
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'queues' (ffff88809fc62a48): calling ktype release
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'queues' (ffff88809fc62a48): kset_release
kobject: 'queues': free name
kobject: 'ip_vti0' (ffff888072ce0a30): kobject_uevent_env
kobject: 'ip_vti0' (ffff888072ce0a30): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'ip_vti0' (ffff888072ce0a30): kobject_cleanup, parent
(null)
kobject: 'ip_vti0' (ffff888072ce0a30): auto cleanup 'remove' event
kobject: 'ip_vti0' (ffff888072ce0a30): kobject_uevent_env
kobject: 'ip_vti0' (ffff888072ce0a30): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'ip_vti0' (ffff888072ce0a30): calling ktype release
kobject: 'ip_vti0': free name
kobject: 'batman_adv' (ffff888096e43700): kobject_uevent_env
kobject: 'batman_adv' (ffff888096e43700): kobject_uevent_env: filter
function caused the event to drop!
kobject: 'batman_adv' (ffff888096e43700): kobject_cleanup, parent
(null)
kobject: 'batman_adv' (ffff888096e43700): calling ktype release
kobject: (ffff888096e43700): dynamic_kobj_release
kobject: 'batman_adv': free name
kobject: 'rx-0' (ffff88809f690d90): kobject_cleanup, parent ffff88809fff5c48
kobject: 'rx-0' (ffff88809f690d90): auto cleanup 'remove' event
kobject: 'rx-0' (ffff88809f690d90): kobject_uevent_env
kobject: 'rx-0' (ffff88809f690d90): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'rx-0' (ffff88809f690d90): auto cleanup kobject_del
kobject: 'rx-0' (ffff88809f690d90): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (ffff88807660fad8): kobject_cleanup, parent ffff88809fff5c48
kobject: 'tx-0' (ffff88807660fad8): auto cleanup 'remove' event
kobject: 'tx-0' (ffff88807660fad8): kobject_uevent_env
kobject: 'tx-0' (ffff88807660fad8): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'tx-0' (ffff88807660fad8): auto cleanup kobject_del
kobject: 'tx-0' (ffff88807660fad8): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (ffff88809fff5c48): kobject_cleanup, parent
(null)
kobject: 'queues' (ffff88809fff5c48): calling ktype release
kobject: 'queues' (ffff88809fff5c48): kset_release
kobject: 'queues': free name
kobject: 'erspan0' (ffff8880998f4830): kobject_uevent_env
kobject: 'erspan0' (ffff8880998f4830): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'erspan0' (ffff8880998f4830): kobject_cleanup, parent
(null)
kobject: 'erspan0' (ffff8880998f4830): auto cleanup 'remove' event
kobject: 'erspan0' (ffff8880998f4830): kobject_uevent_env
kobject: 'erspan0' (ffff8880998f4830): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'erspan0' (ffff8880998f4830): calling ktype release
kobject: 'erspan0': free name
kobject: 'batman_adv' (ffff8880a4c99300): kobject_uevent_env
kobject: 'batman_adv' (ffff8880a4c99300): kobject_uevent_env: filter
function caused the event to drop!
kobject: 'batman_adv' (ffff8880a4c99300): kobject_cleanup, parent
(null)
kobject: 'batman_adv' (ffff8880a4c99300): calling ktype release
kobject: (ffff8880a4c99300): dynamic_kobj_release
kobject: 'batman_adv': free name
kobject: 'rx-0' (ffff8880a94dd9d0): kobject_cleanup, parent ffff8880939bd048
kobject: 'rx-0' (ffff8880a94dd9d0): auto cleanup 'remove' event
kobject: 'rx-0' (ffff8880a94dd9d0): kobject_uevent_env
kobject: 'rx-0' (ffff8880a94dd9d0): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'rx-0' (ffff8880a94dd9d0): auto cleanup kobject_del
kobject: 'rx-0' (ffff8880a94dd9d0): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (ffff88809eaefcd8): kobject_cleanup, parent ffff8880939bd048
kobject: 'tx-0' (ffff88809eaefcd8): auto cleanup 'remove' event
kobject: 'tx-0' (ffff88809eaefcd8): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'tx-0' (ffff88809eaefcd8): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'tx-0' (ffff88809eaefcd8): auto cleanup kobject_del
