rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4370/1:b..l
(detected by 1, t=10502 jiffies, g=10753, q=390 ncpus=2)
task:kworker/u4:5 state:R running task stack:26192 pid:4370 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x107f/0x4030 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:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:384 [inline]
RIP: 0010:__rcu_read_unlock+0x1b/0xd0 kernel/rcu/tree_plugin.h:423
Code: 03 38 c1 7c e3 48 89 df e8 a2 5d 66 00 eb d9 41 57 41 56 41 55 41 54 53 49 bf 00 00 00 00 00 fc ff df 65 48 8b 3d 05 84 95 7e <48> 8d 9f 3c 04 00 00 49 89 dc 49 c1 ec 03 43 0f b6 04 3c 84 c0 75
RSP: 0018:ffffc90003f87bb0 EFLAGS: 00000293
RAX: ffffffff89f44547 RBX: ffff88802e3d3600 RCX: ffff8880264c5a00
RDX: 0000000000000000 RSI: ffffffff8adee180 RDI: ffff8880264c5a00
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff215e448
R10: dffffc0000000000 R11: fffffbfff215e449 R12: dffffc0000000000
R13: ffffffff89f4440e R14: ffff888025470c80 R15: dffffc0000000000
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
batadv_nc_worker+0x278/0x600 net/batman-adv/network-coding.c:719
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: rcu_preempt kthread starved for 10522 jiffies! g10753 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:27840 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x107f/0x4030 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+0x303/0x1350 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
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 4526 Comm: syz.2.19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__unsafe_setup_sigcontext arch/x86/kernel/signal.c:168 [inline]
RIP: 0010:__setup_rt_frame arch/x86/kernel/signal.c:486 [inline]
RIP: 0010:setup_rt_frame arch/x86/kernel/signal.c:784 [inline]
RIP: 0010:handle_signal arch/x86/kernel/signal.c:828 [inline]
RIP: 0010:arch_do_signal_or_restart+0xa74/0x1310 arch/x86/kernel/signal.c:873
Code: ff e8 e0 4d a6 00 49 8b 07 49 89 06 4c 8b 74 24 10 4d 8d 7e 40 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ff e8 b2 4d a6 00 49 8b 07 49 89 44 24 38 4d 8d 7e 38
RSP: 0018:ffffc90003667ca0 EFLAGS: 00040246
RAX: 1ffff920006ccff3 RBX: 1ffff920006ccfac RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003667ec0 R08: 0000000000000000 R09: 1ffff920006ccf71
R10: dffffc0000000000 R11: fffff520006ccf72 R12: 00007f632a48bb38
R13: 0000000000000000 R14: ffffc90003667f58 R15: ffffc90003667f98
FS: 00007f632a48c6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 00000000575ba000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f632959ce57
Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89
RSP: 002b:00007f632a48c0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f6329815fa8 RCX: 00007f632959ce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6329815fa8
RBP: 00007f6329815fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6329816038 R14: 00007ffc5ab4d3a0 R15: 00007ffc5ab4d488
sched: RT throttling activated