syzbot

rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=105002 jiffies, g=89793, q=195)
rcu: All QSes seen, last rcu_sched kthread activity 105002 (4295067669-4294962667), jiffies_till_next_fqs=3, root ->qsmask 0x0
syz-executor5   R  running task    24488  9936   4748 0x00000008
Call Trace:
 <IRQ>
 sched_show_task.cold.85+0x273/0x2d5 kernel/sched/core.c:5296
 print_other_cpu_stall.cold.79+0x8e0/0x91d kernel/rcu/tree.c:1430
 check_cpu_stall kernel/rcu/tree.c:1557 [inline]
 __rcu_pending kernel/rcu/tree.c:3276 [inline]
 rcu_pending kernel/rcu/tree.c:3319 [inline]
 rcu_check_callbacks+0x986/0x15a0 kernel/rcu/tree.c:2665
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x3eb/0xff0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline]
 smp_apic_timer_interrupt+0x16d/0x6a0 arch/x86/kernel/apic/apic.c:1054
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
 </IRQ>
RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline]
RIP: 0010:smp_call_function_single+0x3f5/0x5c0 kernel/smp.c:302
Code: 48 89 44 24 28 e8 9b 3b 0c 00 45 85 e4 74 67 48 8b 44 24 28 48 83 c3 18 49 89 c4 e8 75 3a 0c 00 f3 90 48 89 d8 41 c6 04 24 04 <48> c1 e8 03 42 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 35 01 00 00 41
RSP: 0018:ffff8801cfb8f3a0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8801cfb8f418 RBX: ffff8801cfb8f418 RCX: ffffffff8170865c
RDX: 0000000000000000 RSI: ffffffff8170860b RDI: 0000000000000005
RBP: ffff8801cfb8f4f0 R08: ffff8801bcb92140 R09: ffffed003b625b98
R10: ffffed003b625b98 R11: ffff8801db12dcc7 R12: ffffed0039f71e90
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000001
 loaded_vmcs_clear arch/x86/kvm/vmx.c:2218 [inline]
 vmx_vcpu_load+0x873/0xfe0 arch/x86/kvm/vmx.c:3062
 kvm_arch_vcpu_load+0x22b/0x940 arch/x86/kvm/x86.c:3106
 vcpu_load+0x32/0x40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:164
 kvm_unload_vcpu_mmu arch/x86/kvm/x86.c:8852 [inline]
 kvm_free_vcpus arch/x86/kvm/x86.c:8867 [inline]
 kvm_arch_destroy_vm+0x1f9/0x7c0 arch/x86/kvm/x86.c:8967
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:752 [inline]
 kvm_put_kvm+0x73f/0x1060 arch/x86/kvm/../../../virt/kvm/kvm_main.c:773
 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2407
 __fput+0x38a/0xa40 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x410c41
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffc6fee9a70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 000000000000000b RCX: 0000000000410c41
RDX: 0000000000000000 RSI: 00000000007305f0 RDI: 000000000000000a
RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffc6fee99a0 R11: 0000000000000293 R12: 0000000000000009
R13: 00000000000485c6 R14: 0000000000000052 R15: badc0ffeebadface
rcu: rcu_sched kthread starved for 105002 jiffies! g89793 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_sched       R  running task    23480    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x87c/0x1df0 kernel/sched/core.c:3473
 schedule+0xfb/0x450 kernel/sched/core.c:3517
 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804
 rcu_gp_kthread+0x743/0x1d20 kernel/rcu/tree.c:2194
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413