rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4599/1:b..l
	(detected by 0, t=10502 jiffies, g=8333, q=58 ncpus=2)
task:kworker/u4:6    state:R  running task     stack:0     pid:4599  ppid:2      flags:0x00000008
Workqueue: bat_events batadv_nc_worker
Call trace:
 __switch_to+0x320/0x754 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0xef4/0x1d44 kernel/sched/core.c:6558
 preempt_schedule_irq+0x8c/0x1b8 kernel/sched/core.c:6870
 arm64_preempt_schedule_irq arch/arm64/kernel/entry-common.c:265 [inline]
 __el1_irq arch/arm64/kernel/entry-common.c:474 [inline]
 el1_interrupt+0x4c/0x68 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+0x2ac/0x7cc 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_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0xd0/0x580 net/batman-adv/network-coding.c:719
 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292
 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
rcu: rcu_preempt kthread starved for 10481 jiffies! g8333 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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+0x320/0x754 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0xef4/0x1d44 kernel/sched/core.c:6558
 schedule+0xc4/0x170 kernel/sched/core.c:6634
 schedule_timeout+0x1d8/0x344 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2cc/0x1538 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xc0/0x308 kernel/rcu/tree.c:1905
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 5326 Comm: syz.1.347 Not tainted 6.1.103-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : arch_local_irq_restore+0x8/0x10 arch/arm64/include/asm/irqflags.h:131
lr : lock_is_held_type+0x150/0x1a8 kernel/locking/lockdep.c:5707
sp : ffff80001f6079f0
x29: ffff80001f6079f0 x28: 00ffffe9f519b800 x27: 0000000000000001
x26: ffff0000d2ce0000 x25: ffff800015913cc0 x24: 0000000000000080
x23: ffff0000d2ce0000 x22: ffff0000d2ce0000 x21: ffff800015b94ec0
x20: 0000000000000000 x19: 0000000000000000 x18: 1fffe0001b6e1884
x17: 0000000000000000 x16: ffff800008303e0c x15: 0000000000000000
x14: 1ffff00002b380b0 x13: dfff800000000000 x12: 0000000055547681
x11: 0000000000ff0100 x10: 0000000000000000 x9 : 0000000000000000
x8 : 00000000000000c0 x7 : ffff8000088658d4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000000 x1 : ffff8000123dd7c0 x0 : 0000000000000000
Call trace:
 arch_local_irq_restore+0x8/0x10 arch/arm64/include/asm/irqflags.h:122
 lock_is_held include/linux/lockdep.h:283 [inline]
 __might_resched+0x48/0x4d8 kernel/sched/core.c:9904
 __might_sleep+0x90/0xe4 kernel/sched/core.c:9871
 __might_fault+0x7c/0x124 mm/memory.c:5832
 setup_sigframe arch/arm64/kernel/signal.c:788 [inline]
 setup_rt_frame arch/arm64/kernel/signal.c:975 [inline]
 handle_signal arch/arm64/kernel/signal.c:1016 [inline]
 do_signal arch/arm64/kernel/signal.c:1091 [inline]
 do_notify_resume+0xcf4/0x3474 arch/arm64/kernel/signal.c:1129
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585