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'tx-0' (ffff88809eaefcd8): calling ktype release
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'tx-0': free name
kobject: 'queues' (ffff8880939bd048): kobject_cleanup, parent
(null)
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'queues' (ffff8880939bd048): calling ktype release
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'queues' (ffff8880939bd048): kset_release
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'queues': free name
kobject: 'gretap0' (ffff88807bed4630): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'gretap0' (ffff88807bed4630): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'gretap0' (ffff88807bed4630): kobject_cleanup, parent
(null)
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'gretap0' (ffff88807bed4630): auto cleanup 'remove' event
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'gretap0' (ffff88807bed4630): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'gretap0' (ffff88807bed4630): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'gretap0' (ffff88807bed4630): calling ktype release
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'gretap0': free name
kobject: 'rx-0' (ffff888091976d90): kobject_cleanup, parent ffff8880939bd248
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'rx-0' (ffff888091976d90): auto cleanup 'remove' event
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'rx-0' (ffff888091976d90): kobject_uevent_env
kobject: 'rx-0' (ffff888091976d90): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'rx-0' (ffff888091976d90): auto cleanup kobject_del
kobject: 'rx-0' (ffff888091976d90): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (ffff88809bae2058): kobject_cleanup, parent ffff8880939bd248
kobject: 'tx-0' (ffff88809bae2058): auto cleanup 'remove' event
kobject: 'tx-0' (ffff88809bae2058): kobject_uevent_env
kobject: 'tx-0' (ffff88809bae2058): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'tx-0' (ffff88809bae2058): auto cleanup kobject_del
kobject: 'tx-0' (ffff88809bae2058): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (ffff8880939bd248): kobject_cleanup, parent
(null)
kobject: 'queues' (ffff8880939bd248): calling ktype release
kobject: 'queues' (ffff8880939bd248): kset_release
kobject: 'queues': free name
kobject: 'gre0' (ffff88805885f3f0): kobject_uevent_env
kobject: 'gre0' (ffff88805885f3f0): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'gre0' (ffff88805885f3f0): kobject_cleanup, parent (null)
kobject: 'gre0' (ffff88805885f3f0): auto cleanup 'remove' event
kobject: 'gre0' (ffff88805885f3f0): kobject_uevent_env
kobject: 'gre0' (ffff88805885f3f0): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'gre0' (ffff88805885f3f0): calling ktype release
kobject: 'gre0': free name
kobject: 'rx-0' (ffff8880a8fa5a90): kobject_cleanup, parent ffff8880a0c08848
kobject: 'rx-0' (ffff8880a8fa5a90): auto cleanup 'remove' event
kobject: 'rx-0' (ffff8880a8fa5a90): kobject_uevent_env
kobject: 'rx-0' (ffff8880a8fa5a90): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'rx-0' (ffff8880a8fa5a90): auto cleanup kobject_del
kobject: 'rx-0' (ffff8880a8fa5a90): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (ffff888065c25a98): kobject_cleanup, parent ffff8880a0c08848
kobject: 'tx-0' (ffff888065c25a98): auto cleanup 'remove' event
kobject: 'tx-0' (ffff888065c25a98): kobject_uevent_env
kobject: 'tx-0' (ffff888065c25a98): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'tx-0' (ffff888065c25a98): auto cleanup kobject_del
kobject: 'tx-0' (ffff888065c25a98): calling ktype release
kobject: 'tx-0': free name
kobject: 'queues' (ffff8880a0c08848): kobject_cleanup, parent
(null)
kobject: 'queues' (ffff8880a0c08848): calling ktype release
kobject: 'queues' (ffff8880a0c08848): kset_release
kobject: 'queues': free name
kobject: 'tunl0' (ffff88809b85d470): kobject_uevent_env
