INFO: task syz-executor.0:6528 blocked for more than 143 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:26128 pid: 6528 ppid:  3658 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4986 [inline]
 __schedule+0xab2/0x4f00 kernel/sched/core.c:6296
 schedule+0xd2/0x260 kernel/sched/core.c:6369
 perf_event_free_task+0x518/0x6c0 kernel/events/core.c:12868
 copy_process+0x2f5e/0x7310 kernel/fork.c:2432
 kernel_clone+0xe7/0xab0 kernel/fork.c:2556
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2673
 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: 0033:0x7fe54746f2e1
RSP: 002b:00007fe547ab4a68 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fe545d5f700 RCX: 00007fe54746f2e1
RDX: 00007fe545d5f9d0 RSI: 00007fe545d5f2f0 RDI: 00000000003d0f00
RBP: 00007fe547ab4cb0 R08: 00007fe545d5f700 R09: 00007fe545d5f700
R10: 00007fe545d5f9d0 R11: 0000000000000206 R12: 00007fe547ab4b1e
R13: 00007fe547ab4b1f R14: 00007fe545d5f300 R15: 0000555555f49ca0
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u4:0/8:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb851e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460
2 locks held by getty/3283:
 #0: ffff88814b10b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffffc90002b962e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2077

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-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: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:210 [inline]
 watchdog+0xc1d/0xf50 kernel/hung_task.c:295
 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: 8 Comm: kworker/u4:0 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:lock_release+0x403/0x720 kernel/locking/lockdep.c:5663
Code: 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df 48 01 c5 48 c7 45 00 00 00 00 00 c7 45 08 00 00 00 00 <48> 8b 84 24 88 00 00 00 65 48 2b 04 25 28 00 00 00 0f 85 58 02 00
RSP: 0018:ffffc90000cd7b48 EFLAGS: 00000282
RAX: dffffc0000000000 RBX: 529a31cdcb5411b3 RCX: ffffc90000cd7b98
RDX: 1ffff110021cfc2a RSI: 0000000000000201 RDI: 0000000000000000
RBP: fffff5200019af6b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000003 R14: ffff888010e7e158 R15: ffff888010e7d700
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055750b2d0018 CR3: 0000000022f22000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:165 [inline]
 _raw_spin_unlock_bh+0x12/0x30 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:394 [inline]
 batadv_nc_purge_paths+0x2a5/0x3a0 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x930/0xfa0 net/batman-adv/network-coding.c:722
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	01 00                	add    %eax,(%rax)
   2:	00 48 f7             	add    %cl,-0x9(%rax)
   5:	04 24                	add    $0x24,%al
   7:	00 02                	add    %al,(%rdx)
   9:	00 00                	add    %al,(%rax)
   b:	74 01                	je     0xe
   d:	fb                   	sti
   e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  15:	fc ff df
  18:	48 01 c5             	add    %rax,%rbp
  1b:	48 c7 45 00 00 00 00 	movq   $0x0,0x0(%rbp)
  22:	00
  23:	c7 45 08 00 00 00 00 	movl   $0x0,0x8(%rbp)
* 2a:	48 8b 84 24 88 00 00 	mov    0x88(%rsp),%rax <-- trapping instruction
  31:	00
  32:	65 48 2b 04 25 28 00 	sub    %gs:0x28,%rax
  39:	00 00
  3b:	0f                   	.byte 0xf
  3c:	85 58 02             	test   %ebx,0x2(%rax)