INFO: task syz-executor216:26240 blocked for more than 143 seconds.
      Not tainted 5.15.0-rc5-next-20211015-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor216 state:D stack:27672 pid:26240 ppid:  6558 flags:0x00020004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4965 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6246
 schedule+0xd2/0x260 kernel/sched/core.c:6319
 io_uring_cancel_generic+0x53d/0x690 fs/io_uring.c:9825
 io_uring_files_cancel include/linux/io_uring.h:16 [inline]
 do_exit+0x60e/0x2b40 kernel/exit.c:787
 do_group_exit+0x125/0x310 kernel/exit.c:929
 __do_sys_exit_group kernel/exit.c:940 [inline]
 __se_sys_exit_group kernel/exit.c:938 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:938
 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: 0033:0x7f6abe20b889
RSP: 002b:00007ffc93ce6918 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f6abe2803f0 RCX: 00007f6abe20b889
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc4 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6abe2803f0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb82ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by in:imklog/6242:
 #0: ffff88801ff46d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc5-next-20211015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __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: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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6551 Comm: kworker/u4:0 Not tainted 5.15.0-rc5-next-20211015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:debug_lockdep_rcu_enabled+0x2b/0x30 kernel/rcu/update.c:282
Code: 05 ba 72 42 04 85 c0 74 21 8b 05 cc a5 42 04 85 c0 74 17 65 48 8b 04 25 40 70 02 00 8b 80 64 0a 00 00 85 c0 0f 94 c0 0f b6 c0 <c3> cc cc cc cc 41 54 55 48 c7 c5 08 aa 03 00 53 89 fb e8 de 0c 00
RSP: 0018:ffffc90001d4f970 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8134c3e1
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff8d8fd290
RBP: ffff888010e68000 R08: 0000000000000000 R09: ffffffff8d8fd297
R10: fffffbfff1b1fa52 R11: 000000000000003f R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000023e4a
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff983d56000 CR3: 00000001406f4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_read_lock_held_common kernel/rcu/update.c:104 [inline]
 rcu_read_lock_sched_held+0xd/0x70 kernel/rcu/update.c:123
 trace_tlb_flush include/trace/events/tlb.h:38 [inline]
 trace_tlb_flush+0x126/0x1b0 include/trace/events/tlb.h:38
 switch_mm_irqs_off+0x4a4/0xa10 arch/x86/mm/tlb.c:629
 use_temporary_mm arch/x86/kernel/alternative.c:741 [inline]
 __text_poke+0x44a/0x8c0 arch/x86/kernel/alternative.c:838
 text_poke_bp_batch+0x3d7/0x560 arch/x86/kernel/alternative.c:1178
 text_poke_flush arch/x86/kernel/alternative.c:1268 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:1265 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830
 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177
 static_key_enable+0x16/0x20 kernel/jump_label.c:190
 toggle_allocation_gate mm/kfence/core.c:731 [inline]
 toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:723
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.233 msecs
----------------
Code disassembly (best guess):
   0:	05 ba 72 42 04       	add    $0x44272ba,%eax
   5:	85 c0                	test   %eax,%eax
   7:	74 21                	je     0x2a
   9:	8b 05 cc a5 42 04    	mov    0x442a5cc(%rip),%eax        # 0x442a5db
   f:	85 c0                	test   %eax,%eax
  11:	74 17                	je     0x2a
  13:	65 48 8b 04 25 40 70 	mov    %gs:0x27040,%rax
  1a:	02 00
  1c:	8b 80 64 0a 00 00    	mov    0xa64(%rax),%eax
  22:	85 c0                	test   %eax,%eax
  24:	0f 94 c0             	sete   %al
  27:	0f b6 c0             	movzbl %al,%eax
* 2a:	c3                   	retq <-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	41 54                	push   %r12
  31:	55                   	push   %rbp
  32:	48 c7 c5 08 aa 03 00 	mov    $0x3aa08,%rbp
  39:	53                   	push   %rbx
  3a:	89 fb                	mov    %edi,%ebx
  3c:	e8                   	.byte 0xe8
  3d:	de 0c 00             	fimuls (%rax,%rax,1)