rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10499 ticks this GP) idle=612/1/0x4000000000000002 softirq=11165/11165 fqs=145
(t=10500 jiffies g=6425 q=78)
rcu: rcu_preempt kthread starved for 10203 jiffies! g6425 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 29032 10 2 0x80004000
Call Trace:
context_switch kernel/sched/core.c:3385 [inline]
__schedule+0x9a0/0xcc0 kernel/sched/core.c:4081
schedule+0x181/0x210 kernel/sched/core.c:4155
schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895
rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821
kthread+0x332/0x350 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events linkwatch_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fb/0x318 lib/dump_stack.c:118
nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254
print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
rcu_pending kernel/rcu/tree.c:2827 [inline]
rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271
update_process_times+0x12d/0x180 kernel/time/timer.c:1726
tick_sched_handle kernel/time/tick-sched.c:167 [inline]
tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310
__run_hrtimer kernel/time/hrtimer.c:1514 [inline]
__hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576
hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:check_kcov_mode kernel/kcov.c:68 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x14/0x50 kernel/kcov.c:102
Code: 00 00 00 48 8b 3d 74 25 cd 07 48 89 de e8 64 02 3b 00 5b 5d c3 cc 48 8b 04 24 65 48 8b 0c 25 c0 1d 02 00 65 8b 15 b8 81 8b 7e c2 00 01 1f 00 75 2c 8b 91 80 13 00 00 83 fa 02 75 21 48 8b 91
RSP: 0018:ffffc90000d8f6c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81487433 RBX: 0000000000000000 RCX: ffff8880a9e42480
RDX: 0000000000000001 RSI: 00000000fffffffc RDI: ffffea0001b042c0
RBP: ffffc90000d8f6f0 R08: 000000000003a768 R09: ffffed101496974f
R10: ffffed101496974f R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff8880a4b4ba68
free_thread_stack+0x168/0x590 kernel/fork.c:280
release_task_stack kernel/fork.c:440 [inline]
put_task_stack+0xa3/0x130 kernel/fork.c:451
finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256
context_switch kernel/sched/core.c:3388 [inline]
__schedule+0x9a8/0xcc0 kernel/sched/core.c:4081
preempt_schedule_common kernel/sched/core.c:4236 [inline]
preempt_schedule+0xdb/0x120 kernel/sched/core.c:4261
___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50
vprintk_emit+0x36d/0x3a0 kernel/printk/printk.c:1997
vprintk_default+0x28/0x30 kernel/printk/printk.c:2023
vprintk_func+0x158/0x170 kernel/printk/printk_safe.c:386
printk+0x62/0x8d kernel/printk/printk.c:2056
addrconf_notify+0x2c8d/0x3c90 net/ipv6/addrconf.c:3573
notifier_call_chain kernel/notifier.c:95 [inline]
__raw_notifier_call_chain kernel/notifier.c:396 [inline]
raw_notifier_call_chain+0xec/0x190 kernel/notifier.c:403
call_netdevice_notifiers_info net/core/dev.c:1893 [inline]
netdev_state_change+0x147/0x1f0 net/core/dev.c:1378
linkwatch_do_dev+0x10e/0x160 net/core/link_watch.c:159
__linkwatch_run_queue+0x446/0x730 net/core/link_watch.c:204
linkwatch_event+0x4c/0x60 net/core/link_watch.c:243
process_one_work+0x7ef/0x10d0 kernel/workqueue.c:2264
worker_thread+0xc01/0x1630 kernel/workqueue.c:2410
kthread+0x332/0x350 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352