rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4719/1:b..l
	(detected by 1, t=10502 jiffies, g=11193, q=313 ncpus=2)
task:kworker/u4:9    state:R  running task     stack:0     pid:4719  ppid:2      flags:0x00000008
Workqueue: bat_events batadv_nc_worker
Call trace:
 __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562
 preempt_schedule_irq+0x8c/0x1ac kernel/sched/core.c:6874
 arm64_preempt_schedule_irq+0x44/0x54 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
 debug_lockdep_rcu_enabled+0x30/0x40 kernel/rcu/update.c:281
 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292
 worker_thread+0x8c4/0xfec 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 10502 jiffies! g11193 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+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562
 schedule+0xc4/0x170 kernel/sched/core.c:6638
 schedule_timeout+0x194/0x2f4 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x2b4/0x1378 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xb4/0x2fc 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: 6333 Comm: syz.3.348 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : lock_acquire+0x24c/0x63c arch/arm64/include/asm/irqflags.h:-1
lr : lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
lr : lock_acquire+0x218/0x63c kernel/locking/lockdep.c:5664
sp : ffff8000212175e0
x29: ffff800021217640 x28: ffff800015165d00 x27: dfff800000000000
x26: ffff00019f564d00 x25: 0000000000000000 x24: 0000000000000000
x23: ffff8000087e15d8 x22: 0000000000000000 x21: 0000000000000000
x20: 0000000000000000 x19: ffff00019f564d00 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082d7e60 x15: 0000ffff8d7dd8f8
x14: 0000000000000001 x13: 1ffff00002a42071 x12: 0000000000080000
x11: 000000000007ffff x10: ffff80002a9b2000 x9 : 0000000000000080
x8 : 00000000000000c0 x7 : ffff8000087e15d8 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : ffff800011b8ebc0 x0 : 0000000000000001
Call trace:
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline]
 lock_acquire+0x24c/0x63c kernel/locking/lockdep.c:5665
 __might_fault+0xc4/0x124 mm/memory.c:5850
 restore_sigframe arch/arm64/kernel/signal.c:663 [inline]
 __arm64_sys_rt_sigreturn+0x2c4/0x1f64 arch/arm64/kernel/signal.c:714
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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