rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=4544/1/0x4000000000000000 softirq=59189/59189 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=58689, q=479 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:1 Not tainted 6.12.0-rc5-syzkaller-00063-g0fc810ae3ae1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:lock_acquire.part.0+0x10b/0x380 kernel/locking/lockdep.c:5825
Code: 89 e2 44 89 f6 4c 89 ef 65 ff 05 98 dd 97 7e 6a 00 81 e5 00 02 00 00 6a 00 41 0f 94 c1 6a 00 45 0f b6 c9 ff b4 24 f8 00 00 00 <41> 57 44 8b 44 24 2c 8b 4c 24 28 e8 a5 ad ff ff 48 c7 c7 40 d3 6c
RSP: 0018:ffffc90000a18c68 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 1ffff92000143192 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888060487300
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff905f520f R11: 0000000000000000 R12: 0000000000000000
R13: ffff888060487300 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f03875b4f98 CR3: 0000000036824000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xd8/0xc60 net/sched/sch_taprio.c:924
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1755
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1817
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__local_bh_enable_ip+0xac/0x120 kernel/softirq.c:389
Code: 1d 71 65 b3 7e 65 8b 05 6a 65 b3 7e a9 00 ff ff 00 74 4d bf 01 00 00 00 e8 a1 ab 0b 00 e8 dc b2 44 00 fb 65 8b 05 4c 65 b3 7e <85> c0 74 52 5b 5d c3 cc cc cc cc 65 8b 05 ae 11 b2 7e 85 c0 75 9e
RSP: 0018:ffffc90000117b00 EFLAGS: 00000206
RAX: 0000000080000000 RBX: 00000000fffffe00 RCX: 1ffffffff2dd03a1
RDX: 0000000000000000 RSI: ffffffff8b6cd040 RDI: ffffffff8bd1adc0
RBP: ffffffff8ae71e46 R08: 0000000000000001 R09: fffffbfff2dc55a3
R10: ffffffff96e2ad1f R11: 0000000000000000 R12: ffffffff8ae721f0
R13: ffff888067348d40 R14: 0000000000000000 R15: ffff888060433540
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 batadv_nc_purge_paths+0x1c6/0x390 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x94a/0x1060 net/batman-adv/network-coding.c:722
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 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 timer wakeup didn't happen for 10501 jiffies! g58689 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=26105
rcu: rcu_preempt kthread starved for 10502 jiffies! g58689 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27504 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0xe55/0x5730 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6782
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2615
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247
 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>