kobject: 'tunl0' (ffff88809b85d470): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'tunl0' (ffff88809b85d470): kobject_cleanup, parent
(null)
kobject: 'tunl0' (ffff88809b85d470): auto cleanup 'remove' event
kobject: 'tunl0' (ffff88809b85d470): kobject_uevent_env
kobject: 'tunl0' (ffff88809b85d470): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'tunl0' (ffff88809b85d470): calling ktype release
kobject: 'tunl0': free name
kobject: 'rx-0' (ffff888073398550): kobject_cleanup, parent ffff88809fa57e48
kobject: 'rx-0' (ffff888073398550): auto cleanup 'remove' event
kobject: 'rx-0' (ffff888073398550): kobject_uevent_env
kobject: 'rx-0' (ffff888073398550): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'rx-0' (ffff888073398550): auto cleanup kobject_del
kobject: 'rx-0' (ffff888073398550): calling ktype release
kobject: 'rx-0': free name
kobject: 'tx-0' (ffff88809ff5aad8): kobject_cleanup, parent ffff88809fa57e48
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'tx-0' (ffff88809ff5aad8): auto cleanup 'remove' event
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'tx-0' (ffff88809ff5aad8): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'tx-0' (ffff88809ff5aad8): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'tx-0' (ffff88809ff5aad8): auto cleanup kobject_del
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'tx-0' (ffff88809ff5aad8): calling ktype release
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'tx-0': free name
kobject: 'queues' (ffff88809fa57e48): kobject_cleanup, parent
(null)
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'queues' (ffff88809fa57e48): calling ktype release
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'queues' (ffff88809fa57e48): kset_release
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'queues': free name
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'lo' (ffff8880736471b0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'lo' (ffff8880736471b0): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'lo' (ffff8880736471b0): kobject_cleanup, parent (null)
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'lo' (ffff8880736471b0): auto cleanup 'remove' event
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'lo' (ffff8880736471b0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'lo' (ffff8880736471b0): kobject_uevent_env: uevent_suppress
caused the event to drop!
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'lo' (ffff8880736471b0): calling ktype release
kobject: 'lo': free name
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop0' (ffff8880a48ad720): kobject_uevent_env
kobject: 'loop0' (ffff8880a48ad720): fill_kobj_path: path
= '/devices/virtual/block/loop0'
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop5' (ffff8880a4a4ea60): kobject_uevent_env
kobject: 'loop5' (ffff8880a4a4ea60): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop2' (ffff8880a49626e0): kobject_uevent_env
kobject: 'loop2' (ffff8880a49626e0): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop3' (ffff8880a49c60e0): kobject_uevent_env
kobject: 'loop3' (ffff8880a49c60e0): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'nr0 ' (ffff88805dd1b530): kobject_add_internal: parent: 'net',
set: 'devices'
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop1' (ffff8880a49197a0): kobject_uevent_env
kobject: 'nr0 ' (ffff88805dd1b530): kobject_uevent_env
kobject: 'loop1' (ffff8880a49197a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'nr0 ' (ffff88805dd1b530): fill_kobj_path: path
= '/devices/virtual/net/nr0 '
kobject: 'loop4' (ffff8880a49f2160): kobject_uevent_env
kobject: 'queues' (ffff8880a029c848): kobject_add_internal: parent: 'nr0 ',
set: '<NULL>'
kobject: 'loop4' (ffff8880a49f2160): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'queues' (ffff8880a029c848): kobject_uevent_env

