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=176017, q=13932 ncpus=2)
task:ktimers/0 state:R running task stack:22024 pid:16 tgid:16 ppid:2 task_flags:0x4208040 flags:0x00080000
Call Trace:
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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_is_held_type+0x10b/0x150 kernel/locking/lockdep.c:6021
Code: ff ff ff 65 0f c1 05 64 6f 61 08 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 48 c7 c7 05 62 ae 8d
RSP: 0018:ffffc90000157ac8 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8dd5936d RDI: ffffffff8becef80
RBP: 00000000ffffffff R08: 0000000000000100 R09: 0000000000000100
R10: dffffc0000000000 R11: fffffbfff21a8918 R12: 0000000000000002
R13: ffff88803be6a000 R14: ffff88803be6a400 R15: 0000000000000004
lock_is_held include/linux/lockdep.h:249 [inline]
advance_sched+0xea/0xc90 net/sched/sch_taprio.c:940
__run_hrtimer kernel/time/hrtimer.c:2075 [inline]
__hrtimer_run_queues+0x3eb/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
rcu: rcu_preempt kthread timer wakeup didn't happen for 10429 jiffies! g176017 f0x0 RCU_GP_WAIT_FQS(5) ->state=I
rcu: Possible timer handling issue on cpu=0 timer-softirq=98088
rcu: rcu_preempt kthread starved for 10430 jiffies! g176017 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:27728 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
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
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 10/07/2026
RIP: 0010:lock_is_held_type+0x10b/0x150 kernel/locking/lockdep.c:6021
Code: ff ff ff 65 0f c1 05 64 6f 61 08 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 48 c7 c7 05 62 ae 8d
RSP: 0018:ffffc90000157ac8 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8dd5936d RDI: ffffffff8becef80
RBP: 00000000ffffffff R08: 0000000000000100 R09: 0000000000000100
R10: dffffc0000000000 R11: fffffbfff21a8918 R12: 0000000000000002
R13: ffff88803be6a000 R14: ffff88803be6a400 R15: 0000000000000004
FS: 0000000000000000(0000) GS:ffff88812474d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff3c88627a7 CR3: 0000000043846000 CR4: 00000000003526f0
Call Trace:
lock_is_held include/linux/lockdep.h:249 [inline]
advance_sched+0xea/0xc90 net/sched/sch_taprio.c:940
__run_hrtimer kernel/time/hrtimer.c:2075 [inline]
__hrtimer_run_queues+0x3eb/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