rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5874/1:b..l
	(detected by 1, t=10502 jiffies, g=33057, q=296 ncpus=2)
task:kworker/u4:12   state:R  running task     stack:0     pid:5874  ppid:2      flags:0x00000008
Workqueue: bat_events batadv_nc_worker
Call trace:
 __switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0xddc/0x1b18 kernel/sched/core.c:6561
 preempt_schedule_irq+0x8c/0x1b8 kernel/sched/core.c:6873
 arm64_preempt_schedule_irq+0x44/0x58 arch/arm64/kernel/entry-common.c:265
 __el1_irq arch/arm64/kernel/entry-common.c:474 [inline]
 el1_interrupt+0x3c/0x54 arch/arm64/kernel/entry-common.c:486
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline]
 lock_acquire+0x24c/0x644 kernel/locking/lockdep.c:5665
 rcu_lock_acquire+0x40/0x4c include/linux/rcupdate.h:350
 rcu_read_lock include/linux/rcupdate.h:791 [inline]
 batadv_nc_process_nc_paths+0x9c/0x31c net/batman-adv/network-coding.c:687
 batadv_nc_worker+0x3a8/0x554 net/batman-adv/network-coding.c:728
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
rcu: rcu_preempt kthread starved for 9903 jiffies! g33057 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:0     pid:16    ppid:2      flags:0x00000008
Call trace:
 __switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0xddc/0x1b18 kernel/sched/core.c:6561
 preempt_schedule_common+0xec/0x1a0 kernel/sched/core.c:6730
 preempt_schedule+0x64/0x84 kernel/sched/core.c:6754
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0xa8/0xac kernel/locking/spinlock.c:194
 debug_object_assert_init+0x1f8/0x2c8 lib/debugobjects.c:889
 debug_timer_assert_init kernel/time/timer.c:792 [inline]
 debug_assert_init kernel/time/timer.c:837 [inline]
 try_to_del_timer_sync+0x4c/0x1e8 kernel/time/timer.c:1311
 timer_delete_sync+0x15c/0x20c kernel/time/timer.c:1466
 del_timer_sync include/linux/timer.h:198 [inline]
 schedule_timeout+0x188/0x2c8 kernel/time/timer.c:1966
 rcu_gp_fqs_loop+0x2a8/0x134c kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xc0/0x2f8 kernel/rcu/tree.c:1905
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 8905 Comm: syz.2.1159 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : el0_svc_common+0xa8/0x258 arch/arm64/kernel/syscall.c:107
lr : local_daif_restore arch/arm64/include/asm/daifflags.h:75 [inline]
lr : el0_svc_common+0x9c/0x258 arch/arm64/kernel/syscall.c:105
sp : ffff800022b37de0
x29: ffff800022b37de0 x28: ffff0000c8af8000 x27: 0000000000000021
x26: 1fffe0001915f000 x25: 1ffff00004566fd6 x24: dfff800000000000
x23: 0000000000000000 x22: 00000000000000ac x21: ffff0000c8af8000
x20: ffff800011a66460 x19: ffff800022b37eb0 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082d22e0 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000080000
x11: 000000000007ffff x10: ffff80002ca99000 x9 : ffff80000a893be0
x8 : 0000000003aacbc1 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
x2 : ffff800022b37d20 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 local_daif_restore arch/arm64/include/asm/daifflags.h:117 [inline]
 el0_svc_common+0xa8/0x258 arch/arm64/kernel/syscall.c:105
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585