rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=299c/1/0x4000000000000000 softirq=99443/99443 fqs=0
rcu: 	(detected by 1, t=10506 jiffies, g=93541, q=122 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6594 Comm: kworker/u8:19 Not tainted 6.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:mark_lock+0xfa/0xc60 kernel/locking/lockdep.c:4712
Code: a7 09 00 00 4c 89 ee 48 23 70 60 ba 01 00 00 00 0f 84 1a 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 01 f8 48 c7 00 00 00 00 00 <c7> 40 08 00 00 00 00 48 c7 40 10 00 00 00 00 48 8b 84 24 08 01 00
RSP: 0000:ffffc900000079a0 EFLAGS: 00000086
RAX: fffff52000000f3a RBX: ffff888079005410 RCX: 1ffffffff2dd8628
RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffffff96ec3140
RBP: ffffc90000007ae0 R08: 0000000000000000 R09: fffffbfff2dd8598
R10: ffffffff96ec2cc7 R11: 0000000000000004 R12: ffff888079004880
R13: 0000000000000001 R14: 0000000000000000 R15: 1ffff92000000f3a
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f50fc6c7f98 CR3: 000000005a7f8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000048e5c DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 mark_usage kernel/locking/lockdep.c:4637 [inline]
 __lock_acquire+0x1390/0x3c40 kernel/locking/lockdep.c:5182
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x13b/0x370 lib/debugobjects.c:873
 debug_hrtimer_deactivate kernel/time/hrtimer.c:460 [inline]
 debug_deactivate kernel/time/hrtimer.c:502 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1769 [inline]
 __hrtimer_run_queues+0x47c/0xae0 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927
 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:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0xd/0xc0 kernel/rcu/tree.c:716
Code: 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 65 ff 05 db 54 64 7e <e8> 6e c8 b7 09 48 c7 c3 28 7c 03 00 83 f8 07 89 c5 0f 87 82 00 00
RSP: 0000:ffffc9000cdf7a48 EFLAGS: 00000283
RAX: 0000000000000001 RBX: 1ffff920019bef4e RCX: ffffffff8196a0d9
RDX: fffffbfff20c4ac3 RSI: 0000000000000008 RDI: ffffffff90625610
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff20c4ac2
R10: ffffffff90625617 R11: 0000000000000002 R12: ffffffff8e1bcc80
R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x4e2/0x6f0 kernel/locking/lockdep.c:5862
 rcu_lock_release include/linux/rcupdate.h:347 [inline]
 rcu_read_unlock include/linux/rcupdate.h:880 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0x88c/0x1060 net/batman-adv/network-coding.c:719
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g93541 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=89184
rcu: rcu_preempt kthread starved for 10506 jiffies! g93541 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28208 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6857
 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>