possible deadlock in static_key_slow_dec (2)
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syzbot
Oct 16, 2020, 6:05:19 PM10/16/20
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Hello,
syzbot found the following issue on:
HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=145f44a0500000
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=2a13fd75b5be0f78259a
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2a13fd...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
4.19.150-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.5/12477 is trying to acquire lock:
000000000163317c (cpu_hotplug_lock.rw_sem){++++}, at: __static_key_slow_dec kernel/jump_label.c:212 [inline]
000000000163317c (cpu_hotplug_lock.rw_sem){++++}, at: static_key_slow_dec+0x6c/0xb0 kernel/jump_label.c:227
but task is already holding lock:
00000000c24b7e63 (&mm->mmap_sem){++++}, at: vm_mmap_pgoff+0x152/0x200 mm/util.c:355
which lock already depends on the new lock.
overlayfs: failed to resolve './file0': -2
the existing dependency chain (in reverse order) is:
-> #3 (&mm->mmap_sem){++++}:
perf_copy_attr+0xab/0x7a0 kernel/events/core.c:10251
_perf_ioctl+0x6aa/0x23f0 kernel/events/core.c:5125
perf_ioctl+0x55/0x80 kernel/events/core.c:5152
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&cpuctx_mutex){+.+.}:
NILFS (loop3): I/O error reading segment
perf_event_init_cpu+0xfe/0x1f0 kernel/events/core.c:11804
perf_event_init+0x470/0x4b8 kernel/events/core.c:11851
start_kernel+0x600/0x978 init/main.c:644
NILFS (loop3): error -5 while searching super root
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #1 (pmus_lock){+.+.}:
perf_event_init_cpu+0x2a/0x1f0 kernel/events/core.c:11798
cpuhp_invoke_callback+0x259/0x1de0 kernel/cpu.c:169
cpuhp_up_callbacks kernel/cpu.c:583 [inline]
_cpu_up+0x284/0x560 kernel/cpu.c:1140
do_cpu_up+0xdd/0x230 kernel/cpu.c:1175
smp_init+0x1ed/0x202 kernel/smp.c:578
kernel_init_freeable+0x671/0xc31 init/main.c:1138
kernel_init+0xe/0x1e2 init/main.c:1062
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
-> #0 (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+0x3b/0xd0 kernel/cpu.c:289
__static_key_slow_dec kernel/jump_label.c:212 [inline]
static_key_slow_dec+0x6c/0xb0 kernel/jump_label.c:227
sw_perf_event_destroy+0x99/0x140 kernel/events/core.c:8285
_free_event+0x32c/0x1240 kernel/events/core.c:4459
put_event kernel/events/core.c:4553 [inline]
perf_mmap_close+0x77f/0xf50 kernel/events/core.c:5556
remove_vma+0xa9/0x170 mm/mmap.c:176
remove_vma_list mm/mmap.c:2550 [inline]
do_munmap+0x717/0xe10 mm/mmap.c:2786
mmap_region+0x1f1/0x1510 mm/mmap.c:1700
do_mmap+0x8e8/0x1080 mm/mmap.c:1530
do_mmap_pgoff include/linux/mm.h:2326 [inline]
vm_mmap_pgoff+0x197/0x200 mm/util.c:357
ksys_mmap_pgoff+0x2d1/0x660 mm/mmap.c:1580
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
cpu_hotplug_lock.rw_sem --> &cpuctx_mutex --> &mm->mmap_sem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&mm->mmap_sem);
lock(&cpuctx_mutex);
lock(&mm->mmap_sem);
lock(cpu_hotplug_lock.rw_sem);
*** DEADLOCK ***
1 lock held by syz-executor.5/12477:
#0: 00000000c24b7e63 (&mm->mmap_sem){++++}, at: vm_mmap_pgoff+0x152/0x200 mm/util.c:355
stack backtrace:
CPU: 0 PID: 12477 Comm: syz-executor.5 Not tainted 4.19.150-syzkaller #0
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+0x22c/0x33e lib/dump_stack.c:118
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1221
check_prev_add kernel/locking/lockdep.c:1865 [inline]
check_prevs_add kernel/locking/lockdep.c:1978 [inline]
validate_chain kernel/locking/lockdep.c:2419 [inline]
__lock_acquire+0x37ad/0x3ff0 kernel/locking/lockdep.c:3415
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3907
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+0x3b/0xd0 kernel/cpu.c:289
__static_key_slow_dec kernel/jump_label.c:212 [inline]
static_key_slow_dec+0x6c/0xb0 kernel/jump_label.c:227
sw_perf_event_destroy+0x99/0x140 kernel/events/core.c:8285
_free_event+0x32c/0x1240 kernel/events/core.c:4459
put_event kernel/events/core.c:4553 [inline]
perf_mmap_close+0x77f/0xf50 kernel/events/core.c:5556
remove_vma+0xa9/0x170 mm/mmap.c:176
remove_vma_list mm/mmap.c:2550 [inline]
do_munmap+0x717/0xe10 mm/mmap.c:2786
mmap_region+0x1f1/0x1510 mm/mmap.c:1700
do_mmap+0x8e8/0x1080 mm/mmap.c:1530
do_mmap_pgoff include/linux/mm.h:2326 [inline]
vm_mmap_pgoff+0x197/0x200 mm/util.c:357
ksys_mmap_pgoff+0x2d1/0x660 mm/mmap.c:1580
