INFO: task systemd-udevd:8616 blocked for more than 143 seconds.
Not tainted 5.15.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-udevd state:D stack:27160 pid: 8616 ppid: 2970 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4969 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6250
schedule+0xd2/0x260 kernel/sched/core.c:6323
blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
lo_release+0x160/0x1f0 drivers/block/loop.c:1768
blkdev_put_whole block/bdev.c:694 [inline]
blkdev_put+0x2fb/0x9e0 block/bdev.c:956
blkdev_close+0x6a/0x80 block/fops.c:515
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f26619be270
RSP: 002b:00007fff478113a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f26619be270
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f2662878710 R08: 000055568eb005a0 R09: 000055568eb00300
R10: 00007f26628788c0 R11: 0000000000000246 R12: 0000000000000000
R13: 000055568eb00660 R14: 0000000000000003 R15: 000000000000000e
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb80fe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by in:imklog/6215:
1 lock held by syz-executor.2/29733:
#0: ffff88801acd2918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
2 locks held by systemd-udevd/8616:
#0: ffff88801acd2918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914
#1: ffff88801ac62360 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:1748
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xc1d/0xf50 kernel/hung_task.c:295
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2952 Comm: systemd-journal Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unwind_next_frame+0x4c/0x1ce0 arch/x86/kernel/unwind_orc.c:418
Code: 40 b3 8a b5 41 48 8d 5c 24 40 48 c7 44 24 48 69 2a 36 8b 48 c1 eb 03 48 c7 44 24 50 a0 3a 34 81 48 8d 14 03 c7 02 f1 f1 f1 f1 42 04 00 f3 f3 f3 48 89 fa 65 48 8b 34 25 28 00 00 00 48 89 b4
RSP: 0018:ffffc9000aca79c0 EFLAGS: 00000a02
RAX: dffffc0000000000 RBX: 1ffff92001594f40 RCX: 0000000000000000
RDX: fffff52001594f40 RSI: ffffffff81bcfe05 RDI: ffffc9000aca7a98
RBP: ffffc9000aca7b20 R08: 0000000000000001 R09: 0000000000000001
R10: fffff52001594f5e R11: 000000000008808a R12: ffffc9000aca7b50
R13: 0000000000000000 R14: ffffc9000aca7a98 R15: ffff88801b5ed600
FS: 00007fee2fe9e8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fee2d71f008 CR3: 0000000077a35000 CR4: 00000000003506f0
DR0: 00000000000043ce DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x85/0xb0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:259 [inline]
slab_post_alloc_hook mm/slab.h:519 [inline]
slab_alloc mm/slab.c:3323 [inline]
kmem_cache_alloc+0x265/0x560 mm/slab.c:3507
prepare_creds+0x3f/0x7b0 kernel/cred.c:260
access_override_creds fs/open.c:351 [inline]
do_faccessat+0x3f4/0x850 fs/open.c:415
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fee2f1599c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcbd2e0ca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffcbd2e3cd0 RCX: 00007fee2f1599c7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055fde38d69a3
RBP: 00007ffcbd2e0df0 R08: 000055fde38cc3e5 R09: 0000000000000018
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 000055fde42f68c0 R15: 00007ffcbd2e12e0
----------------
Code disassembly (best guess):
0: 40 b3 8a mov $0x8a,%bl
3: b5 41 mov $0x41,%ch
5: 48 8d 5c 24 40 lea 0x40(%rsp),%rbx
a: 48 c7 44 24 48 69 2a movq $0xffffffff8b362a69,0x48(%rsp)
11: 36 8b
13: 48 c1 eb 03 shr $0x3,%rbx
17: 48 c7 44 24 50 a0 3a movq $0xffffffff81343aa0,0x50(%rsp)
1e: 34 81
20: 48 8d 14 03 lea (%rbx,%rax,1),%rdx
24: c7 02 f1 f1 f1 f1 movl $0xf1f1f1f1,(%rdx)
* 2a: c7 42 04 00 f3 f3 f3 movl $0xf3f3f300,0x4(%rdx) <-- trapping instruction
31: 48 89 fa mov %rdi,%rdx
34: 65 48 8b 34 25 28 00 mov %gs:0x28,%rsi
3b: 00 00
3d: 48 rex.W
3e: 89 .byte 0x89
3f: b4 .byte 0xb4