INFO: task syz-executor.1:11496 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:26736 pid:11496 tgid:11489 ppid:5127   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x177f/0x4960 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 perf_event_free_task+0x4bd/0x5c0 kernel/events/core.c:13268
 copy_process+0x2ffc/0x3fb0 kernel/fork.c:2771
 kernel_clone+0x222/0x840 kernel/fork.c:2902
 __do_sys_clone kernel/fork.c:3045 [inline]
 __se_sys_clone kernel/fork.c:3029 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3029
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x450db9
RSP: 002b:00007f7ef7aa60f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 000000000049ba80 RCX: 0000000000450db9
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000002102001ff9
RBP: 00000000ffffffff R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004da5e0
R13: 00007f7ef7aa6674 R14: 0000000000000005 R15: 000000000051bf00
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8d92f120 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8d92f120 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8d92f120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by kworker/u4:12/2906:
 #0: ffff8880b993c918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
 #1: ffff8880b9928988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a7/0x770 kernel/sched/psi.c:976
2 locks held by getty/4803:
 #0: ffff888029dd10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201

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

NMI backtrace for cpu 0
CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: kworker/u4:2 Not tainted 6.8.0-rc2-syzkaller-g1bbb19b6eb1b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:116 [inline]
RIP: 0010:lock_release+0xd7/0x9c0 kernel/locking/lockdep.c:5767
Code: 36 7e 00 48 0f a3 1d 20 95 94 0d 73 0d e8 61 4e 09 00 84 c0 0f 84 cf 05 00 00 48 c7 c0 7c 7b 02 8f 48 c1 e8 03 42 0f b6 04 38 <84> c0 0f 85 dd 05 00 00 83 3d 06 c8 94 0d 00 0f 84 31 05 00 00 65
RSP: 0018:ffffc90000a4f9e0 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff816db340
RDX: 0000000000000000 RSI: ffffffff8bbe9940 RDI: ffffffff8bbe9900
RBP: ffffc90000a4fb18 R08: ffffffff8f02486f R09: 1ffffffff1e0490d
R10: dffffc0000000000 R11: fffffbfff1e0490e R12: 1ffff92000149f48
R13: ffffffff8af52145 R14: ffff888072658230 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c1d3bf000 CR3: 000000002c5fd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 rcu_lock_release include/linux/rcupdate.h:308 [inline]
 rcu_read_unlock include/linux/rcupdate.h:783 [inline]
 batadv_nc_process_nc_paths+0x2f0/0x390 net/batman-adv/network-coding.c:699
 batadv_nc_worker+0x52c/0x610 net/batman-adv/network-coding.c:735
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2706
 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.130 msecs