rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 ticks this GP) idle=73e/1/0x4000000000000002 softirq=62428/62428 fqs=0 (t=14915 jiffies g=55929 q=196697) rcu: rcu_preempt kthread starved for 14915 jiffies! g55929 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29480 10 2 0x80004000 Call Trace: schedule+0xc4/0x2b0 kernel/sched/core.c:4156 schedule_timeout+0x363/0x970 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1658 [inline] rcu_gp_kthread+0x992/0x1710 kernel/rcu/tree.c:1818 kthread+0x31d/0x3e0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 7710 Comm: syz-executor.5 Not tainted 5.5.0-syzkaller #0 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+0x128/0x182 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.7+0x4b/0x83 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x183/0x1ac lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x16d/0x1b9 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3030 [inline] rcu_sched_clock_irq.cold.88+0x51e/0xc7d kernel/rcu/tree.c:2276 update_process_times+0x1f/0x50 kernel/time/timer.c:1726 tick_sched_handle+0x6f/0x130 kernel/time/tick-sched.c:171 tick_sched_timer+0x3e/0xf0 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x2e1/0xac0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x2e5/0x770 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x15e/0x5f0 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:preempt_schedule_irq+0x7b/0x120 kernel/sched/core.c:4339 Code: 94 3b fa e8 e7 d1 60 fa 4c 89 e8 48 c1 e8 03 80 3c 28 00 0f 85 89 00 00 00 48 83 3d 36 af a8 01 00 74 6f fb 66 0f 1f 44 00 00 01 00 00 00 e8 8b d9 ff ff 41 80 3c 24 00 75 78 48 83 3d 0c af RSP: 0018:ffffc90005f378a8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1166aa9 RBX: 0000000000000000 RCX: 0000000000000006 RDX: 0000000000000000 RSI: ffff8880a4862a80 RDI: ffff8880a4862a54 RBP: dffffc0000000000 R08: fffffbfff1657db4 R09: fffffbfff1657db4 R10: fffffbfff1657db3 R11: ffffffff8b2bed9f R12: fffffbfff1166aa8 R13: ffffffff88b35548 R14: ffffffff88b35540 R15: 0000000000000000 retint_kernel+0x1b/0x2b RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_acquire+0x210/0x420 kernel/locking/lockdep.c:4487 Code: 00 00 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d6 01 00 00 48 83 3d a4 02 63 07 00 0f 84 59 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffffc90005f37988 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: ffff8880a48621c0 RCX: 1ffff92000be6f1a RDX: 1ffffffff1166aa7 RSI: 0000000000000008 RDI: 0000000000000286 RBP: 0000000000000000 R08: fffffbfff1657db4 R09: fffffbfff1657db4 R10: fffffbfff1657db3 R11: ffff8880a48621c0 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:208 [inline] srcu_read_lock include/linux/srcu.h:155 [inline] vcpu_run arch/x86/kvm/x86.c:8385 [inline] kvm_arch_vcpu_ioctl_run+0xf5d/0x5e40 arch/x86/kvm/x86.c:8561 kvm_vcpu_ioctl+0x499/0xa60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2847 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x18b/0x1080 fs/ioctl.c:732 ksys_ioctl+0x5b/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6a/0xb0 fs/ioctl.c:754 do_syscall_64+0xc6/0x5e0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d239 Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fed144fbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000010ac0 RCX: 000000000045d239 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 000000000118d0c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d08c R13: 00007ffce6c57bcf R14: 00007fed144fc9c0 R15: 000000000118d08c