rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=92d/1/0x4000000000000000 softirq=7835/7844 fqs=10 
	(t=10500 jiffies g=8981 q=611)
rcu: rcu_preempt kthread starved for 10478 jiffies! g8981 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:26960 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
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: 4420 Comm: syz.3.28 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__lock_acquire+0x69c7/0x7d10 kernel/locking/lockdep.c:4982
Code: 00 00 00 00 fc ff df e9 79 9c ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c ce a2 ff ff 4c 89 e7 e8 0e be 60 00 e9 c1 a2 ff ff <48> c7 c1 80 9f 2d 96 80 e1 07 80 c1 03 38 c1 0f 8c b7 a3 ff ff 48
RSP: 0018:ffffc90003d2f660 EFLAGS: 00000002
RAX: 0000000000000004 RBX: 0000000000000001 RCX: ffffffff815dba74
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d30c8
RBP: ffffc90003d2f8b0 R08: dffffc0000000000 R09: 1ffffffff203a619
R10: dffffc0000000000 R11: fffffbfff203a61a R12: ffff88802d07e478
R13: ffff88802d07d940 R14: ffffffff8fbcb838 R15: ffff88802d07e458
FS:  00005555601a2500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000023828000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
 lock_hrtimer_base kernel/time/hrtimer.c:168 [inline]
 hrtimer_start_range_ns+0xff/0xc20 kernel/time/hrtimer.c:1284
 posixtimer_rearm+0x131/0x340 kernel/time/posix-timers.c:329
 dequeue_signal+0x174/0x440 kernel/signal.c:696
 get_signal+0x6fe/0x12c0 kernel/signal.c:2781
 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8e7ec13232
Code: 24 70 0f 29 9c 24 80 00 00 00 0f 29 a4 24 90 00 00 00 0f 29 ac 24 a0 00 00 00 0f 29 b4 24 b0 00 00 00 0f 29 bc 24 c0 00 00 00 <80> 3d ae 44 ef 00 00 74 56 e8 80 a7 0d 00 48 8b 3d e1 aa 39 00 48
RSP: 002b:00007ffe4a475df0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f8e7edf55a5 RCX: 00007f8e7ee0dc36
RDX: 0000000000022d79 RSI: 0000000000000000 RDI: 00007f8e7edf55a5
RBP: 00007f8e7ee0dc36 R08: 0000000000000000 R09: 000979905d1c4d2c
R10: 00000090b33ff91a R11: 000000000000bfa8 R12: 0000000000000000
R13: 00007f8e7efd7fac R14: 00007f8e7efd7fa0 R15: 00007f8e7efd7fa0
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 4417 Comm: syz.2.19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31d/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6ea/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:2021
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4ad/0xb70 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
sched: RT throttling activated
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [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 ee ea 97 f7 48 89 df e8 26 c3 98 f7 e8 91 b5 b9 f7 fb bf 01 00 00 00 <e8> a6 c9 8c f7 65 8b 05 47 d7 3c 76 85 c0 74 02 5b c3 e8 94 e4 3a
RSP: 0018:ffffc90003d1fbc0 EFLAGS: 00000282
RAX: 9ba0810f9092b400 RBX: ffff888057c840c0 RCX: 9ba0810f9092b400
RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffff888057c840c3 R09: 1ffff1100af90818
R10: dffffc0000000000 R11: ffffed100af90819 R12: ffff888057c840c0
R13: 0000000000000021 R14: dffffc0000000000 R15: 000000001c000004
 spin_unlock_irq include/linux/spinlock.h:414 [inline]
 get_signal+0x11d6/0x12c0 kernel/signal.c:2903
 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f45cdcd1537
Code: 24 08 64 48 2b 14 25 28 00 00 00 75 05 48 83 c4 18 c3 e8 7c 97 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8b 05 29 f1 24 00 <48> 85 c0 74 14 48 83 ec 08 ff d0 85 c0 75 1a 31 c0 48 83 c4 08 c3
RSP: 002b:00007ffe53f152b8 EFLAGS: 00000206
RAX: 00007ffe53f1e910 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 00007f45cddf59a0 RSI: 00007ffe53f15320 RDI: 0000000000000001
RBP: 00007f45cdd87c36 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f45cdf51fac R14: 00007f45cdf51fa0 R15: 00007f45cdf51fa0
 </TASK>