[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.314948][ T26] audit: type=1800 audit(1561241892.598:25): pid=8791 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.357477][ T26] audit: type=1800 audit(1561241892.608:26): pid=8791 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.402906][ T26] audit: type=1800 audit(1561241892.608:27): pid=8791 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 Warning: Permanently added '10.128.1.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.773506][ T8945] 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. [ 69.811282][ T8945] BUG: unable to handle page fault for address: ffffed12fb15ea1f [ 69.819010][ T8945] #PF: supervisor read access in kernel mode [ 69.825099][ T8945] #PF: error_code(0x0000) - not-present page [ 69.831049][ T8945] PGD 21fff0067 P4D 21fff0067 PUD 0 [ 69.836329][ T8945] Oops: 0000 [#1] PREEMPT SMP KASAN [ 69.841505][ T8945] CPU: 0 PID: 8945 Comm: syz-executor116 Not tainted 5.2.0-rc5+ #57 [ 69.849456][ T8945] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.859587][ T8945] RIP: 0010:coalesced_mmio_write+0x28a/0x4d0 [ 69.865542][ T8945] Code: 38 d0 7c 08 84 d2 0f 85 55 02 00 00 41 8b 47 04 48 8d 14 40 49 8d 7c d7 08 48 ba 00 00 00 00 00 fc ff df 48 89 fe 48 c1 ee 03 <80> 3c 16 00 0f 85 1b 02 00 00 48 8d 14 40 48 be 00 00 00 00 00 fc [ 69.885225][ T8945] RSP: 0018:ffff8880a045f170 EFLAGS: 00010a02 [ 69.891268][ T8945] RAX: 00000000f7d5760a RBX: 0000000000000000 RCX: ffffffff81080faa [ 69.899218][ T8945] RDX: dffffc0000000000 RSI: 1ffff112fb15ea1f RDI: ffff8897d8af50f8 [ 69.907167][ T8945] RBP: ffff8880a045f1c0 R08: ffff888089e483c0 R09: 0000000000000000 [ 69.915114][ T8945] R10: ffffed101408be1b R11: 0000000000000003 R12: 0000000000000001 [ 69.923088][ T8945] R13: ffff8880a55dbf10 R14: 0000000000000001 R15: ffff88809cac4000 [ 69.931039][ T8945] FS: 000055555573a940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 69.939940][ T8945] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.946516][ T8945] CR2: ffffed12fb15ea1f CR3: 00000000a0aee000 CR4: 00000000001426f0 [ 69.954462][ T8945] Call Trace: [ 69.957740][ T8945] ? coalesced_mmio_destructor+0x170/0x170 [ 69.963550][ T8945] __kvm_io_bus_write+0x29b/0x380 [ 69.968560][ T8945] kvm_io_bus_write+0x15c/0x290 [ 69.973392][ T8945] ? __bpf_trace_kvm_async_get_page_class+0x30/0x30 [ 69.979961][ T8945] write_mmio+0x175/0x4e0 [ 69.984284][ T8945] emulator_read_write_onepage+0x429/0xd50 [ 69.990067][ T8945] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.996286][ T8945] emulator_read_write+0x1b7/0x5a0 [ 70.001375][ T8945] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 70.007591][ T8945] emulator_write_emulated+0x3c/0x50 [ 70.012857][ T8945] segmented_write+0xf0/0x150 [ 70.017513][ T8945] ? em_fxsave+0x50/0x50 [ 70.021806][ T8945] ? memcpy+0x46/0x50 [ 70.025766][ T8945] writeback+0x3f4/0x6a0 [ 70.030003][ T8945] ? __emulate_int_real+0x6c0/0x6c0 [ 70.035177][ T8945] ? emulator_read_gpr+0x80/0xc0 [ 70.040095][ T8945] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 70.046326][ T8945] ? fastop+0x18d/0x2b0 [ 70.050460][ T8945] ? em_salc+0x8/0x8 [ 70.054333][ T8945] x86_emulate_insn+0x1de1/0x48f0 [ 70.059338][ T8945] ? init_decode_cache+0xc0/0xc0 [ 70.064252][ T8945] x86_emulate_instruction+0xca3/0x1c50 [ 70.069797][ T8945] ? ept_page_fault+0x1560/0x1560 [ 70.074800][ T8945] ? write_emulate+0x40/0x40 [ 70.079377][ T8945] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 70.085086][ T8945] ? mmio_info_in_cache+0x143/0x560 [ 70.090263][ T8945] kvm_mmu_page_fault+0x370/0x1870 [ 70.095349][ T8945] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 70.101567][ T8945] ? kvm_mmu_remote_flush_or_zap+0x9e/0xf0 [ 70.107351][ T8945] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 70.113584][ T8945] ? kvm_mmu_flush_or_zap+0x79/0xa0 [ 70.118762][ T8945] ? __kvm_mmu_zap_all+0x350/0x350 [ 70.123849][ T8945] ? mark_held_locks+0xf0/0xf0 [ 70.128590][ T8945] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 70.134807][ T8945] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 70.140526][ T8945] handle_ept_violation+0x1c8/0x500 [ 70.145703][ T8945] ? add_atomic_switch_msr.constprop.0+0xd70/0xd70 [ 70.152219][ T8945] vmx_handle_exit+0x280/0x1540 [ 70.157052][ T8945] vcpu_enter_guest+0x1174/0x5f40 [ 70.162058][ T8945] ? emulator_read_emulated+0x50/0x50 [ 70.167425][ T8945] ? lock_acquire+0x16f/0x3f0 [ 70.172078][ T8945] ? kvm_check_async_pf_completion+0x2d8/0x440 [ 70.178218][ T8945] kvm_arch_vcpu_ioctl_run+0x423/0x1740 [ 70.183746][ T8945] ? kvm_arch_vcpu_ioctl_run+0x423/0x1740 [ 70.189447][ T8945] kvm_vcpu_ioctl+0x4dc/0xf90 [ 70.194100][ T8945] ? kvm_set_memory_region+0x50/0x50 [ 70.199364][ T8945] ? tomoyo_path_number_perm+0x263/0x520 [ 70.204973][ T8945] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 70.210759][ T8945] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 70.216456][ T8945] ? __set_current_blocked+0xe4/0x120 [ 70.221805][ T8945] ? kvm_set_memory_region+0x50/0x50 [ 70.227062][ T8945] do_vfs_ioctl+0xd5f/0x1380 [ 70.231633][ T8945] ? ioctl_preallocate+0x210/0x210 [ 70.236718][ T8945] ? __fdget+0x1b/0x20 [ 70.240768][ T8945] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 70.246985][ T8945] ? sockfd_lookup_light+0xcb/0x180 [ 70.252175][ T8945] ? __sys_sendmsg+0x131/0x1d0 [ 70.256918][ T8945] ? __ia32_sys_shutdown+0x80/0x80 [ 70.262029][ T8945] ? kasan_check_read+0x11/0x20 [ 70.266864][ T8945] ? tomoyo_file_ioctl+0x23/0x30 [ 70.271801][ T8945] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 70.278021][ T8945] ? security_file_ioctl+0x8d/0xc0 [ 70.283111][ T8945] ksys_ioctl+0xab/0xd0 [ 70.287264][ T8945] __x64_sys_ioctl+0x73/0xb0 [ 70.291884][ T8945] do_syscall_64+0xfd/0x680 [ 70.296379][ T8945] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.302249][ T8945] RIP: 0033:0x4444e9 [ 70.306120][ T8945] 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 [ 70.325720][ T8945] RSP: 002b:00007fff46b48808 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 70.334123][ T8945] RAX: ffffffffffffffda RBX: 00007fff46b48810 RCX: 00000000004444e9 [ 70.342071][ T8945] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 70.350033][ T8945] RBP: 0000000000000000 R08: 0000000000402240 R09: 0000000000402240 [ 70.357984][ T8945] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000405590 [ 70.365930][ T8945] R13: 0000000000405620 R14: 0000000000000000 R15: 0000000000000000 [ 70.373880][ T8945] Modules linked in: [ 70.377751][ T8945] CR2: ffffed12fb15ea1f [ 70.381885][ T8945] ---[ end trace 84ecc85af6872381 ]--- [ 70.387346][ T8945] RIP: 0010:coalesced_mmio_write+0x28a/0x4d0 [ 70.393320][ T8945] Code: 38 d0 7c 08 84 d2 0f 85 55 02 00 00 41 8b 47 04 48 8d 14 40 49 8d 7c d7 08 48 ba 00 00 00 00 00 fc ff df 48 89 fe 48 c1 ee 03 <80> 3c 16 00 0f 85 1b 02 00 00 48 8d 14 40 48 be 00 00 00 00 00 fc [ 70.412909][ T8945] RSP: 0018:ffff8880a045f170 EFLAGS: 00010a02 [ 70.418956][ T8945] RAX: 00000000f7d5760a RBX: 0000000000000000 RCX: ffffffff81080faa [ 70.426923][ T8945] RDX: dffffc0000000000 RSI: 1ffff112fb15ea1f RDI: ffff8897d8af50f8 [ 70.434874][ T8945] RBP: ffff8880a045f1c0 R08: ffff888089e483c0 R09: 0000000000000000 [ 70.442823][ T8945] R10: ffffed101408be1b R11: 0000000000000003 R12: 0000000000000001 [ 70.450770][ T8945] R13: ffff8880a55dbf10 R14: 0000000000000001 R15: ffff88809cac4000 [ 70.458724][ T8945] FS: 000055555573a940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 70.467628][ T8945] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 70.474184][ T8945] CR2: ffffed12fb15ea1f CR3: 00000000a0aee000 CR4: 00000000001426f0 [ 70.482153][ T8945] Kernel panic - not syncing: Fatal exception [ 70.489314][ T8945] Kernel Offset: disabled [ 70.493632][ T8945] Rebooting in 86400 seconds..