rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P16
rcu: 	(detected by 0, t=10562 jiffies, g=31385, q=14801 ncpus=2)
task:ktimers/0       state:R  running task     stack:22984 pid:16    tgid:16    ppid:2      task_flags:0x4208040 flags:0x00080010
Call Trace:
 <IRQ>
 sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8176
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:300 [inline]
 print_other_cpu_stall+0x1115/0x14c0 kernel/rcu/tree_stall.h:709
 check_cpu_stall kernel/rcu/tree_stall.h:886 [inline]
 rcu_pending kernel/rcu/tree.c:3838 [inline]
 rcu_sched_clock_irq+0xa05/0x1090 kernel/rcu/tree.c:2749
 update_process_times+0x234/0x2d0 kernel/time/timer.c:2475
 tick_sched_handle kernel/time/tick-sched.c:296 [inline]
 tick_nohz_handler+0x38f/0x6b0 kernel/time/tick-sched.c:317
 __run_hrtimer kernel/time/hrtimer.c:2075 [inline]
 __hrtimer_run_queues+0x3a0/0xaf0 kernel/time/hrtimer.c:2132
 hrtimer_interrupt+0x4c2/0xa80 kernel/time/hrtimer.c:2251
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 1d 31 32 f6 f7 c3 00 02 00 00 74 05 e8 10 d7 5e f6 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 64 32 24 f6 65 48 8b 05 dc c4 5c 08 48 85 c0 74 18 5b 41 5e c3
RSP: 0018:ffffc90000157b98 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 8000000000000001
RDX: 0000000000000002 RSI: ffffffff8daee582 RDI: 0000000000000001
RBP: 1ffff110170851aa R08: ffffffff90d49abf R09: 1ffffffff21a9357
R10: dffffc0000000000 R11: fffffbfff21a9358 R12: ffffffff897528c0
R13: ffff8880b8428880 R14: ffff8880b8428880 R15: ffff8880607ed440
 __run_hrtimer kernel/time/hrtimer.c:2071 [inline]
 __hrtimer_run_queues+0x2ee/0xaf0 kernel/time/hrtimer.c:2132
 hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2149
 handle_softirqs+0x1d4/0x6c0 kernel/softirq.c:669
 __do_softirq kernel/softirq.c:703 [inline]
 run_ktimerd+0x6a/0x100 kernel/softirq.c:1208
 smpboot_thread_fn+0x5f8/0xb30 kernel/smpboot.c:162
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10094 jiffies! g31385 f0x0 RCU_GP_WAIT_FQS(5) ->state=I
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=21852
rcu: rcu_preempt kthread starved for 10095 jiffies! g31385 f0x0 RCU_GP_WAIT_FQS(5) ->state=I ->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:I stack:27560 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 1d 31 32 f6 f7 c3 00 02 00 00 74 05 e8 10 d7 5e f6 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 64 32 24 f6 65 48 8b 05 dc c4 5c 08 48 85 c0 74 18 5b 41 5e c3
RSP: 0018:ffffc90000157b98 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 8000000000000001
RDX: 0000000000000002 RSI: ffffffff8daee582 RDI: 0000000000000001
RBP: 1ffff110170851aa R08: ffffffff90d49abf R09: 1ffffffff21a9357
R10: dffffc0000000000 R11: fffffbfff21a9358 R12: ffffffff897528c0
R13: ffff8880b8428880 R14: ffff8880b8428880 R15: ffff8880607ed440
FS:  0000000000000000(0000) GS:ffff88812473f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f54d4697112 CR3: 0000000033792000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 __run_hrtimer kernel/time/hrtimer.c:2071 [inline]
 __hrtimer_run_queues+0x2ee/0xaf0 kernel/time/hrtimer.c:2132
 hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2149
 handle_softirqs+0x1d4/0x6c0 kernel/softirq.c:669
 __do_softirq kernel/softirq.c:703 [inline]
 run_ktimerd+0x6a/0x100 kernel/softirq.c:1208
 smpboot_thread_fn+0x5f8/0xb30 kernel/smpboot.c:162
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>