rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8292 at kernel/sched/core.c:3013 rq_unlock kernel/sched/sched.h:1326 [inline] WARNING: CPU: 0 PID: 8292 at kernel/sched/core.c:3013 try_invoke_on_locked_down_task+0x214/0x2c0 kernel/sched/core.c:3019 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8292 Comm: syz-executor.5 Not tainted 5.9.0-rc5-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+0x198/0x1fd lib/dump_stack.c:118 panic+0x347/0x7c0 kernel/panic.c:231 __warn.cold+0x20/0x46 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:try_invoke_on_locked_down_task+0x214/0x2c0 kernel/sched/core.c:3013 Code: 45 31 f6 49 39 c0 74 3a 8b 74 24 38 49 8d 78 18 4c 89 04 24 e8 ad 9a 08 00 4c 8b 04 24 4c 89 c7 e8 51 1f a2 06 e9 29 ff ff ff <0f> 0b e9 86 fe ff ff 4c 89 ee 48 89 ef 41 ff d4 41 89 c6 e9 11 ff RSP: 0018:ffffc90000007bd8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 1ffff92000000f7d RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff81612f30 RDI: ffff8880a0a70400 RBP: ffff8880a0a70400 R08: 0000000000000033 R09: ffffffff89bcb4a3 R10: 000000000000077a R11: 0000000000000001 R12: ffffffff81612f30 R13: ffffc90000007d00 R14: ffff8880a0a70780 R15: ffff8880ae636c00 rcu_print_task_stall kernel/rcu/tree_stall.h:267 [inline] print_other_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:634 [inline] rcu_pending kernel/rcu/tree.c:3637 [inline] rcu_sched_clock_irq.cold+0x92e/0xccd kernel/rcu/tree.c:2519 update_process_times+0x25/0xa0 kernel/time/timer.c:1710 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1524 [inline] __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1588 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:197 Code: 5d be 03 00 00 00 e9 56 4e 24 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 c0 fe 01 00 <65> 8b 05 b0 b1 8d 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 RSP: 0018:ffffc9000a007690 EFLAGS: 00000287 RAX: 0000000000000000 RBX: 0000000000000008 RCX: ffffffff810bb5cd RDX: ffff8880a1b5a500 RSI: ffff8880a1b5a500 RDI: 0000000000000005 RBP: ffff88808fd5c100 R08: 0000000000000000 R09: ffff88808fd5c447 R10: 0000000000001000 R11: 0000000000000000 R12: 0000000000000008 R13: 000000000000000f R14: ffff88809d8dcde0 R15: 0000000000000017 kvm_fetch_guest_virt+0x10b/0x190 arch/x86/kvm/x86.c:5599 __do_insn_fetch_bytes+0x2f0/0x6b0 arch/x86/kvm/emulate.c:918 x86_decode_insn+0x17f4/0x5520 arch/x86/kvm/emulate.c:5187 x86_emulate_instruction+0xa6e/0x1e00 arch/x86/kvm/x86.c:6946 kvm_mmu_page_fault+0x2ff/0x15c0 arch/x86/kvm/mmu/mmu.c:5500 handle_ept_violation+0x2b7/0x720 arch/x86/kvm/vmx/vmx.c:5337 vmx_handle_exit+0x293/0x14c0 arch/x86/kvm/vmx/vmx.c:6119 vcpu_enter_guest+0x18f4/0x3c20 arch/x86/kvm/x86.c:8641 vcpu_run arch/x86/kvm/x86.c:8706 [inline] kvm_arch_vcpu_ioctl_run+0x440/0x1780 arch/x86/kvm/x86.c:8923 kvm_vcpu_ioctl+0x467/0xdf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3230 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c8c9 Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0c9106ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0c9106f6d4 RCX: 000000000045c8c9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003be R14: 00000000004c64fe R15: 000000000076bf0c Kernel Offset: disabled Rebooting in 86400 seconds..