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45de59
Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4048926c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000021200 RCX: 000000000045de59
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000
RBP: 000000000118c0c8 R08: 0000000000000009 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 000000000118c07c
R13: 00007ffcceb2e26f R14: 00007f40489279c0 R15: 000000000118c07c
overlayfs: failed to resolve './file0': -2
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: unrecognized mount option "work� dir=./file1" or missing value
overlayfs: unrecognized mount option "work� dir=./file1" or missing value
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: unrecognized mount option "lowworkdir=./fi�e1" or missing value
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
overlayfs: unrecognized mount option "lowworkdir=./fi�e1" or missing value
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: missing 'workdir'
overlayfs: missing 'workdir'
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
overlayfs: unrecognized mount option "lowe{dir=./f+le1" or missing value
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: unrecognized mount option "lowe{dir=./f+le1" or missing value
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: failed to resolve './file1': -2
overlayfs: failed to resolve './file1': -2
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
kvm [12941]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x0
NILFS (loop3): couldn't find nilfs on the device
overlayfs: failed to resolve './file05 �=6^֭e��/ �}���}j C�x� c�0{eR"���0WX8͘��� ����Ch�!�6�"� ��': -2
overlayfs: failed to resolve './file05 �=6^֭e��/ �}���}j C�x� c�0{eR"���0WX8͘��� ����Ch�!�6�"� ��': -2
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
device lo left promiscuous mode
overlayfs: failed to resolve './file0U���E� y�@N9�� ѵ��% �� �V�� � 5�>���JR��| �� t� jF(%�F�Q�� �P�&�� �lB�M� J�X+ ��&C ߸���� V|jݏ'Ϝ� ��K� �W�� �]�g#�vV���`��|�?�� u�P�0z` b � ;�i�j�_�q�� ': -2
overlayfs: failed to resolve './file0U���E� y�@N9�� ѵ��% �� �V�� � 5�>���JR��| �� t� jF(%�F�Q�� �P�&�� �lB�M� J�X+ ��&C ߸���� V|jݏ'Ϝ� ��K� �W�� �]�g#�vV���`��|�?�� u�P�0z` b � ;�i�j�_�q�� ': -2
NILFS (loop3): couldn't find nilfs on the device
overlayfs: unrecognized mount option "Lowerdir=./bus" or missing value
overlayfs: unrecognized mount option "Lowerdir=./bus" or missing value
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
kvm [13118]: vcpu0, guest rIP: 0xcc ignored wrmsr: 0x11e data 0xbe702111
NILFS (loop3): couldn't find nilfs on the device
kvm [13118]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc1 data 0x0
kvm [13118]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc1 data 0x0
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
kvm [13118]: vcpu0, guest rIP: 0xcc ignored wrmsr: 0x11e data 0xbe702111
kvm [13118]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc1 data 0x0
kvm [13118]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc1 data 0x0
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
overlayfs: unrecognized mount option "lo" or missing value
overlayfs: unrecognized mount option "lo" or missing value
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
overlayfs: unrecognized mount option "lowerdir}C/bus" or missing value
overlayfs: unrecognized mount option "lowerdir}C/bus" or missing value
NILFS (loop3): couldn't find nilfs on the device
caif:caif_disconnect_client(): nothing to disconnect
NILFS (loop3): couldn't find nilfs on the device
caif:caif_disconnect_client(): nothing to disconnect
kvm [13319]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x0
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=145f44a0500000
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=2a13fd75b5be0f78259a
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2a13fd...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
4.19.150-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.5/12477 is trying to acquire lock:
000000000163317c (cpu_hotplug_lock.rw_sem){++++}, at: __static_key_slow_dec kernel/jump_label.c:212 [inline]
000000000163317c (cpu_hotplug_lock.rw_sem){++++}, at: static_key_slow_dec+0x6c/0xb0 kernel/jump_label.c:227
but task is already holding lock:
00000000c24b7e63 (&mm->mmap_sem){++++}, at: vm_mmap_pgoff+0x152/0x200 mm/util.c:355
which lock already depends on the new lock.
