[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.271366] audit: type=1800 audit(1545798849.294:25): pid=7719 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.291644] audit: type=1800 audit(1545798849.304:26): pid=7719 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.311657] audit: type=1800 audit(1545798849.304:27): pid=7719 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 44.381880] sshd (7857) used greatest stack depth: 15720 bytes left Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. executing program [ 61.032865] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details. [ 61.125800] WARNING: CPU: 0 PID: 7873 at arch/x86/kvm/mmu.c:830 mmu_spte_clear_track_bits+0x45f/0x520 [ 61.135242] Kernel panic - not syncing: panic_on_warn set ... [ 61.141112] CPU: 0 PID: 7873 Comm: syz-executor226 Not tainted 4.20.0-rc7-next-20181224 #188 [ 61.149842] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.159178] Call Trace: [ 61.161859] dump_stack+0x1d3/0x2c6 [ 61.165476] ? dump_stack_print_info.cold.1+0x20/0x20 [ 61.170818] panic+0x2ad/0x632 [ 61.174000] ? add_taint.cold.5+0x16/0x16 [ 61.178150] ? __warn.cold.8+0x5/0x4f [ 61.181935] ? __warn+0xe8/0x1d0 [ 61.185286] ? mmu_spte_clear_track_bits+0x45f/0x520 [ 61.190391] __warn.cold.8+0x20/0x4f [ 61.194120] ? rcu_softirq_qs+0x20/0x20 [ 61.198093] ? mmu_spte_clear_track_bits+0x45f/0x520 [ 61.203285] report_bug+0x254/0x2d0 [ 61.206902] do_error_trap+0x11b/0x200 [ 61.210771] do_invalid_op+0x36/0x40 [ 61.214466] ? mmu_spte_clear_track_bits+0x45f/0x520 [ 61.219560] invalid_op+0x14/0x20 [ 61.222993] RIP: 0010:mmu_spte_clear_track_bits+0x45f/0x520 [ 61.228696] Code: 40 ff ff ff 31 ff 44 89 fe 48 ba 00 00 00 00 00 fc ff df c6 04 10 f8 e8 4f ad 70 00 45 85 ff 0f 85 65 fd ff ff e8 31 ac 70 00 <0f> 0b e9 59 fd ff ff e8 25 ac 70 00 4c 89 ef e8 4d 33 f7 ff 31 f6 [ 61.247694] RSP: 0018:ffff8881b9df6860 EFLAGS: 00010293 [ 61.253203] RAX: ffff8881b1b6c3c0 RBX: 40000001af5e8c77 RCX: ffffffff81114481 [ 61.260466] RDX: 0000000000000000 RSI: ffffffff8111448f RDI: 0000000000000005 [ 61.267726] RBP: ffff8881b9df6978 R08: ffff8881b1b6c3c0 R09: fffff94000d7af46 [ 61.275138] R10: fffff94000d7af46 R11: ffffea0006bd7a37 R12: 1ffff110373bed0e [ 61.282388] R13: 00000000001af5e8 R14: ffff8881b9df6950 R15: 0000000000000000 [ 61.289784] ? mmu_spte_clear_track_bits+0x451/0x520 [ 61.294878] ? mmu_spte_clear_track_bits+0x45f/0x520 [ 61.299981] ? mmu_spte_update+0x340/0x340 [ 61.304202] ? mmu_shrink_scan+0xb70/0xb70 [ 61.308444] ? kasan_check_write+0x14/0x20 [ 61.312687] ? graph_lock+0x9c/0x270 [ 61.316402] ? do_raw_spin_trylock+0x270/0x270 [ 61.320982] ? add_lock_to_list.isra.26+0x4b0/0x4b0 [ 61.326104] ? __this_cpu_preempt_check+0x1c/0x20 [ 61.331048] drop_spte+0x24/0x220 [ 61.334492] mmu_page_zap_pte+0x2d3/0x3a0 [ 61.338873] ? drop_spte+0x220/0x220 [ 61.342568] ? __lock_is_held+0xb5/0x140 [ 61.346623] kvm_mmu_prepare_zap_page+0x1f9/0x1530 [ 61.351541] ? kvm_handle_hva_range+0x780/0x780 [ 