INFO: task systemd-udevd:8679 blocked for more than 143 seconds.
Not tainted 5.16.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-udevd state:D stack:27096 pid: 8679 ppid: 2969 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4972 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6253
schedule+0xd2/0x260 kernel/sched/core.c:6326
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: 0033:0x7f22a7469270
RSP: 002b:00007fffd27eadc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f22a7469270
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f22a8323710 R08: 000055749dbfead0 R09: 000055749dc0e700
R10: 00007f22a83238c0 R11: 0000000000000246 R12: 0000000000000000
R13: 000055749dc0ce10 R14: 0000000000000003 R15: 000000000000000e
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb83ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by in:imklog/6215:
#0: ffff88807df3b770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
2 locks held by systemd-udevd/8679:
#0: ffff88801a8c2118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914
#1: ffff88801a5ddb60 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:1748
5 locks held by kworker/u4:13/8963:
1 lock held by syz-executor.2/9552:
#0: ffff88801a8c2118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x24e/0xb50 block/bdev.c:819
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc1-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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7441 Comm: kworker/u4:6 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:__default_send_IPI_dest_field+0x7c/0x130 arch/x86/kernel/apic/ipi.c:173
Code: 00 c3 5f ff f6 c4 10 75 e2 44 89 e7 c1 e7 18 89 3c 25 10 c3 5f ff 89 f0 09 d8 80 cf 04 83 fe 02 0f 44 c3 89 04 25 00 c3 5f ff <48> 83 c4 08 5b 5d 41 5c c3 48 c7 c0 60 4a 56 8b 48 ba 00 00 00 00
RSP: 0018:ffffc9000588f9b0 EFLAGS: 00000006
RAX: 00000000000008fb RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000800 RSI: 00000000000000fb RDI: 0000000001000000
RBP: fffffbffffebf860 R08: 0000000000000000 R09: ffff8880b9d3ab97
R10: ffffffff817e26bd R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efe3c4d5020 CR3: 000000000b88e000 CR4: 0000000000350ee0
Call Trace:
_flat_send_IPI_mask+0x4e/0x60 arch/x86/kernel/apic/apic_flat_64.c:56
smp_call_function_many_cond+0xa33/0xc20 kernel/smp.c:949
on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1135
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:1112 [inline]
text_poke_bp_batch+0x47d/0x560 arch/x86/kernel/alternative.c:1366
text_poke_flush arch/x86/kernel/alternative.c:1451 [inline]
text_poke_flush arch/x86/kernel/alternative.c:1448 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1458
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
jump_label_update+0x1d5/0x430 kernel/jump_label.c:830
static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207
static_key_disable+0x16/0x20 kernel/jump_label.c:215
toggle_allocation_gate mm/kfence/core.c:746 [inline]
toggle_allocation_gate+0x183/0x390 mm/kfence/core.c:724
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess), 4 bytes skipped:
0: f6 c4 10 test $0x10,%ah
3: 75 e2 jne 0xffffffe7
5: 44 89 e7 mov %r12d,%edi
8: c1 e7 18 shl $0x18,%edi
b: 89 3c 25 10 c3 5f ff mov %edi,0xffffffffff5fc310
12: 89 f0 mov %esi,%eax
14: 09 d8 or %ebx,%eax
16: 80 cf 04 or $0x4,%bh
19: 83 fe 02 cmp $0x2,%esi
1c: 0f 44 c3 cmove %ebx,%eax
1f: 89 04 25 00 c3 5f ff mov %eax,0xffffffffff5fc300
* 26: 48 83 c4 08 add $0x8,%rsp <-- trapping instruction
2a: 5b pop %rbx
2b: 5d pop %rbp
2c: 41 5c pop %r12
2e: c3 retq
2f: 48 c7 c0 60 4a 56 8b mov $0xffffffff8b564a60,%rax
36: 48 rex.W
37: ba 00 00 00 00 mov $0x0,%edx