INFO: task syz-executor.4:18714 blocked for more than 143 seconds.
      Not tainted 5.10.0-rc4-next-20201123-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:28856 pid:18714 ppid:  8501 flags:0x00004002
Call Trace:
 context_switch kernel/sched/core.c:4316 [inline]
 __schedule+0x896/0x2050 kernel/sched/core.c:5067
 schedule+0xcf/0x270 kernel/sched/core.c:5146
 io_uring_cancel_files fs/io_uring.c:8745 [inline]
 io_uring_cancel_task_requests fs/io_uring.c:8797 [inline]
 __io_uring_files_cancel+0xc4d/0x14b0 fs/io_uring.c:8893
 io_uring_files_cancel include/linux/io_uring.h:51 [inline]
 exit_files+0xe4/0x170 fs/file.c:456
 do_exit+0xb61/0x29f0 kernel/exit.c:818
 do_group_exit+0x125/0x310 kernel/exit.c:920
 get_signal+0x3ec/0x2010 kernel/signal.c:2770
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:144 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x124/0x200 kernel/entry/common.c:198
 syscall_exit_to_user_mode+0x36/0x260 kernel/entry/common.c:275
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
RSP: 002b:00007fdf6176fcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000118bf28 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118bf28
RBP: 000000000118bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffeac7b4c8f R14: 00007fdf617709c0 R15: 000000000118bf2c

Showing all locks held in the system:
1 lock held by khungtaskd/1658:
 #0: ffffffff8b339e60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254
1 lock held by in:imklog/8193:
 #0: ffff888023f80370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932

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

NMI backtrace for cpu 1
CPU: 1 PID: 1658 Comm: khungtaskd Not tainted 5.10.0-rc4-next-20201123-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+0x107/0x163 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+0xd89/0xf30 kernel/hung_task.c:338
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 201 Comm: kworker/u4:5 Not tainted 5.10.0-rc4-next-20201123-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy5 ieee80211_iface_work
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:437 [inline]
RIP: 0010:lock_is_held_type+0xac/0x100 kernel/locking/lockdep.c:5477
Code: 41 83 fe ff 41 bc 01 00 00 00 74 12 41 0f b6 47 22 45 31 e4 83 e0 03 44 39 f0 41 0f 94 c4 48 c7 c7 e0 6d 4b 89 e8 f4 0c 00 00 <b8> ff ff ff ff 65 0f c1 05 f7 13 18 77 83 f8 01 75 23 ff 34 24 9d
RSP: 0018:ffffc9000179eea8 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 1ffffffff19db103
RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000
RBP: ffff888021108170 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888011882430 R14: 00000000ffffffff R15: ffff8880118824a8
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1142904028 CR3: 00000000258dc000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_is_held include/linux/lockdep.h:271 [inline]
 cfg80211_update_known_bss+0x5be/0xa60 net/wireless/scan.c:1596
 cfg80211_bss_update+0xef/0x1c90 net/wireless/scan.c:1700
 cfg80211_inform_single_bss_frame_data+0x6dc/0xe80 net/wireless/scan.c:2399
 cfg80211_inform_bss_frame_data+0xa7/0xb00 net/wireless/scan.c:2432
 ieee80211_bss_info_update+0x3ce/0xb70 net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1126 [inline]
 ieee80211_rx_mgmt_probe_beacon+0xc77/0x1690 net/mac80211/ibss.c:1615
 ieee80211_ibss_rx_queued_mgmt+0xe3e/0x1870 net/mac80211/ibss.c:1642
 ieee80211_iface_work+0x7ed/0xa90 net/mac80211/iface.c:1421
 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296