rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=866/1/0x4000000000000004 softirq=27886/27889 fqs=1
(t=29515 jiffies g=16057 q=23630)
rcu: rcu_preempt kthread starved for 29515 jiffies! g16057 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 28736 10 2 0x80004000
Call Trace:
context_switch kernel/sched/core.c:2817 [inline]
__schedule+0x898/0x1500 kernel/sched/core.c:3444
schedule+0x8f/0x250 kernel/sched/core.c:3508
schedule_timeout+0x38b/0xad0 kernel/time/timer.c:1807
rcu_gp_fqs_loop kernel/rcu/tree.c:1589 [inline]
rcu_gp_kthread+0x999/0x1800 kernel/rcu/tree.c:1746
kthread+0x324/0x3e0 kernel/kthread.c:254
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 13373 Comm: syz-executor.1 Not tainted 5.2.0-rc1+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x113/0x167 lib/dump_stack.c:113
nmi_cpu_backtrace.cold.4+0x3e/0x76 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x121/0x15b lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x16f/0x1bc 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:2625 [inline]
rcu_sched_clock_irq.cold.80+0x4d0/0xc3d kernel/rcu/tree.c:2161
update_process_times+0x2a/0x60 kernel/time/timer.c:1639
tick_sched_handle+0x77/0x140 kernel/time/tick-sched.c:167
tick_sched_timer+0x37/0xf0 kernel/time/tick-sched.c:1298
__run_hrtimer kernel/time/hrtimer.c:1389 [inline]
__hrtimer_run_queues+0x2f6/0xaa0 kernel/time/hrtimer.c:1451
hrtimer_interrupt+0x2df/0x760 kernel/time/hrtimer.c:1509
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1040 [inline]
smp_apic_timer_interrupt+0x114/0x540 arch/x86/kernel/apic/apic.c:1065
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
RIP: 0010:ffs arch/x86/include/asm/bitops.h:413 [inline]
RIP: 0010:__do_softirq+0x224/0x958 kernel/softirq.c:281
Code: c7 c0 40 1b 32 88 48 c1 e8 03 42 80 3c 38 00 0f 85 bb 06 00 00 48 83 3d 29 19 52 01 00 0f 84 f9 05 00 00 fb 66 0f 1f 44 00 00 ff ff ff ff 48 c7 45 c8 00 91 20 88 89 d0 89 55 c0 0f bc 45 d4
RSP: 0018:ffff8880aeb09f18 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1064368 RBX: ffff8880a969c140 RCX: 1ffff110152d393c
RDX: 0000000000000000 RSI: ffff8880a969c9c0 RDI: ffff8880a969c9bc
RBP: ffff8880aeb09f98 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000021
R13: ffff8880a0cae000 R14: 0000000000000021 R15: dffffc0000000000
invoke_softirq kernel/softirq.c:374 [inline]
irq_exit+0x17f/0x1c0 kernel/softirq.c:414
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
do_IRQ+0x10b/0x1c0 arch/x86/kernel/irq.c:258
common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:583
RIP: 0010:vcpu_enter_guest+0x1eb3/0x5240 arch/x86/kvm/x86.c:7941
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 aa 25 00 00 48 83 3d 4a 9d 26 07 00 0f 84 88 15 00 00 fb 66 0f 1f 44 00 00 01 00 00 00 e8 a3 3a 3a 00 65 8b 05 74 7f f6 7e 85 c0 0f 84 b4
RSP: 0018:ffff888095997980 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffde
RAX: dffffc0000000000 RBX: ffff888091280440 RCX: 1ffff110152d393c
RDX: 1ffffffff1064368 RSI: ffff8880a969c9c0 RDI: ffffffff88321b40
RBP: ffff888095997a80 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809128046c
R13: ffff8880912807f0 R14: 0000000000000000 R15: ffff8880a969c140
vcpu_run arch/x86/kvm/x86.c:8096 [inline]
kvm_arch_vcpu_ioctl_run+0x2ec/0x13b0 arch/x86/kvm/x86.c:8304
kvm_vcpu_ioctl+0x452/0xb50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2750
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:696
ksys_ioctl+0x62/0x90 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718
do_syscall_64+0xd0/0x530 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f213c5c3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f213c5c46d4
R13: 00000000004c2bcf R14: 00000000004d6150 R15: 00000000ffffffff