overlayfs: failed to resolve './file0': -2
the existing dependency chain (in reverse order) is:
-> #3 (&mm->mmap_sem){++++}:
perf_copy_attr+0xab/0x7a0 kernel/events/core.c:10251
_perf_ioctl+0x6aa/0x23f0 kernel/events/core.c:5125
perf_ioctl+0x55/0x80 kernel/events/core.c:5152
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&cpuctx_mutex){+.+.}:
NILFS (loop3): I/O error reading segment
perf_event_init_cpu+0xfe/0x1f0 kernel/events/core.c:11804
perf_event_init+0x470/0x4b8 kernel/events/core.c:11851
start_kernel+0x600/0x978 init/main.c:644
NILFS (loop3): error -5 while searching super root
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #1 (pmus_lock){+.+.}:
perf_event_init_cpu+0x2a/0x1f0 kernel/events/core.c:11798
cpuhp_invoke_callback+0x259/0x1de0 kernel/cpu.c:169
cpuhp_up_callbacks kernel/cpu.c:583 [inline]
_cpu_up+0x284/0x560 kernel/cpu.c:1140
do_cpu_up+0xdd/0x230 kernel/cpu.c:1175
smp_init+0x1ed/0x202 kernel/smp.c:578
kernel_init_freeable+0x671/0xc31 init/main.c:1138
kernel_init+0xe/0x1e2 init/main.c:1062
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
-> #0 (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+0x3b/0xd0 kernel/cpu.c:289
__static_key_slow_dec kernel/jump_label.c:212 [inline]
static_key_slow_dec+0x6c/0xb0 kernel/jump_label.c:227
sw_perf_event_destroy+0x99/0x140 kernel/events/core.c:8285
_free_event+0x32c/0x1240 kernel/events/core.c:4459
put_event kernel/events/core.c:4553 [inline]
perf_mmap_close+0x77f/0xf50 kernel/events/core.c:5556
remove_vma+0xa9/0x170 mm/mmap.c:176
remove_vma_list mm/mmap.c:2550 [inline]
do_munmap+0x717/0xe10 mm/mmap.c:2786
mmap_region+0x1f1/0x1510 mm/mmap.c:1700
do_mmap+0x8e8/0x1080 mm/mmap.c:1530
do_mmap_pgoff include/linux/mm.h:2326 [inline]
vm_mmap_pgoff+0x197/0x200 mm/util.c:357
ksys_mmap_pgoff+0x2d1/0x660 mm/mmap.c:1580
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
cpu_hotplug_lock.rw_sem --> &cpuctx_mutex --> &mm->mmap_sem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&mm->mmap_sem);
lock(&cpuctx_mutex);
lock(&mm->mmap_sem);
lock(cpu_hotplug_lock.rw_sem);
*** DEADLOCK ***
1 lock held by syz-executor.5/12477:
#0: 00000000c24b7e63 (&mm->mmap_sem){++++}, at: vm_mmap_pgoff+0x152/0x200 mm/util.c:355
stack backtrace:
CPU: 0 PID: 12477 Comm: syz-executor.5 Not tainted 4.19.150-syzkaller #0
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+0x22c/0x33e lib/dump_stack.c:118
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1221
check_prev_add kernel/locking/lockdep.c:1865 [inline]
check_prevs_add kernel/locking/lockdep.c:1978 [inline]
validate_chain kernel/locking/lockdep.c:2419 [inline]
__lock_acquire+0x37ad/0x3ff0 kernel/locking/lockdep.c:3415
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3907
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+0x3b/0xd0 kernel/cpu.c:289
__static_key_slow_dec kernel/jump_label.c:212 [inline]
static_key_slow_dec+0x6c/0xb0 kernel/jump_label.c:227
sw_perf_event_destroy+0x99/0x140 kernel/events/core.c:8285
_free_event+0x32c/0x1240 kernel/events/core.c:4459
put_event kernel/events/core.c:4553 [inline]
perf_mmap_close+0x77f/0xf50 kernel/events/core.c:5556
remove_vma+0xa9/0x170 mm/mmap.c:176
remove_vma_list mm/mmap.c:2550 [inline]
do_munmap+0x717/0xe10 mm/mmap.c:2786
mmap_region+0x1f1/0x1510 mm/mmap.c:1700
do_mmap+0x8e8/0x1080 mm/mmap.c:1530
do_mmap_pgoff include/linux/mm.h:2326 [inline]
vm_mmap_pgoff+0x197/0x200 mm/util.c:357
ksys_mmap_pgoff+0x2d1/0x660 mm/mmap.c:1580
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45de59
Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4048926c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000021200 RCX: 000000000045de59
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000
RBP: 000000000118c0c8 R08: 0000000000000009 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 000000000118c07c
