rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P46/1:b..l
	(detected by 0, t=10502 jiffies, g=98905, q=18 ncpus=2)
task:kworker/u4:3    state:R  running task     stack:23152 pid:46    ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:409 [inline]
RIP: 0010:batadv_nc_worker+0x175/0x600 net/batman-adv/network-coding.c:719
Code: 05 94 c1 15 04 01 48 c7 c7 60 d8 ad 8b be 19 03 00 00 48 c7 c2 a0 d8 ad 8b e8 17 5b 6f f7 48 89 e8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 ef e8 f1 c6 dd f7 48 8b 6d 00 48 85 ed 0f 94 c0 48 81
RSP: 0018:ffffc90000b77be0 EFLAGS: 00000246
RAX: 1ffff1100af32340 RBX: 0000000000000001 RCX: ffff888019e73b80
RDX: 0000000000000000 RSI: ffffffff8adf0c00 RDI: ffffffff8adf0bc0
RBP: ffff888057991a00 R08: dffffc0000000000 R09: 1ffffffff215e648
R10: dffffc0000000000 R11: fffffbfff215e649 R12: dffffc0000000000
R13: ffffffff89f595be R14: ffff888057988c80 R15: 0000000000000340
 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1270 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 10522 jiffies! g98905 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:26864 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 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: 0 PID: 14442 Comm: syz.3.2845 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0033:0x7fb6551ba450
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 22 1f 09 00 e8 e5 65 f9 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:00007fb65602da78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fb655415fa0 RCX: 00007fb65519aeb9
RDX: 00007fb65602da80 RSI: 00007fb65602dbb0 RDI: 0000000000000021
RBP: 00007fb655208c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb655416038 R14: 00007fb655415fa0 R15: 00007ffc7ec0d8d8
FS:  00007fb65602e6c0 GS:  0000000000000000