rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (1 GPs behind) idle=c0f4/1/0x4000000000000000 softirq=15927/15930 fqs=0
rcu: (t=14835 jiffies g=11417 q=721 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 14834 jiffies! g11417 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=5313
rcu: rcu_preempt kthread starved for 14835 jiffies! g11417 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26632 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
CPU: 0 UID: 0 PID: 1326 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 06 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 b1 5e 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 95 5e
RSP: 0018:ffffc9000426f660 EFLAGS: 00000293
RAX: ffffffff81b44fbb RBX: 1ffff110170e7f61 RCX: ffff888027798000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000426f7e0 R08: ffffffff8fa39237 R09: 1ffffffff1f47246
R10: dffffc0000000000 R11: fffffbfff1f47247 R12: ffff8880b873fb08
R13: dffffc0000000000 R14: ffff8880b863b1c0 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125c14000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556fd99ce8 CR3: 000000000df36000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2653 [inline]
smp_text_poke_batch_finish+0xe98/0x1130 arch/x86/kernel/alternative.c:2946
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked+0xc5/0x1b0 kernel/jump_label.c:240
static_key_disable+0x1a/0x20 kernel/jump_label.c:248
toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:855
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_tt_purge
RIP: 0010:advance_sched+0x94f/0xc90 net/sched/sch_taprio.c:981
Code: 24 80 48 83 c5 10 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 ef e8 26 03 88 f8 4c 8b 74 24 20 <4c> 89 75 00 48 89 df 4c 89 fe 48 8b 54 24 08 e8 3d 03 00 00 48 b8
RSP: 0018:ffffc90000a08c70 EFLAGS: 00000046
RAX: 1ffff1100d2adeaa RBX: ffff888027a882c0 RCX: dffffc0000000000
RDX: 0000000000010000 RSI: 0000000000000cb2 RDI: 0000000000000000
RBP: ffff88806956f550 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200014117c R12: ffff888027a88340
R13: ffff888027a88000 R14: 0000004b50e8b458 R15: ffff88806956f000
FS: 0000000000000000(0000) GS:ffff888125d14000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff3eb11eec CR3: 000000007f32c000 CR4: 00000000003526f0
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0x135/0x1c0 kernel/softirq.c:414
Code: 8b e8 6f aa f5 09 65 66 8b 05 1f d8 1b 11 66 85 c0 75 5a bf 01 00 00 00 e8 78 15 0b 00 e8 f3 6f 42 00 fb 65 8b 05 fb d7 1b 11 <85> c0 75 05 e8 b2 de ae ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc900001178c0 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000000201 RCX: 0d43a34c944b4700
RDX: 0000000000000006 RSI: ffffffff8d9b9d08 RDI: ffffffff8be33880
RBP: ffffc90000117958 R08: ffffffff8fa39237 R09: 1ffffffff1f47246
R10: dffffc0000000000 R11: fffffbfff1f47247 R12: ffffffff8b4ae0f7
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000022f18
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_tt_local_purge+0x2a7/0x340 net/batman-adv/translation-table.c:1315
batadv_tt_purge+0x35/0x9e0 net/batman-adv/translation-table.c:3509
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.437 msecs