rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 ticks this GP) idle=b8f/1/0x4000000000000002 softirq=28172/28173 fqs=5245 
	(detected by 1, t=10502 jiffies, g=42421, q=1589)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1247 Comm: kworker/u4:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_tt_purge
RIP: 0010:rcu_lock_release+0x18/0x20 include/linux/rcupdate.h:317
Code: 31 c9 68 09 b3 98 81 e8 d6 44 c3 ff 48 83 c4 08 5b c3 53 48 89 fb e8 77 17 df ff e8 72 17 df ff 48 89 df 48 c7 c6 39 b3 98 81 <5b> e9 42 c6 c3 ff 66 90 55 41 57 41 56 41 55 41 54 53 48 89 fb 49
RSP: 0018:ffffc90000007870 EFLAGS: 00000046
RAX: ffffffff8198b33e RBX: ffffffff8c11c460 RCX: ffff8880221d9dc0
RDX: 0000000000000100 RSI: ffffffff8198b339 RDI: ffffffff8c11c460
RBP: ffffc90000007990 R08: dffffc0000000000 R09: ffffed100443b3b9
R10: ffffed100443b3b9 R11: 1ffff1100443b3b8 R12: 00000000ffffffe4
R13: 1ffff92000000f14 R14: ffffc900000078c0 R15: ffffc90000007a80
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000000be8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 __perf_event_output kernel/events/core.c:7813 [inline]
 perf_event_output_forward+0x222/0x280 kernel/events/core.c:7822
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline]
RIP: 0010:handle_softirqs+0x1a9/0x820 kernel/softirq.c:564
Code: 24 78 44 89 64 24 28 0f b7 db 48 c7 c7 40 fe 09 8a e8 bb 87 60 08 65 66 c7 05 71 21 bb 7e 00 00 e8 8c 71 35 00 fb 89 5c 24 34 <b8> ff ff ff ff 0f bc 44 24 34 41 89 c5 41 ff c5 0f 85 c1 00 00 00
RSP: 0018:ffffc90000007ee0 EFLAGS: 00000282
RAX: a6111d1f9cf5b400 RBX: 0000000000000200 RCX: a6111d1f9cf5b400
RDX: dffffc0000000000 RSI: ffffffff8a0b1620 RDI: ffffffff8a59a240
RBP: ffffc90000007fe8 R08: dffffc0000000000 R09: fffffbfff1ff7639
R10: fffffbfff1ff7639 R11: 1ffffffff1ff7638 R12: 000000000000000a
R13: dffffc0000000000 R14: ffff8880221d9dc0 R15: dffffc0000000000
 do_softirq+0x13b/0x200 kernel/softirq.c:477
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x174/0x1b0 kernel/softirq.c:401
 spin_unlock_bh include/linux/spinlock.h:408 [inline]
 batadv_tt_local_purge+0x2a7/0x340 net/batman-adv/translation-table.c:1371
 batadv_tt_purge+0x31/0x9f0 net/batman-adv/translation-table.c:3582
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>