rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=15709, q=864 ncpus=2)
task:kworker/u4:0    state:R  running task     stack:24688 pid:11    ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:409 [inline]
RIP: 0010:batadv_nc_worker+0x183/0x610 net/batman-adv/network-coding.c:719
Code: 99 c5 8b be 14 03 00 00 48 c7 c2 a0 99 c5 8b e8 23 f3 30 f7 48 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 ef e8 9d 2e a6 f7 <48> 8b 6d 00 48 85 ed 0f 94 c0 48 81 c5 38 fe ff ff 0f 94 c1 08 c1
RSP: 0018:ffffc90000107b60 EFLAGS: 00000246
RAX: 1ffff110037618e8 RBX: 0000000000000001 RCX: ffff888019e7bc00
RDX: 0000000000000000 RSI: ffffffff8afc63a0 RDI: ffffffff8afc6360
RBP: ffff88801bb0c740 R08: dffffc0000000000 R09: 1ffffffff21b4ea0
R10: dffffc0000000000 R11: fffffbfff21b4ea1 R12: dffffc0000000000
R13: ffffffff8a36b332 R14: ffff88805f17cc80 R15: 00000000000000e8
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: rcu_preempt kthread starved for 10525 jiffies! g15709 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:26920 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 6168 Comm: syz.5.22 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__get_user_nocheck_8+0x7/0x20 arch/x86/lib/getuser.S:134
Code: 90 90 90 f3 0f 1e fa 0f 01 cb 0f ae e8 8b 10 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 01 cb <0f> ae e8 48 8b 10 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003a67cf8 EFLAGS: 00040246
RAX: 00007ffd7554ca40 RBX: 0000000000000000 RCX: ffff888018f49e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003a67f10 R08: ffffffff8e4a836f R09: 1ffffffff1c9506d
R10: dffffc0000000000 R11: fffffbfff1c9506e R12: 00007ffd7554ca38
R13: 1ffff9200074cffe R14: 00000000ffffffff R15: 1ffff9200074cfa8
FS:  0000555588407500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 000000001b76b000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 __ia32_sys_rt_sigreturn+0x150/0x7b0 arch/x86/kernel/signal_64.c:258
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f47b472af79
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007ffd7554ca40 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f47b49e5fa0 RCX: 00007f47b472af79
RDX: 00007ffd7554ca40 RSI: 00007ffd7554cb70 RDI: 0000000000000021
RBP: 00007f47b4811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f47b49e5fa0 R14: 00007f47b49e5fa0 R15: 0000000000000004
 </TASK>