R13: 00007ffcceb2e26f R14: 00007f40489279c0 R15: 000000000118c07c
overlayfs: failed to resolve './file0': -2
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: unrecognized mount option "work� dir=./file1" or missing value
overlayfs: unrecognized mount option "work� dir=./file1" or missing value
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: unrecognized mount option "lowworkdir=./fi�e1" or missing value
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
overlayfs: unrecognized mount option "lowworkdir=./fi�e1" or missing value
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: missing 'workdir'
overlayfs: missing 'workdir'
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
overlayfs: unrecognized mount option "lowe{dir=./f+le1" or missing value
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: unrecognized mount option "lowe{dir=./f+le1" or missing value
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
NILFS (loop3): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop3): I/O error reading segment
NILFS (loop3): error -5 while searching super root
overlayfs: failed to resolve './file1': -2
overlayfs: failed to resolve './file1': -2
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
kvm [12941]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x0
NILFS (loop3): couldn't find nilfs on the device
overlayfs: failed to resolve './file05 �=6^֭e��/ �}���}j C�x� c�0{eR"���0WX8͘��� ����Ch�!�6�"� ��': -2
overlayfs: failed to resolve './file05 �=6^֭e��/ �}���}j C�x� c�0{eR"���0WX8͘��� ����Ch�!�6�"� ��': -2
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
device lo left promiscuous mode
overlayfs: failed to resolve './file0U���E� y�@N9�� ѵ��% �� �V�� � 5�>���JR��| �� t� jF(%�F�Q�� �P�&�� �lB�M� J�X+ ��&C ߸���� V|jݏ'Ϝ� ��K� �W�� �]�g#�vV���`��|�?�� u�P�0z` b � ;�i�j�_�q�� ': -2
overlayfs: failed to resolve './file0U���E� y�@N9�� ѵ��% �� �V�� � 5�>���JR��| �� t� jF(%�F�Q�� �P�&�� �lB�M� J�X+ ��&C ߸���� V|jݏ'Ϝ� ��K� �W�� �]�g#�vV���`��|�?�� u�P�0z` b � ;�i�j�_�q�� ': -2
NILFS (loop3): couldn't find nilfs on the device
overlayfs: unrecognized mount option "Lowerdir=./bus" or missing value
overlayfs: unrecognized mount option "Lowerdir=./bus" or missing value
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
kvm [13118]: vcpu0, guest rIP: 0xcc ignored wrmsr: 0x11e data 0xbe702111
NILFS (loop3): couldn't find nilfs on the device
kvm [13118]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc1 data 0x0
kvm [13118]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc1 data 0x0
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
kvm [13118]: vcpu0, guest rIP: 0xcc ignored wrmsr: 0x11e data 0xbe702111
kvm [13118]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc1 data 0x0
kvm [13118]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc1 data 0x0
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
overlayfs: unrecognized mount option "lo" or missing value
overlayfs: unrecognized mount option "lo" or missing value
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
NILFS (loop3): couldn't find nilfs on the device
overlayfs: unrecognized mount option "lowerdir}C/bus" or missing value
overlayfs: unrecognized mount option "lowerdir}C/bus" or missing value
NILFS (loop3): couldn't find nilfs on the device
caif:caif_disconnect_client(): nothing to disconnect
NILFS (loop3): couldn't find nilfs on the device
caif:caif_disconnect_client(): nothing to disconnect
kvm [13319]: vcpu0, guest rIP: 0xcc disabled perfctr wrmsr: 0xc2 data 0x0
---
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syzbot
May 8, 2021, 5:09:19 PM5/8/21
to syzkaller...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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