rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
(detected by 1, t=10502 jiffies, g=9613, q=289 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294958713-4294948213), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g9613 f0x2 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:27760 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
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:__timer_delete_sync+0x1a8/0x2e0 kernel/time/timer.c:1564
Code: 00 4d 85 f6 75 16 e8 77 9a 10 00 eb 15 e8 70 9a 10 00 e8 8b 09 bc 08 4d 85 f6 74 ea e8 61 9a 10 00 fb 65 44 8b 35 f0 82 90 7e <44> 89 f6 81 e6 00 00 0f 00 31 ff e8 a8 9d 10 00 41 81 e6 00 00 0f
RSP: 0018:ffffc90000157ae0 EFLAGS: 00000293
RAX: ffffffff8171ec4f RBX: ffffc90000157be0 RCX: ffff88813fef5940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000157bb0 R08: ffffffff8e1ffbef R09: 1ffffffff1c3ff7d
R10: dffffc0000000000 R11: fffffbfff1c3ff7e R12: ffffffff8171ebba
R13: 1ffff9200002af60 R14: 0000000080000000 R15: 0000000000000000
timer_delete_sync kernel/time/timer.c:1629 [inline]
del_timer_sync include/linux/timer.h:200 [inline]
schedule_timeout+0x18e/0x2d0 kernel/time/timer.c:2169
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: 1 PID: 4497 Comm: syz.0.37 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 00 00 00 66 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 5e c1 2c f7 48 89 df e8 a6 89 2d f7 e8 81 e0 50 f7 fb bf 01 00 00 00 <e8> f6 ed 20 f7 65 8b 05 f7 5f ca 75 85 c0 74 02 5b c3 e8 44 74 c8
RSP: 0000:ffffc90003567bd8 EFLAGS: 00000286
RAX: 5733535010718900 RBX: ffff88802e9b65c0 RCX: 5733535010718900
RDX: dffffc0000000000 RSI: ffffffff8a8c19a0 RDI: 0000000000000001
RBP: ffff88802e9b6a58 R08: ffff88802e9b65c3 R09: 1ffff11005d36cb8
R10: dffffc0000000000 R11: ffffed1005d36cb9 R12: 1ffff11005d36d4b
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
FS: 00007f6ef471f6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 00000000792f0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1163/0x1350 kernel/signal.c:2874
arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:316
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0033:0x7f6ef379ce57
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:00007f6ef471f0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f6ef3a15fa8 RCX: 00007f6ef379ce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6ef3a15fa8
RBP: 00007f6ef3a15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6ef3a16038 R14: 00007ffd9a90fb20 R15: 00007ffd9a90fc08
</TASK>