INFO: task syz.2.2040:14998 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc4-next-20250704-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2040      state:D stack:25096 pid:14998 tgid:14998 ppid:5856   task_flags:0x400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5318 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6701
 __schedule_loop kernel/sched/core.c:6779 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6794
 request_wait_answer fs/fuse/dev.c:566 [inline]
 __fuse_request_send fs/fuse/dev.c:580 [inline]
 __fuse_simple_request+0xf15/0x18d0 fs/fuse/dev.c:674
 fuse_simple_request fs/fuse/fuse_i.h:1230 [inline]
 fuse_flush+0x5d4/0x800 fs/fuse/file.c:475
 filp_flush+0xba/0x190 fs/open.c:1546
 filp_close+0x1d/0x40 fs/open.c:1559
 __range_close fs/file.c:767 [inline]
 __do_sys_close_range fs/file.c:826 [inline]
 __se_sys_close_range+0x359/0x650 fs/file.c:790
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fed9138e929
RSP: 002b:00007ffe1b854fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 0000000000061a61 RCX: 00007fed9138e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fed915b7ba0 R08: 0000000000000001 R09: 0000000c1b8552df
R10: 00007fed91200000 R11: 0000000000000246 R12: 00007fed915b5fac
R13: 00007fed915b5fa0 R14: ffffffffffffffff R15: 00007ffe1b855100
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e53bf60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e53bf60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e53bf60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by getty/5608:
 #0: ffff8880301e90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
2 locks held by kworker/0:6/10032:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc4-next-20250704-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:470
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted 6.16.0-rc4-next-20250704-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:batadv_nc_purge_paths+0x384/0x3b0 net/batman-adv/network-coding.c:473
Code: 80 c1 03 38 c1 7c cf 4c 89 ff e8 07 10 d7 f6 eb c5 e8 40 73 72 f6 eb 05 e8 39 73 72 f6 48 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f <5d> e9 46 a8 34 00 cc 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c a9 fc
RSP: 0018:ffffc90000127a10 EFLAGS: 00000286
RAX: ffffffff8b4d8d40 RBX: 1ffff1100f39f315 RCX: ffff88801d2b0000
RDX: 0000000000000000 RSI: ffffffff8dc833a8 RDI: ffffffff8c04be80
RBP: 0000000000000000 R08: ffffffff8fe37f37 R09: 1ffffffff1fc6fe6
R10: dffffc0000000000 R11: fffffbfff1fc6fe7 R12: dffffc0000000000
R13: ffff88802561b850 R14: ffff888079cf8d80 R15: ffff888079cf97e0
FS:  0000000000000000(0000) GS:ffff8881258af000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb10780d38 CR3: 000000006636e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 batadv_nc_worker+0x369/0x610 net/batman-adv/network-coding.c:722
 process_one_work kernel/workqueue.c:3239 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3322
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>