INFO: task syz.1.12586:3195 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.12586     state:D stack:24872 pid:3195  tgid:3195  ppid:5862   task_flags:0x400040 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x16d8/0x55e0 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7283
 request_wait_answer fs/fuse/dev.c:590 [inline]
 __fuse_request_send fs/fuse/dev.c:604 [inline]
 __fuse_simple_request+0x127b/0x1d90 fs/fuse/dev.c:699
 fuse_simple_request fs/fuse/fuse_i.h:1262 [inline]
 fuse_flush+0x673/0x8b0 fs/fuse/file.c:500
 filp_flush+0xc0/0x190 fs/open.c:1467
 filp_close+0x1d/0x40 fs/open.c:1480
 __range_close fs/file.c:794 [inline]
 __do_sys_close_range fs/file.c:855 [inline]
 __se_sys_close_range+0x3d6/0x910 fs/file.c:819
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f40f5e9ce59
RSP: 002b:00007fffaf0e83b8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007fffaf0e84a0 RCX: 00007f40f5e9ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000001c901e R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32020000 R11: 0000000000000246 R12: 00007fffaf0e84e0
R13: 00007f40f611609c R14: 00000000001c90b6 R15: 00007f40f6116090
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/38:
 #0: ffffffff8ddc7b60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8ddc7b60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8ddc7b60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5357:
 #0: ffff88803671f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1390 drivers/tty/n_tty.c:2211
3 locks held by kworker/u8:37/29462:
7 locks held by kworker/u8:42/29467:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 29462 Comm: kworker/u8:37 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: bat_events batadv_dat_purge
RIP: 0010:check_preemption_disabled+0x22/0xe0 lib/smp_processor_id.c:53
Code: 90 90 90 90 90 90 90 90 55 41 57 41 56 53 65 8b 05 f7 cd 30 07 65 8b 0d ec cd 30 07 f7 c1 ff ff ff 7f 74 0c 5b 41 5e 41 5f 5d <e9> 09 a3 03 00 cc 9c 59 f7 c1 00 02 00 00 74 ea 65 4c 8b 3d 9e cd
RSP: 0018:ffffc900040df9e0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000283 RCX: 0000000000000046
RDX: 000000008d1f45d7 RSI: ffffffff8d65abe9 RDI: ffffffff8b873ba0
RBP: ffff88803101e888 R08: ffffffff818765ac R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ddc7b60 R12: 0000000000000003
R13: 0000000000000003 R14: ffffffff8dc5ef40 R15: ffff88803101dc40
FS:  0000000000000000(0000) GS:ffff8881263a1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564ae7114168 CR3: 000000000dbb6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
 lock_release+0x259/0x3c0 kernel/locking/lockdep.c:5891
 __local_bh_enable_ip+0x98/0x2b0 kernel/softirq.c:268
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 spin_unlock_bh include/linux/spinlock_rt.h:116 [inline]
 __batadv_dat_purge+0x343/0x400 net/batman-adv/distributed-arp-table.c:185
 batadv_dat_purge+0x20/0x70 net/batman-adv/distributed-arp-table.c:204
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>