INFO: task syz.7.3998:17479 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.3998      state:D stack:25928 pid:17479 tgid:17478 ppid:12194  task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 __fuse_simple_request+0xf15/0x18d0
 fuse_flush+0x5d4/0x800
 filp_flush+0xbd/0x190
 filp_close+0x1d/0x40
 __se_sys_close_range+0x359/0x650
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff35978eba9
RSP: 002b:00007ff35a5d2038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007ff3599d5fa0 RCX: 00007ff35978eba9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: 00007ff359811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff3599d6038 R14: 00007ff3599d5fa0 R15: 00007ffe44351668
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e33d660 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5675:
 #0: ffff88810a82d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000290e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
1 lock held by syz.4.5018/20328:
2 locks held by syz.8.5020/20338:
 #0: ffff88804b03a018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff88804b024048 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17787 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: bat_events batadv_nc_worker
RIP: 0010:rcu_is_watching+0x6/0xb0
Code: e8 5f 1a 5e 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 <41> 56 53 65 ff 05 90 96 1d 11 e8 7b b1 dd 09 89 c3 83 f8 08 73 65
RSP: 0018:ffffc90000007d88 EFLAGS: 00000093
RAX: 0000000000000000 RBX: 0000000000000806 RCX: ffff88811f2d5700
RDX: 0000000000010000 RSI: ffffffff81adb506 RDI: ffff88804b027ad8
RBP: ffffc90000007e90 R08: ffff88802c181357 R09: 0000000000000000
R10: ffff88802c181348 R11: ffffed100583026b R12: dffffc0000000000
R13: ffffffff81adb506 R14: ffff88804b027ad8 R15: 1ffff92000000fc0
FS:  0000000000000000(0000) GS:ffff8880b83e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 0000000028668000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_release+0x4b/0x3e0
 _raw_spin_unlock_irqrestore+0x70/0x110
 hrtimer_interrupt+0x616/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 cb 8f 26 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90007ecf960 EFLAGS: 00000206
RAX: ae4a48ddb3cd5500 RBX: 0000000000000000 RCX: ae4a48ddb3cd5500
RDX: 0000000000000000 RSI: ffffffff8ddb221c RDI: ffffffff8c038200
RBP: ffffffff8b519ec2 R08: 0000000000000000 R09: ffffffff8b519ec2
R10: dffffc0000000000 R11: fffffbfff1f88787 R12: 0000000000000002
R13: ffffffff8e33d660 R14: 0000000000000000 R15: 0000000000000246
 batadv_nc_worker+0xef/0x610
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