61.356326] ? __lock_acquire+0x62f/0x4c20 [ 61.360553] ? lockdep_hardirqs_on+0x421/0x5c0 [ 61.365133] ? trace_hardirqs_on+0xbd/0x310 [ 61.369439] ? mark_held_locks+0x130/0x130 [ 61.373686] ? graph_lock+0x270/0x270 [ 61.377518] ? mark_held_locks+0x130/0x130 [ 61.381867] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 61.387394] ? check_preemption_disabled+0x48/0x280 [ 61.392393] ? print_usage_bug+0xc0/0xc0 [ 61.396438] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 61.402075] ? kvm_make_vcpus_request_mask+0x48c/0x5a0 [ 61.407350] ? gfn_to_pfn_atomic+0x7a0/0x7a0 [ 61.411741] ? graph_lock+0x270/0x270 [ 61.415531] ? lock_acquire+0x1ed/0x520 [ 61.419486] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 61.425010] ? check_preemption_disabled+0x48/0x280 [ 61.430031] ? kvm_vcpu_on_spin+0x830/0x830 [ 61.434333] ? kvm_make_all_cpus_request+0x82/0xb0 [ 61.439250] ? kvm_make_vcpus_request_mask+0x5a0/0x5a0 [ 61.444530] ? kvm_vcpu_on_spin+0x830/0x830 [ 61.448846] kvm_mmu_invalidate_zap_all_pages+0x348/0x7b0 [ 61.454375] ? kvm_mmu_zap_collapsible_sptes+0x850/0x850 [ 61.459816] ? kvm_vcpu_on_spin+0x830/0x830 [ 61.464124] ? lock_downgrade+0x900/0x900 [ 61.468371] ? lock_acquire+0x1ed/0x520 [ 61.472329] ? lock_release+0xa00/0xa00 [ 61.476292] ? lock_release+0xa00/0xa00 [ 61.480252] ? kvm_vcpu_on_spin+0x830/0x830 [ 61.484628] kvm_arch_flush_shadow_all+0x15/0x20 [ 61.489372] kvm_mmu_notifier_release+0x59/0x90 [ 61.494100] ? kvm_vcpu_on_spin+0x830/0x830 [ 61.498427] __mmu_notifier_release+0x1e9/0x630 [ 61.503087] ? __khugepaged_exit+0x4be/0x6a0 [ 61.507482] ? __mmu_notifier_invalidate_range_end+0x490/0x490 [ 61.513439] ? lock_release+0xa00/0xa00 [ 61.517397] ? arch_local_save_flags+0x40/0x40 [ 61.521965] ? __khugepaged_exit+0x4ae/0x6a0 [ 61.526357] ? lock_downgrade+0x900/0x900 [ 61.530623] ? find_held_lock+0x36/0x1c0 [ 61.534688] ? up_write+0x7b/0x220 [ 61.538213] ? down_write_nested+0x130/0x130 [ 61.542602] ? down_read+0x120/0x120 [ 61.546301] exit_mmap+0xa1/0x590 [ 61.549749] ? __ia32_sys_munmap+0x80/0x80 [ 61.553981] ? __khugepaged_exit+0x455/0x6a0 [ 61.558378] ? uprobe_clear_state+0x281/0x390 [ 61.562859] ? ___might_sleep+0x1ed/0x300 [ 61.566990] ? hugepage_madvise+0x100/0x100 [ 61.571300] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 61.576824] ? mm_update_next_owner+0x736/0x990 [ 61.581479] ? __might_sleep+0x95/0x190 [ 61.585438] mmput+0x247/0x610 [ 61.588699] ? lock_downgrade+0x900/0x900 [ 61.592838] ? set_mm_exe_file+0x200/0x200 [ 61.597136] ? kasan_check_read+0x11/0x20 [ 61.601269] ? do_raw_spin_unlock+0xa7/0x330 [ 61.605847] ? do_raw_spin_trylock+0x270/0x270 [ 61.610564] ? up_read_non_owner+0x100/0x100 [ 61.614963] ? __down_interruptible+0x700/0x700 [ 61.619731] do_exit+0xdcc/0x25f0 [ 61.623180] ? do_raw_spin_unlock+0xa7/0x330 [ 61.627571] ? mm_update_next_owner+0x990/0x990 [ 61.632362] ? graph_lock+0x270/0x270 [ 61.636149] ? find_held_lock+0x36/0x1c0 [ 61.640278] ? __lock_acquire+0x62f/0x4c20 [ 61.644622] ? lock_downgrade+0x900/0x900 [ 61.648765] ? mark_held_locks+0x130/0x130 [ 61.652985] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 61.658161] ? drop_futex_key_refs.isra.15+0x6d/0xe0 [ 61.663248] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 61.668778] ? futex_wait+0x5ec/0xa50 [ 61.672569] ? futex_wait_setup+0x3e0/0x3e0 [ 61.676876] ? kfree+0x107/0x230 [ 61.680227] ? drop_futex_key_refs.isra.15+0x6d/0xe0 [ 61.685310] ? futex_wake+0x304/0x760 [ 61.689099] ? graph_lock+0x270/0x270 [ 61.692887] ? memset+0x31/0x40 [ 61.696156] ? find_held_lock+0x36/0x1c0 [ 61.700310] ? get_signal+0x95b/0x1980 [ 61.704194] ? _raw_spin_unlock_irq+0x27/0x80 [ 61.708684] ? _raw_spin_unlock_irq+0x27/0x80 [ 61.713167] do_group_exit+0x177/0x440 [ 61.717046] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 61.722478] ? __ia32_sys_exit+0x50/0x50 [ 61.726535] get_signal+0x8b0/0x1980 [ 61.730274] ? ptrace_notify+0x130/0x130 [ 61.734331] ? ksys_dup3+0x680/0x680 [ 61.738035] do_signal+0x9c/0x21c0 [ 61.741562] ? kvm_debugfs_release+0x90/0x90 [ 61.745953] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 61.751479] ? do_vfs_ioctl+0x201/0x1790 [ 61.755551] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 61.761074] ? setup_sigcontext+0x7d0/0x7d0 [ 61.765394] ? ioctl_preallocate+0x300/0x300 [ 61.769793] ? exit_to_usermode_loop+0x8c/0x380 [ 61.774564] ? exit_to_usermode_loop+0x8c/0x380 [ 61.779221] ? lockdep_hardirqs_on+0x421/0x5c0 [ 61.783930] ? trace_hardirqs_on+0xbd/0x310 [ 61.788238] ? kmem_cache_free+0x24f/0x290 [ 61.792483] ? do_syscall_64+0x6be/0x820 [ 61.796766] ? __x64_sys_futex+0x476/0x690 [ 61.800997] exit_to_usermode_loop+0x2e5/0x380 [ 61.805690] ? syscall_trace_enter+0x1260/0x1260 [ 61.810452] ? ksys_ioctl+0x81/0xd0 [ 61.814069] do_syscall_64+0x6be/0x820 [ 61.818085] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 61.823454] ? syscall_return_slowpath+0x5e0/0x5e0 [ 61.828385] ? trace_hardirqs_on_caller+0x310/0x310 [ 61.833398] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 61.838393] ? recalc_sigpending_tsk+0x180/0x180 [ 61.843128] ? __switch_to_asm+0x40/0x70 [ 61.847170] ? __switch_to_asm+0x34/0x70 [ 61.851327] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 61.856159] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 61.861327] RIP: 0033:0x448c79 [ 61.864503] Code: e8 3c af 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 4b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 61.883391] RSP: 002b:00007fe328b1fcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 61.891081] RAX: fffffffffffffe00 RBX: 00000000006ddc58 RCX: 0000000000448c79 [ 61.898379] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006ddc58 [ 61.905637] RBP: 00000000006ddc50 R08: 0000000000000000 R09: 0000000000000000 [ 61.912887] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc5c [ 61.920182] R13: 00007ffcaa19611f R14: 00007fe328b209c0 R15: 00000000006ddd4c [ 61.928515] Kernel Offset: disabled [ 61.932210] Rebooting in 86400 seconds..