rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P960/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=23573, q=599 ncpus=2)
task:kworker/u8:6    state:R  running task     stack:24608 pid:960   tgid:960   ppid:2      flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:batadv_iv_ogm_schedule_buff+0xc53/0x1500 net/batman-adv/bat_iv_ogm.c:843
Code: 94 0f 84 dc 02 00 00 e8 bb a5 e4 f6 48 8d 7b 78 48 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 0b 08 00 00 41 80 3f 00 48 8b 6b 78 <0f> 85 07 08 00 00 49 3b 6d 78 75 aa e8 8c a5 e4 f6 4c 8d 63 20 be
RSP: 0018:ffffc90004c2fb60 EFLAGS: 00000246
RAX: 1ffff1100bbce90f RBX: ffff88805de74800 RCX: ffffffff8aa9493f
RDX: ffff888021b03c00 RSI: ffffffff8aa94695 RDI: ffff88805de74878
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000007 R11: ffffffff8b2f25e0 R12: ffff88805fd56020
R13: ffff88805f5a9800 R14: dffffc0000000000 R15: ffffed100beb530f
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:868 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:861 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x31e/0x8d0 net/batman-adv/bat_iv_ogm.c:1712
 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: rcu_preempt kthread starved for 10529 jiffies! g23573 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27680 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6505 Comm: syz-executor.4 Not tainted 6.9.0-syzkaller-10323-g8f6a15f095a6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3762 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3782 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3837 [inline]
RIP: 0010:__lock_acquire+0x1530/0x3b30 kernel/locking/lockdep.c:5137
Code: c3 48 c1 e8 2f 49 89 c4 48 8d 04 c5 e0 91 15 94 48 89 c2 48 89 44 24 10 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 7a 21 00 00 48 bd 00 00 00 00 00 fc ff df 4c 8b 6c 24 08 4a
RSP: 0018:ffffc900031f7ac8 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: e91b78abf4a04936 RCX: ffffffff816aea9e
RDX: 1ffffffff28444a0 RSI: 0000000000000008 RDI: ffffffff94271290
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff284e252
R10: ffffffff94271297 R11: 0000000000000000 R12: 0000000000019264
R13: 00000000000000b2 R14: ffff8880240e64e0 R15: 0000000000000004
FS:  00007fc7f8aaa6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c003467304 CR3: 000000007b5a2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
 spin_lock_irq include/linux/spinlock.h:376 [inline]
 __set_current_blocked kernel/signal.c:3099 [inline]
 set_current_blocked kernel/signal.c:3085 [inline]
 signal_delivered kernel/signal.c:2947 [inline]
 signal_setup_done+0x27d/0x570 kernel/signal.c:2959
 handle_signal arch/x86/kernel/signal.c:285 [inline]
 arch_do_signal_or_restart+0x4bb/0x7e0 arch/x86/kernel/signal.c:312
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x14a/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc7f7ca4670
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 3a 9b 04 00 e8 25 78 fa ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007fc7f8aa9bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007fc7f7dabf88 RCX: 00007fc7f7c7cee9
RDX: 00007fc7f8aa9bc0 RSI: 00007fc7f8aa9cf0 RDI: 0000000000000021
RBP: 00007fc7f7dabf80 R08: 00007fc7f8aaa6c0 R09: 00007fc7f8aaa6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7f7dabf8c
R13: 000000000000000b R14: 00007ffc65a6b420 R15: 00007ffc65a6b508
 </TASK>