rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11/1:b..l
(detected by 1, t=10503 jiffies, g=11669, q=56 ncpus=2)
task:kworker/u4:1 state:R running task stack:25600 pid:11 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6873
irqentry_exit+0x53/0x80 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+0x26/0x100 kernel/rcu/tree_plugin.h:423
Code: 00 0f 1f 00 55 41 57 41 56 41 55 41 54 53 49 bc 00 00 00 00 00 fc ff df 65 4c 8b 35 54 0a 8e 7e 4d 8d ae 3c 04 00 00 4c 89 eb <48> c1 eb 03 42 0f b6 04 23 84 c0 75 61 41 8b 6d 00 ff cd 42 0f b6
RSP: 0018:ffffc90000107a28 EFLAGS: 00000293
RAX: ffffffff8a7d4b42 RBX: ffff888017eabfbc RCX: ffff888017eabb80
RDX: 0000000000000000 RSI: ffffffff8b5f70c0 RDI: ffffffff8b5f7080
RBP: ffffc90000107b98 R08: ffffffff8a7d4b30 R09: fffffbfff225784d
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888017eabfbc R14: ffff888017eabb80 R15: ffff8880734a1ea0
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:771 [inline]
batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:825 [inline]
batadv_iv_ogm_schedule+0x6e3/0x1090 net/batman-adv/bat_iv_ogm.c:868
batadv_iv_send_outstanding_bat_ogm_packet+0x6ff/0x810 net/batman-adv/bat_iv_ogm.c:1712
process_one_work+0x917/0x1260 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: rcu_preempt kthread starved for 10531 jiffies! g11669 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:26712 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6873
irqentry_exit+0x53/0x80 kernel/entry/common.c:439
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:timer_delete_sync+0x1d3/0x2f0 kernel/time/timer.c:1456
Code: e3 0f 85 df 00 00 00 e8 ab 65 11 00 4c 8b 64 24 18 4d 85 ff 75 07 e8 9c 65 11 00 eb 06 e8 95 65 11 00 fb 65 8b 1d 85 2a 89 7e <89> de 81 e6 00 00 0f 00 31 ff e8 de 68 11 00 81 e3 00 00 0f 00 74
RSP: 0018:ffffc90000157ae0 EFLAGS: 00000293
RAX: ffffffff817944bb RBX: 0000000080000000 RCX: ffff888017fed940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000157bb0 R08: ffffffff81794497 R09: fffffbfff1d41776
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000157be0
R13: dffffc0000000000 R14: 1ffff9200002af60 R15: 0000000000000200
del_timer_sync include/linux/timer.h:198 [inline]
schedule_timeout+0x1c1/0x300 kernel/time/timer.c:1966
rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
kthread+0x28d/0x320 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4586 Comm: syz.3.85 Not tainted 6.1.133-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:-1 [inline]
RIP: 0010:rcu_is_watching+0x40/0xb0 kernel/rcu/tree.c:721
Code: 73 76 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 70 69 df 8c 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 30 74 6e 00 <48> c7 c3 a8 56 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38
RSP: 0018:ffffc90005027de0 EFLAGS: 00000246
RAX: 1ffffffff19bed2e RBX: 0000000000000000 RCX: ffff88802eef5940
RDX: ffff88802eef5940 RSI: ffffffff8b5f70c0 RDI: ffffffff8b5f7080
RBP: ffffc90005027eb8 R08: ffffffff8195291d R09: fffff52000a04f85
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000a04fc4
R13: ffffc900050cd030 R14: ffffffff8cdf6970 R15: dffffc0000000000
FS: 00007fe3d22d16c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe3d15a5fa8 CR3: 000000007f82b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_read_unlock include/linux/rcupdate.h:820 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2285 [inline]
bpf_trace_run2+0x21b/0x410 kernel/trace/bpf_trace.c:2323
__bpf_trace_sys_enter+0x60/0x70 include/trace/events/syscalls.h:18
trace_sys_enter include/trace/events/syscalls.h:18 [inline]
syscall_trace_enter kernel/entry/common.c:81 [inline]
__syscall_enter_from_user_work kernel/entry/common.c:100 [inline]
syscall_enter_from_user_mode+0x206/0x230 kernel/entry/common.c:118
do_syscall_64+0x1e/0xb0 arch/x86/entry/common.c:77
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe3d1329359
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:00007fe3d22d0b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007fe3d15a5fa8 RCX: 00007fe3d1329359
RDX: 00007fe3d22d0b40 RSI: 00007fe3d22d0c70 RDI: 0000000000000011
RBP: 00007fe3d15a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe3d15a5fac
R13: 0000000000000000 R14: 00007ffd09d3c670 R15: 00007ffd09d3c758
sched: RT throttling activated