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=10502 jiffies, g=56177, q=11142 ncpus=1)
task:ktimers/0       state:R  running task     stack:21512 pid:16    tgid:16    ppid:2      task_flags:0x4208040 flags:0x00080000
Call Trace:
 <IRQ>
 sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8250
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
 print_other_cpu_stall+0xfbf/0x1350 kernel/rcu/tree_stall.h:683
 check_cpu_stall kernel/rcu/tree_stall.h:860 [inline]
 rcu_pending kernel/rcu/tree.c:3744 [inline]
 rcu_sched_clock_irq+0x9fe/0x10e0 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:2074 [inline]
 __hrtimer_run_queues+0x3a0/0xaf0 kernel/time/hrtimer.c:2131
 hrtimer_interrupt+0x4c2/0xa80 kernel/time/hrtimer.c:2250
 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:advance_sched+0x979/0xc90 net/sched/sch_taprio.c:988
Code: 3c 30 00 74 05 e8 67 d8 ce f8 48 8b 44 24 08 49 89 84 24 50 01 00 00 48 89 df 4c 89 e3 48 8b 74 24 20 4c 89 e2 e8 27 03 00 00 <48> 8b 84 24 80 00 00 00 42 80 3c 30 00 74 0a 48 8b 7c 24 78 e8 2e
RSP: 0018:ffffc90000157af0 EFLAGS: 00000286
RAX: ffffffff8964004d RBX: ffff88803bd87800 RCX: ffff88801cab8000
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000100
RBP: ffff88803bd87808 R08: ffff88803bd87887 R09: 1ffff110077b0f10
R10: dffffc0000000000 R11: ffffed10077b0f11 R12: ffff88803bd87800
R13: ffff8880618d6000 R14: dffffc0000000000 R15: ffff8880618d6440
 __run_hrtimer kernel/time/hrtimer.c:2074 [inline]
 __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2131
 hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2148
 handle_softirqs+0x1da/0x6d0 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 run_ktimerd+0x6a/0x100 kernel/softirq.c:1174
 smpboot_thread_fn+0x565/0xa70 kernel/smpboot.c:160
 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 10501 jiffies! g56177 f0x0 RCU_GP_WAIT_FQS(5) ->state=I
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=35261
rcu: rcu_preempt kthread starved for 10502 jiffies! g56177 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:27688 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7376
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 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 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:advance_sched+0x979/0xc90 net/sched/sch_taprio.c:988
Code: 3c 30 00 74 05 e8 67 d8 ce f8 48 8b 44 24 08 49 89 84 24 50 01 00 00 48 89 df 4c 89 e3 48 8b 74 24 20 4c 89 e2 e8 27 03 00 00 <48> 8b 84 24 80 00 00 00 42 80 3c 30 00 74 0a 48 8b 7c 24 78 e8 2e
RSP: 0018:ffffc90000157af0 EFLAGS: 00000286
RAX: ffffffff8964004d RBX: ffff88803bd87800 RCX: ffff88801cab8000
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000100
RBP: ffff88803bd87808 R08: ffff88803bd87887 R09: 1ffff110077b0f10
R10: dffffc0000000000 R11: ffffed10077b0f11 R12: ffff88803bd87800
R13: ffff8880618d6000 R14: dffffc0000000000 R15: ffff8880618d6440
FS:  0000000000000000(0000) GS:ffff888125bc2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff2b3b4d30 CR3: 0000000087e10000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __run_hrtimer kernel/time/hrtimer.c:2074 [inline]
 __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2131
 hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2148
 handle_softirqs+0x1da/0x6d0 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 run_ktimerd+0x6a/0x100 kernel/softirq.c:1174
 smpboot_thread_fn+0x565/0xa70 kernel/smpboot.c:160
 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>