INFO: task syz-executor.1:16406 blocked for more than 143 seconds.
      Not tainted 5.12.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:26896 pid:16406 ppid:  8421 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4324 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5075
 schedule+0xcf/0x270 kernel/sched/core.c:5154
 io_uring_cancel_files fs/io_uring.c:8699 [inline]
 io_uring_cancel_task_requests+0x9d9/0xc40 fs/io_uring.c:8730
 __io_uring_files_cancel+0x110/0x1b0 fs/io_uring.c:8816
 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:00007f7db8584188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000000001 RBX: 000000000056bf60 RCX: 0000000000465f69
RDX: 0000000000000000 RSI: 00000000000045f5 RDI: 0000000000000006
RBP: 00000000004bfa67 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffc51e5d47f R14: 00007f7db8584300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1665:
 #0: ffffffff8bf74220 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327
1 lock held by in:imklog/8113:
 #0: ffff88801327b4f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961

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

NMI backtrace for cpu 0
CPU: 0 PID: 1665 Comm: khungtaskd Not tainted 5.12.0-rc2-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:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd48/0xfb0 kernel/hung_task.c:294
 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: 527 Comm: kworker/u4:5 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy9 ieee80211_iface_work
RIP: 0010:mark_held_locks+0x72/0xe0 kernel/locking/lockdep.c:4071
Code: 00 00 fc ff df 4d 8d b4 24 90 09 00 00 85 c0 7e 57 48 63 c3 48 8d 04 80 49 8d 34 c6 48 8d 7e 22 48 89 f8 48 89 fa 48 c1 e8 03 <83> e2 07 42 0f b6 04 28 38 d0 7f 04 84 c0 75 4a 0f b6 46 22 89 c2
RSP: 0018:ffffc900029dfaf8 EFLAGS: 00000016
RAX: 1ffff110024a4ba3 RBX: 0000000000000001 RCX: 1ffffffff1f5f422
RDX: ffff888012525d1a RSI: ffff888012525cf8 RDI: ffff888012525d1a
RBP: 0000000000000006 R08: 0000000000000000 R09: ffffffff8fa9e957
R10: 0000000000000001 R11: 000000000000003f R12: ffff888012525340
R13: dffffc0000000000 R14: ffff888012525cd0 R15: ffff888010441c80
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f15ecb0a010 CR3: 000000001ba4a000 CR4: 0000000000350ee0
Call Trace:
 __trace_hardirqs_on_caller kernel/locking/lockdep.c:4105 [inline]
 lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4165 [inline]
 lockdep_hardirqs_on_prepare+0x28b/0x400 kernel/locking/lockdep.c:4117
 trace_hardirqs_on+0x5b/0x1c0 kernel/trace/trace_preemptirq.c:49
 slab_free_hook mm/slub.c:1550 [inline]
 slab_free_freelist_hook+0xee/0x210 mm/slub.c:1600
 slab_free mm/slub.c:3161 [inline]
 kfree+0xe5/0x7f0 mm/slub.c:4213
 skb_free_head net/core/skbuff.c:650 [inline]
 skb_release_data+0x622/0x750 net/core/skbuff.c:671
 skb_release_all net/core/skbuff.c:725 [inline]
 __kfree_skb net/core/skbuff.c:739 [inline]
 kfree_skb net/core/skbuff.c:757 [inline]
 kfree_skb+0x133/0x3f0 net/core/skbuff.c:751
 ieee80211_iface_work+0x2cf/0x9e0 net/mac80211/iface.c:1451
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
 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