INFO: task syz-executor.0:6548 blocked for more than 143 seconds.
Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:22112 pid: 6548 ppid: 1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4987 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6268
schedule+0xd2/0x260 kernel/sched/core.c:6341
blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
__loop_clr_fd+0x1ae/0x1070 drivers/block/loop.c:1122
lo_release+0x1ac/0x1f0 drivers/block/loop.c:1761
blkdev_put_whole block/bdev.c:694 [inline]
blkdev_put+0x2fb/0x9e0 block/bdev.c:956
deactivate_locked_super+0x94/0x160 fs/super.c:335
deactivate_super+0xad/0xd0 fs/super.c:366
cleanup_mnt+0x3a2/0x540 fs/namespace.c:1137
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: 0033:0x7fab1132af57
RSP: 002b:00007fffbace7db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fab1132af57
RDX: 00007fffbace7e8a RSI: 000000000000000a RDI: 00007fffbace7e80
RBP: 00007fffbace7e80 R08: 00000000ffffffff R09: 00007fffbace7c50
R10: 00005555557ed903 R11: 0000000000000246 R12: 00007fab11383105
R13: 00007fffbace8f40 R14: 00005555557ed810 R15: 00007fffbace8f80
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb83ba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
2 locks held by kworker/u4:3/90:
#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+0x173/0x490 kernel/sched/psi.c:871
1 lock held by in:imklog/6289:
#0: ffff88806ff32ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
3 locks held by rs:main Q:Reg/6290:
#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: ffffffff8bb83ba0 (rcu_read_lock){....}-{1:2}, at: trace_sched_stat_runtime include/trace/events/sched.h:517 [inline]
#2: ffffffff8bb83ba0 (rcu_read_lock){....}-{1:2}, at: update_curr+0x370/0x900 kernel/sched/fair.c:876
2 locks held by syz-executor.0/6548:
#0: ffff88801a434118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x97/0x9e0 block/bdev.c:914
#1: ffff8881473f6b60 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0x7a/0x1070 drivers/block/loop.c:1106
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc1-next-20211118-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:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:339
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: 1319 Comm: kworker/u4:5 Not tainted 5.16.0-rc1-next-20211118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:lock_acquire+0xc/0x510 kernel/locking/lockdep.c:5605
Code: e9 b7 fe ff ff 48 c7 c7 08 1c 91 8d e8 8d b3 61 00 e9 fb fe ff ff 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 57 <41> 89 f7 41 56 49 89 fe 41 55 41 89 d5 41 54 41 89 cc 55 44 89 c5
RSP: 0018:ffffc9000598f9a0 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffc90005988000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880b9d39a98
RBP: ffff8880b9d39a80 R08: 0000000000000001 R09: 0000000000000000
R10: fffffbfff1b21cfa R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880b9d39a80 R14: ffff88801cf2d600 R15: ffff888010c69800
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbb4f272000 CR3: 000000000b88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
_raw_spin_lock_nested+0x30/0x40 kernel/locking/spinlock.c:368
raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478
raw_spin_rq_lock kernel/sched/sched.h:1318 [inline]
rq_lock kernel/sched/sched.h:1616 [inline]
__schedule+0x242/0x4940 kernel/sched/core.c:6182
schedule+0xd2/0x260 kernel/sched/core.c:6341
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
toggle_allocation_gate mm/kfence/core.c:739 [inline]
toggle_allocation_gate+0x305/0x390 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):
0: e9 b7 fe ff ff jmpq 0xfffffebc
5: 48 c7 c7 08 1c 91 8d mov $0xffffffff8d911c08,%rdi
c: e8 8d b3 61 00 callq 0x61b39e
11: e9 fb fe ff ff jmpq 0xffffff11
16: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
1d: 00
1e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
25: fc ff df
28: 41 57 push %r15
* 2a: 41 89 f7 mov %esi,%r15d <-- trapping instruction
2d: 41 56 push %r14
2f: 49 89 fe mov %rdi,%r14
32: 41 55 push %r13
34: 41 89 d5 mov %edx,%r13d
37: 41 54 push %r12
39: 41 89 cc mov %ecx,%r12d
3c: 55 push %rbp
3d: 44 89 c5 mov %r8d,%ebp