rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...0: (1 GPs behind) idle=155/1/0x4000000000000000 softirq=10609/10613 fqs=5250 
	(detected by 0, t=10502 jiffies, g=12677, q=1167)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1255 Comm: kworker/u4:5 Not tainted 5.15.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__lock_release kernel/locking/lockdep.c:5283 [inline]
RIP: 0010:lock_release+0x1d0/0x9a0 kernel/locking/lockdep.c:5643
Code: c7 84 24 80 00 00 00 01 00 00 00 48 c7 c0 94 ba 0a 8e 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 61 05 00 00 83 3d 84 c5 a7 0c 00 <0f> 84 d4 03 00 00 4d 8d b5 e8 0a 00 00 4c 89 f0 48 c1 e8 03 48 89
RSP: 0018:ffffc90000dd0b80 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000046 RCX: ffffc90000dd0c03
RDX: 1ffff920001ba180 RSI: ffffffff8aab3980 RDI: ffffffff8af9f2c0
RBP: ffffc90000dd0cb0 R08: dffffc0000000000 R09: fffffbfff1c150de
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920001ba17c
R13: ffff888023555940 R14: ffffc90000dd0c30 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab33e67f98 CR3: 000000005da37000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_unlock_irqrestore+0x75/0x130 kernel/locking/spinlock.c:194
 __run_hrtimer kernel/time/hrtimer.c:1684 [inline]
 __hrtimer_run_queues+0x48c/0xcf0 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x13b/0x4b0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__rcu_read_unlock+0x0/0x100 kernel/rcu/tree_plugin.h:415
Code: 76 82 5e 00 eb b1 44 89 f9 80 e1 07 80 c1 03 38 c1 7c b0 4c 89 ff e8 ef 81 5e 00 eb a6 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <55> 41 57 41 56 41 55 41 54 53 49 bc 00 00 00 00 00 fc ff df 65 4c
RSP: 0018:ffffc90004d17bf0 EFLAGS: 00000293
RAX: ffffffff8a1c2117 RBX: 0000000000000001 RCX: ffff888023555940
RDX: 0000000000000000 RSI: ffffffff8af9f2a0 RDI: ffffffff8af9f260
RBP: 0000000000000001 R08: ffffffff8a1c2105 R09: fffffbfff2131821
R10: 0000000000000000 R11: dffffc0000000001 R12: 00000000000001df
R13: dffffc0000000000 R14: ffff888076a8cc80 R15: ffff888144b8f340
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:416 [inline]
 batadv_nc_worker+0x234/0x5b0 net/batman-adv/network-coding.c:723
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>