rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4354/1:b..l
	(detected by 1, t=10503 jiffies, g=10241, q=115 ncpus=2)
task:kworker/u4:6    state:R  running task     stack:25856 pid:4354  ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:215
Code: 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d 80 a4 9e 0c 48 89 de 5b e9 67 53 4f 00 00 00 cc cc 00 00 cc 48 8b 04 24 <65> 48 8b 0d 14 9f 81 7e 65 8b 15 15 9f 81 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90004767bd8 EFLAGS: 00000202
RAX: ffffffff89e1544d RBX: 0000000000000001 RCX: 06c167b864732d00
RDX: ffff8880273f1dc0 RSI: ffffffff8adefac0 RDI: ffffffff8adefa80
RBP: fffffffffffffe38 R08: dffffc0000000000 R09: fffffbfff215c449
R10: fffffbfff215c449 R11: 1ffffffff215c448 R12: dffffc0000000000
R13: ffffffff89e1530e R14: ffff88801e69cc80 R15: 00000000000000b7
 rcu_read_unlock include/linux/rcupdate.h:820 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0x20d/0x600 net/batman-adv/network-coding.c:719
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: rcu_preempt kthread starved for 10499 jiffies! g10241 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:27840 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 4486 Comm: syz.1.24 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 2e 0f 1f 84 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d 80 a4 9e 0c 48 89 de 5b e9 67 53 4f 00 00 00 cc cc 00 00 cc <48> 8b 04 24 65 48 8b 0d 14 9f 81 7e 65 8b 15 15 9f 81 7e 81 e2 00
RSP: 0018:ffffc90004edfb58 EFLAGS: 00000297
RAX: ffffffff8150feba RBX: dffffc0000000000 RCX: 0000000000000002
RDX: ffff888024f30000 RSI: 0000000000000020 RDI: 0000000000000040
RBP: ffffc90004edfcb0 R08: dffffc0000000000 R09: ffffed1002ee5981
R10: ffffed1002ee5981 R11: 1ffff11002ee5980 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000020
FS:  00007fe4c155b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 0000000054f61000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sigaddset include/linux/signal.h:68 [inline]
 signal_delivered kernel/signal.c:2906 [inline]
 signal_setup_done+0x219/0x440 kernel/signal.c:2919
 handle_signal arch/x86/kernel/signal.c:846 [inline]
 arch_do_signal_or_restart+0xeba/0x1230 arch/x86/kernel/signal.c:873
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe4c07b7320
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 4a 3e 08 00 e8 f5 8f f8 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:00007fe4c155aa78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fe4c09c5fa0 RCX: 00007fe4c078ebe9
RDX: 00007fe4c155aa80 RSI: 00007fe4c155abb0 RDI: 0000000000000021
RBP: 00007fe4c0811e19 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe4c09c6038 R14: 00007fe4c09c5fa0 R15: 00007ffc72371b58
 </TASK>