INFO: task systemd-udevd:2973 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:22616 pid: 2973 ppid: 1 flags:0x00000004
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: 0033:0x7f77516e3270
RSP: 002b:00007ffc3d24ef28 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007ffc3d24efc0 RCX: 00007f77516e3270
RDX: 0000000000000000 RSI: 000000000000125f RDI: 000000000000000e
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000010
R10: 00005573a6190480 R11: 0000000000000246 R12: 00007ffc3d24f0d0
R13: 00005573a6181010 R14: 00005573a6182170 R15: 00007ffc3d24efa0
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8b983b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
2 locks held by systemd-udevd/2973:
#0: ffff88801a588118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914
#1: ffff88801a4e3b60 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:1748
1 lock held by in:imklog/6223:
#0: ffff88801e826ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
1 lock held by syz-executor.2/14278:
#0: ffff88801a588118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
1 lock held by syz-executor.2/14335:
#0: ffff88801a588118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb50 block/bdev.c:819
=============================================
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: 14 Comm: rcu_preempt Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0xc/0x70 kernel/kcov.c:293
Code: 4c 38 f0 48 c7 44 38 e0 05 00 00 00 48 89 74 38 e8 4e 89 54 c8 20 48 89 10 c3 0f 1f 40 00 49 89 f8 bf 03 00 00 00 4c 8b 14 24 <48> 89 f1 65 48 8b 34 25 40 70 02 00 e8 a3 f8 ff ff 84 c0 74 48 48
RSP: 0018:ffffc90000d37b38 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffc90000d37cc0 RCX: 0000000000000000
RDX: 1ffff1101738505a RSI: 0000000000000001 RDI: 0000000000000003
RBP: ffff8880b9c28280 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8166cf7c R11: 0000000000000000 R12: 0000000000000001
R13: 00000001000038e9 R14: 000000000a400000 R15: ffffc90000d37ce0
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c79aa8c920 CR3: 000000000b68e000 CR4: 0000000000350ef0
Call Trace:
enqueue_timer+0x1dc/0x5c0 kernel/time/timer.c:593
internal_add_timer kernel/time/timer.c:611 [inline]
__mod_timer+0x825/0xe30 kernel/time/timer.c:1062
schedule_timeout+0x145/0x2a0 kernel/time/timer.c:1880
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: 4c 38 f0 rex.WR cmp %r14b,%al
3: 48 c7 44 38 e0 05 00 movq $0x5,-0x20(%rax,%rdi,1)
a: 00 00
c: 48 89 74 38 e8 mov %rsi,-0x18(%rax,%rdi,1)
11: 4e 89 54 c8 20 mov %r10,0x20(%rax,%r9,8)
16: 48 89 10 mov %rdx,(%rax)
19: c3 retq
1a: 0f 1f 40 00 nopl 0x0(%rax)
1e: 49 89 f8 mov %rdi,%r8
21: bf 03 00 00 00 mov $0x3,%edi
26: 4c 8b 14 24 mov (%rsp),%r10
* 2a: 48 89 f1 mov %rsi,%rcx <-- trapping instruction
2d: 65 48 8b 34 25 40 70 mov %gs:0x27040,%rsi
34: 02 00
36: e8 a3 f8 ff ff callq 0xfffff8de
3b: 84 c0 test %al,%al
3d: 74 48 je 0x87
3f: 48 rex.W