---
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,

Apr 18, 2020, 11:08:15 PM4/18/20

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following crash on:

HEAD commit: c10b57a5 Linux 4.14.176
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=124e6e73e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=457897b554d08537

dashboard link: https://syzkaller.appspot.com/bug?extid=55050b0f87558b5401b7
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11b05d20100000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+55050b...@syzkaller.appspotmail.com

batman_adv: batadv0: Interface activated: batadv_slave_1
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready

======================================================
WARNING: possible circular locking dependency detected

4.14.176-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/7960 is trying to acquire lock:
(&event->child_mutex){+.+.}, at: [<ffffffff8168e018>] perf_event_read_value+0x78/0x410 kernel/events/core.c:4447

but task is already holding lock:

(&cpuctx_mutex){+.+.}, at: [<ffffffff8168c52d>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1235

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #5 (&cpuctx_mutex){+.+.}:

__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893

perf_event_init_cpu+0xb7/0x170 kernel/events/core.c:11234
perf_event_init+0x2cc/0x308 kernel/events/core.c:11281
start_kernel+0x3b1/0x676 init/main.c:620
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240

-> #4 (pmus_lock){+.+.}:

__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893

perf_event_init_cpu+0x2c/0x170 kernel/events/core.c:11228
cpuhp_invoke_callback+0x1e6/0x1ad0 kernel/cpu.c:184
cpuhp_up_callbacks kernel/cpu.c:572 [inline]
_cpu_up+0x21a/0x520 kernel/cpu.c:1140
do_cpu_up kernel/cpu.c:1175 [inline]
do_cpu_up+0x9a/0x160 kernel/cpu.c:1147
smp_init+0x149/0x15e kernel/smp.c:578
kernel_init_freeable+0x305/0x526 init/main.c:1066
kernel_init+0xd/0x15b init/main.c:998
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

-> #3 (cpu_hotplug_lock.rw_sem){++++}:

percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]

cpus_read_lock+0x39/0xc0 kernel/cpu.c:295
static_key_slow_inc+0xe/0x20 kernel/jump_label.c:123
tracepoint_add_func kernel/tracepoint.c:223 [inline]
tracepoint_probe_register_prio+0x4d4/0x6d0 kernel/tracepoint.c:283
trace_event_reg+0x272/0x330 kernel/trace/trace_events.c:305

perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]

perf_trace_init+0x424/0xa50 kernel/trace/trace_event_perf.c:221
perf_tp_event_init+0x79/0xf0 kernel/events/core.c:8117
perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9353
perf_init_event kernel/events/core.c:9391 [inline]
perf_event_alloc.part.0+0xd89/0x25a0 kernel/events/core.c:9651
perf_event_alloc kernel/events/core.c:10004 [inline]
SYSC_perf_event_open+0xa80/0x24a0 kernel/events/core.c:10108
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292

entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #2 (tracepoints_mutex){+.+.}:

__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893

tracepoint_probe_register_prio+0x35/0x6d0 kernel/tracepoint.c:279
trace_event_reg+0x272/0x330 kernel/trace/trace_events.c:305

perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]

entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #1 (event_mutex){+.+.}:

__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893

perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:234
_free_event+0x328/0xe30 kernel/events/core.c:4238
free_event+0x32/0x40 kernel/events/core.c:4265
perf_event_release_kernel+0x35c/0x870 kernel/events/core.c:4409
perf_release+0x33/0x40 kernel/events/core.c:4435
__fput+0x25f/0x790 fs/file_table.c:210
task_work_run+0x113/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1d6/0x220 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297

entry_SYSCALL_64_after_hwframe+0x42/0xb7

-> #0 (&event->child_mutex){+.+.}:

lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994

__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893

perf_event_read_value+0x78/0x410 kernel/events/core.c:4447

perf_read_one kernel/events/core.c:4569 [inline]
__perf_read kernel/events/core.c:4620 [inline]

entry_SYSCALL_64_after_hwframe+0x42/0xb7

other info that might help us debug this:

Chain exists of:
&event->child_mutex --> pmus_lock --> &cpuctx_mutex

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&cpuctx_mutex);
lock(pmus_lock);
lock(&cpuctx_mutex);
lock(&event->child_mutex);

*** DEADLOCK ***

1 lock held by syz-executor.0/7960:
#0: (&cpuctx_mutex){+.+.}, at: [<ffffffff8168c52d>] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1235

stack backtrace:
CPU: 1 PID: 7960 Comm: syz-executor.0 Not tainted 4.14.176-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]

dump_stack+0x13e/0x194 lib/dump_stack.c:58
print_circular_bug.isra.0.cold+0x1c4/0x282 kernel/locking/lockdep.c:1258

check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]

__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994

__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893

perf_event_read_value+0x78/0x410 kernel/events/core.c:4447

perf_read_one kernel/events/core.c:4569 [inline]
__perf_read kernel/events/core.c:4620 [inline]

perf_read+0x3e2/0x7c0 kernel/events/core.c:4633
do_loop_readv_writev fs/read_write.c:695 [inline]
do_loop_readv_writev fs/read_write.c:682 [inline]
do_iter_read+0x3e3/0x5a0 fs/read_write.c:919
vfs_readv+0xd3/0x130 fs/read_write.c:981
do_readv+0xfc/0x2c0 fs/read_write.c:1014
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c869
RSP: 002b:00007f87dbb46c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00007f87dbb476d4 RCX: 000000000045c869
RDX: 0000000000000001 RSI: 0000000020000280 RDI: 0000000000000008
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000088c R14: 00000000004cb270 R15: 000000000076bf0c

Reply all

Reply to author

Forward

0 new messages