rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11/1:b..l
	(detected by 0, t=10503 jiffies, g=9781, q=213 ncpus=2)
task:kworker/u4:1    state:R  running task     stack:21240 pid:11    ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x26f/0x5a0 kernel/locking/lockdep.c:5666
Code: 2b 00 74 08 4c 89 f7 e8 4f 7a 77 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90000107a20 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000020f50 RCX: 1ffff92000020ef0
RDX: dffffc0000000000 RSI: ffffffff8aec1440 RDI: ffffffff8b3d75c0
RBP: ffffc90000107b70 R08: dffffc0000000000 R09: fffffbfff2097c4d
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000020f4c
R13: dffffc0000000000 R14: ffffc90000107a80 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 rcu_read_lock include/linux/rcupdate.h:791 [inline]
 batadv_nc_process_nc_paths+0xd6/0x390 net/batman-adv/network-coding.c:687
 batadv_nc_worker+0x426/0x610 net/batman-adv/network-coding.c:728
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: rcu_preempt kthread starved for 10531 jiffies! g9781 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26712 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 4168 Comm: syz-executor.0 Not tainted 6.1.114-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 91 b9 f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 2e 45 d2 f6 48 89 df e8 26 83 d3 f6 e8 31 da f8 f6 fb bf 01 00 00 00 <e8> 26 0d c6 f6 65 8b 05 87 f5 69 75 85 c0 74 02 5b c3 e8 34 19 68
RSP: 0018:ffffc9000528fb30 EFLAGS: 00000286
RAX: 93bd33be4a71e700 RBX: ffff888021d30000 RCX: ffffffff91ca2103
RDX: dffffc0000000000 RSI: ffffffff8aec02c0 RDI: 0000000000000001
RBP: ffffc9000528fc70 R08: dffffc0000000000 R09: ffffed10043a6001
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff110043a6093
R13: 000000001c000004 R14: 0000000000000021 R15: ffff888021d30498
FS:  00007f7c1e7166c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c1e715f80 CR3: 00000000621d3000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x154b/0x17d0 kernel/signal.c:2873
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7c1da7cba7
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89
RSP: 002b:00007f7c1e716178 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f7c1db9bf88 RCX: 00007f7c1da7cba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7c1db9bf88
RBP: 00007f7c1db9bf80 R08: 00007f7c1e7166c0 R09: 00007f7c1e7166c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7c1db9bf8c
R13: 000000000000000b R14: 00007ffef2aa96d0 R15: 00007ffef2aa97b8
 </TASK>