[ 81.566188][ T27] audit: type=1800 audit(1584685540.788:25): pid=9669 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 82.486800][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 82.486811][ T27] audit: type=1800 audit(1584685541.708:29): pid=9669 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 82.531665][ T27] audit: type=1800 audit(1584685541.708:30): pid=9669 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 164.635598][ C1] hrtimer: interrupt took 60270 ns [ 164.659845][ T9821] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. [ 320.685552][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 320.692270][ C1] rcu: 1-....: (15560 ticks this GP) idle=16a/1/0x4000000000000002 softirq=11581/11583 fqs=5243 [ 320.702978][ C1] (t=10500 jiffies g=8917 q=171) [ 320.707990][ C1] NMI backtrace for cpu 1 [ 320.712301][ C1] CPU: 1 PID: 9821 Comm: syz-executor148 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 320.722304][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 320.732348][ C1] Call Trace: [ 320.735714][ C1] [ 320.738662][ C1] dump_stack+0x188/0x20d [ 320.743020][ C1] nmi_cpu_backtrace.cold+0x70/0xb1 [ 320.748259][ C1] ? lapic_can_unplug_cpu.cold+0x3b/0x3b [ 320.753887][ C1] nmi_trigger_cpumask_backtrace+0x231/0x27e [ 320.759926][ C1] rcu_dump_cpu_stacks+0x19e/0x1e8 [ 320.765050][ C1] rcu_sched_clock_irq.cold+0x560/0xcfa [ 320.770649][ C1] ? trace_hardirqs_off+0x50/0x220 [ 320.775832][ C1] update_process_times+0x25/0x60 [ 320.780900][ C1] tick_sched_handle+0x9b/0x180 [ 320.785767][ C1] tick_sched_timer+0x4e/0x140 [ 320.790523][ C1] __hrtimer_run_queues+0x32c/0xdd0 [ 320.795715][ C1] ? tick_sched_do_timer+0x1a0/0x1a0 [ 320.800995][ C1] ? hrtimer_init+0x320/0x320 [ 320.805749][ C1] ? ktime_get_update_offsets_now+0x2d6/0x450 [ 320.811813][ C1] hrtimer_interrupt+0x312/0x770 [ 320.816924][ C1] smp_apic_timer_interrupt+0x15b/0x600 [ 320.822512][ C1] apic_timer_interrupt+0xf/0x20 [ 320.827637][ C1] [ 320.830670][ C1] RIP: 0010:lock_acquire+0x1b/0x420 [ 320.835929][ C1] Code: ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 57 4d 89 cf 41 56 41 89 ce 41 55 41 89 d5 41 54 <41> 89 f4 55 48 89 fd 65 48 8b 14 25 c0 1e 02 00 48 8d ba 9c 08 00 [ 320.855642][ C1] RSP: 0018:ffffc90001e575f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 320.864067][ C1] RAX: dffffc0000000000 RBX: ffff88808ac24140 RCX: 0000000000000001 [ 320.872029][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88808e54b318 [ 320.880014][ C1] RBP: ffffffff8821ec40 R08: 0000000000000001 R09: 0000000000000000 [ 320.887969][ C1] R10: ffffed1011329681 R11: ffff88808994b40b R12: 0000000000000045 [ 320.895973][ C1] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 [ 320.904045][ C1] ? ___might_sleep+0x15a/0x2b0 [ 320.908917][ C1] __might_fault+0x152/0x1d0 [ 320.913503][ C1] ? __might_fault+0xef/0x1d0 [ 320.918211][ C1] __kvm_read_guest_page+0x65/0xc0 [ 320.923399][ C1] kvm_fetch_guest_virt+0x13d/0x1b0 [ 320.928620][ C1] __do_insn_fetch_bytes+0x2f9/0x6c0 [ 320.933895][ C1] ? em_aam+0x200/0x200 [ 320.938079][ C1] ? ept_gva_to_gpa+0x1e0/0x1e0 [ 320.942921][ C1] ? mark_lock+0xa0/0x1220 [ 320.947330][ C1] x86_decode_insn+0x176c/0x5730 [ 320.952298][ C1] ? vmx_segment_cache_test_set+0xc2/0x170 [ 320.958110][ C1] ? init_decode_cache+0x1c/0xb0 [ 320.963046][ C1] ? init_emulate_ctxt+0x3b3/0x500 [ 320.968142][ C1] ? emulator_task_switch+0xf90/0xf90 [ 320.973509][ C1] ? kvm_mmu_get_page+0x1e10/0x1e10 [ 320.978792][ C1] ? kvm_vcpu_mtrr_init+0x70/0x70 [ 320.983911][ C1] x86_emulate_instruction+0x8bc/0x1c20 [ 320.989489][ C1] ? mmio_info_in_cache+0x135/0x520 [ 320.994677][ C1] kvm_mmu_page_fault+0x37b/0x1660 [ 320.999779][ C1] ? __lock_acquire+0x827/0x5270 [ 321.004740][ C1] ? kvm_nx_lpage_recovery_worker+0x790/0x790 [ 321.010800][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 321.016334][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 321.022300][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 321.027841][ C1] ? handle_ept_violation+0x20d/0x550 [ 321.033258][ C1] ? vmx_inject_irq+0x5b0/0x5b0 [ 321.038120][ C1] vmx_handle_exit+0x2b8/0x1710 [ 321.042975][ C1] vcpu_enter_guest+0x33df/0x6120 [ 321.047997][ C1] ? mark_held_locks+0x9f/0xe0 [ 321.052807][ C1] ? kvm_vcpu_reload_apic_access_page+0x370/0x370 [ 321.059275][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 321.065058][ C1] ? __this_cpu_preempt_check+0x84/0x190 [ 321.070718][ C1] ? smp_apic_timer_interrupt+0x1b6/0x600 [ 321.076482][ C1] ? retint_kernel+0x2b/0x2b [ 321.081074][ C1] ? kvm_check_async_pf_completion+0x2a4/0x400 [ 321.087225][ C1] ? kvm_arch_vcpu_ioctl_run+0x406/0x1790 [ 321.092941][ C1] ? kvm_arch_vcpu_ioctl_run+0x41c/0x1790 [ 321.098651][ C1] kvm_arch_vcpu_ioctl_run+0x41c/0x1790 [ 321.104584][ C1] kvm_vcpu_ioctl+0x493/0xe60 [ 321.109279][ C1] ? kvm_set_memory_region+0x40/0x40 [ 321.114598][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 321.120076][ C1] ? lockdep_hardirqs_on+0x417/0x5d0 [ 321.125378][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 321.130937][ C1] ? __this_cpu_preempt_check+0x84/0x190 [ 321.136573][ C1] ? smp_apic_timer_interrupt+0x1b6/0x600 [ 321.142307][ C1] ? retint_kernel+0x2b/0x2b [ 321.146892][ C1] ? kvm_set_memory_region+0x40/0x40 [ 321.152253][ C1] ksys_ioctl+0x11a/0x180 [ 321.156584][ C1] __x64_sys_ioctl+0x6f/0xb0 [ 321.161165][ C1] ? lockdep_hardirqs_on+0x417/0x5d0 [ 321.166442][ C1] do_syscall_64+0xf6/0x790 [ 321.170962][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 321.176847][ C1] RIP: 0033:0x444349 [ 321.180781][ C1] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 1b 0c fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 321.200384][ C1] RSP: 002b:00007ffc83efaa28 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 321.208798][ C1] RAX: ffffffffffffffda RBX: 00007ffc83efaa30 RCX: 0000000000444349 [ 321.216761][ C1] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006 [ 321.224731][ C1] RBP: 0000000000000000 R08: 0000000000402070 R09: 0000000000402070 [ 321.232701][ C1] R10: fffffffffffffffe R11: 0000000000000246 R12: 00000000004053f0 [ 321.240674][ C1] R13: 0000000000405480 R14: 0000000000000000 R15: 0000000000000000