INFO: task syz-executor.0:11073 blocked for more than 143 seconds.
      Not tainted 5.12.0-rc2-next-20210310-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:26168 pid:11073 ppid:  8434 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4353 [inline]
 __schedule+0x90c/0x2150 kernel/sched/core.c:5103
 schedule+0xcf/0x270 kernel/sched/core.c:5182
 io_uring_cancel_files fs/io_uring.c:8678 [inline]
 io_uring_cancel_task_requests+0xc0d/0x1180 fs/io_uring.c:8704
 __io_uring_files_cancel+0x10a/0x1b0 fs/io_uring.c:8812
 io_uring_files_cancel include/linux/io_uring.h:47 [inline]
 do_exit+0x299/0x2a60 kernel/exit.c:780
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x42c/0x2100 kernel/signal.c:2773
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465f69
RSP: 002b:00007fb1bae13188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000000302 RBX: 000000000056bf60 RCX: 0000000000465f69
RDX: 0000000000000000 RSI: 0000000000000302 RDI: 0000000000000004
RBP: 00000000004bfa3f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffd1489e05f R14: 00007fb1bae13300 R15: 0000000000022000

Showing all locks held in the system:
2 locks held by kworker/u4:5/245:
1 lock held by khungtaskd/1657:
 #0: ffffffff8bf74360 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6332
1 lock held by in:imklog/8132:
 #0: ffff88802157e0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1657 Comm: khungtaskd Not tainted 5.12.0-rc2-next-20210310-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
 watchdog+0xd8e/0xf40 kernel/hung_task.c:338
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 245 Comm: kworker/u4:5 Not tainted 5.12.0-rc2-next-20210310-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy13 ieee80211_iface_work
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197
Code: ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 40 00 65 8b 05 19 12 8e 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9
RSP: 0018:ffffc9000114fd18 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000000100 RCX: ffffffff81592663
RDX: 1ffff11002450132 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88802300d5f0 R08: 0000000000000000 R09: ffffffff8fae5957
R10: fffffbfff1f5cb2a R11: 0000000000000000 R12: 0000000000000001
R13: ffff88802300d600 R14: ffff888140e9d700 R15: ffff888010869800
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff4fcd98020 CR3: 000000001384b000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 process_one_work+0x8d8/0x1600 kernel/workqueue.c:2251
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294