INFO: task systemd-udevd:19393 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:27296 pid:19393 ppid: 2970 flags:0x00000000
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
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385
__mutex_lock_common kernel/locking/mutex.c:680 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
lo_release+0x4d/0x1f0 drivers/block/loop.c:1748
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: 0033:0x7fca1b550270
RSP: 002b:00007fff1523c418 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fca1b550270
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007fca1c40a710 R08: 00005621e40f70b0 R09: 00005621e40f6e00
R10: 00007fca1c40a8c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00005621e40e47c0 R14: 0000000000000003 R15: 000000000000000e
INFO: task syz-executor.2:19577 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:syz-executor.2 state:D stack:28480 pid:19577 ppid: 6709 flags:0x00004004
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
loop_set_status+0x17d/0x930 drivers/block/loop.c:1264
loop_set_status_old+0x148/0x1b0 drivers/block/loop.c:1396
lo_ioctl+0x3e9/0x17c0 drivers/block/loop.c:1566
blkdev_ioctl+0x37a/0x800 block/ioctl.c:609
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
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: 0033:0x7fdb115f8ae9
RSP: 002b:00007fdb0eb4d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdb1170c020 RCX: 00007fdb115f8ae9
RDX: 0000000020000940 RSI: 0000000000004c02 RDI: 0000000000000004
RBP: 00007fdb11652f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdb11c3fb2f R14: 00007fdb0eb4d300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by khungtaskd/26:
#0: ffffffff8bb83a60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by in:imklog/6434:
#0: ffff88801a4705f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
2 locks held by kworker/u4:6/6491:
3 locks held by syz-fuzzer/6527:
#0: ffff8880b9c39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478
#1: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a6/0x490 kernel/sched/psi.c:880
#2: ffffffff8bb83a60 (rcu_read_lock){....}-{1:2}, at: trace_sched_stat_runtime include/trace/events/sched.h:517 [inline]
#2: ffffffff8bb83a60 (rcu_read_lock){....}-{1:2}, at: update_curr+0x370/0x900 kernel/sched/fair.c:876
2 locks held by systemd-udevd/19393:
#0: ffff88801aa73118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914
#1: ffff88801aba9b60 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:1748
1 lock held by syz-executor.2/19577:
#0: ffff88801aba9b60 (&lo->lo_mutex){+.+.}-{3:3}, at: loop_set_status+0x2a/0x930 drivers/block/loop.c:1248
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 26 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2960 Comm: systemd-journal Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lockdep_hardirqs_off+0x2b/0xd0 kernel/locking/lockdep.c:4387
Code: 0d 66 7d 3f 04 85 c9 0f 84 b5 00 00 00 65 8b 05 4b 46 b0 76 a9 00 00 f0 00 55 53 48 89 fb 74 49 8b 15 f9 1f fa 06 85 d2 74 0e <65> 8b 05 8a 4d b0 76 85 c0 75 4e 5b 5d c3 9c 58 f6 c4 02 74 eb e8
RSP: 0018:ffffc900027eff10 EFLAGS: 00000046
RAX: 0000000000000046 RBX: ffffffff8951ef26 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900027eff58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000027
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f59a73d18c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f59a49f7000 CR3: 000000001b34a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__enter_from_user_mode kernel/entry/common.c:19 [inline]
syscall_enter_from_user_mode+0x13/0x70 kernel/entry/common.c:104
do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f59a6669f17
Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00
RSP: 002b:00007ffedb794878 EFLAGS: 00000202 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 000055fbbef991e0 RCX: 00007f59a6669f17
RDX: 00000000ffffffff RSI: 00007ffedb794900 RDI: 000055fbbef991e0
RBP: 0000000000000b90 R08: 000000006194564b R09: 00007ffedb7a8080
R10: 00007ffedb7a8080 R11: 0000000000000202 R12: 00007ffedb794900
R13: 00007ffedb7948f8 R14: 000055fbbea2a958 R15: 0005d0f1b1bb4f72
----------------
Code disassembly (best guess):
0: 0d 66 7d 3f 04 or $0x43f7d66,%eax
5: 85 c9 test %ecx,%ecx
7: 0f 84 b5 00 00 00 je 0xc2
d: 65 8b 05 4b 46 b0 76 mov %gs:0x76b0464b(%rip),%eax # 0x76b0465f
14: a9 00 00 f0 00 test $0xf00000,%eax
19: 55 push %rbp
1a: 53 push %rbx
1b: 48 89 fb mov %rdi,%rbx
1e: 74 49 je 0x69
20: 8b 15 f9 1f fa 06 mov 0x6fa1ff9(%rip),%edx # 0x6fa201f
26: 85 d2 test %edx,%edx
28: 74 0e je 0x38
* 2a: 65 8b 05 8a 4d b0 76 mov %gs:0x76b04d8a(%rip),%eax # 0x76b04dbb <-- trapping instruction
31: 85 c0 test %eax,%eax
33: 75 4e jne 0x83
35: 5b pop %rbx
36: 5d pop %rbp
37: c3 retq
38: 9c pushfq
39: 58 pop %rax
3a: f6 c4 02 test $0x2,%ah
3d: 74 eb je 0x2a
3f: e8 .byte 0xe8