[....] Starting enhanced syslogd: rsyslogd[ 12.019815] audit: type=1400 audit(1515123256.295:5): avc: denied { syslog } for pid=3337 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?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: [ 16.660980] audit: type=1400 audit(1515123260.936:6): avc: denied { map } for pid=3475 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. executing program [ 23.021716] audit: type=1400 audit(1515123267.297:7): avc: denied { map } for pid=3489 comm="syzkaller725815" path="/root/syzkaller725815520" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 23.054571] kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu [ 23.087876] kasan: CONFIG_KASAN_INLINE enabled [ 23.092462] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 23.099788] general protection fault: 0000 [#1] SMP KASAN [ 23.105288] Dumping ftrace buffer: [ 23.108790] (ftrace buffer empty) [ 23.112465] Modules linked in: [ 23.115623] CPU: 0 PID: 3489 Comm: syzkaller725815 Not tainted 4.15.0-rc6+ #248 [ 23.123032] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.132359] RIP: 0010:native_write_cr4+0x4/0x10 [ 23.136989] RSP: 0018:ffff8801be5c75a0 EFLAGS: 00010093 [ 23.142318] RAX: ffff8801bea2a5c0 RBX: 00000000001606f0 RCX: ffffffff811a3242 [ 23.149550] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606f0 [ 23.156785] RBP: ffff8801be5c75a0 R08: 1ffff10037cb8e0f R09: 0000000000000004 [ 23.164020] R10: ffff8801be5c7510 R11: 0000000000000004 R12: 0000000000000093 [ 23.171254] R13: ffff8801bea2a5c0 R14: ffff8801db21d130 R15: ffff8801db21d130 [ 23.178495] FS: 00000000024a4880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.186684] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.192528] CR2: 0000000000000000 CR3: 0000000006822004 CR4: 00000000001626f0 [ 23.199768] Call Trace: [ 23.202322] hardware_disable+0x34a/0x4b0 [ 23.206437] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 23.210898] kvm_arch_hardware_disable+0x35/0xd0 [ 23.215624] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 23.220088] hardware_disable_nolock+0x30/0x40 [ 23.224634] on_each_cpu+0xca/0x1b0 [ 23.228227] hardware_disable_all_nolock+0x3e/0x50 [ 23.233120] kvm_put_kvm+0x956/0xdf0 [ 23.236802] ? kvm_clear_guest+0xb0/0xb0 [ 23.240834] ? kvm_irqfd_release+0xd1/0x120 [ 23.245121] ? lock_downgrade+0x980/0x980 [ 23.249242] ? _raw_spin_unlock_irq+0x27/0x70 [ 23.253708] ? kvm_irqfd_release+0xdd/0x120 [ 23.257990] ? kvm_irqfd_release+0xdd/0x120 [ 23.262277] ? kvm_put_kvm+0xdf0/0xdf0 [ 23.266127] kvm_vm_release+0x42/0x50 [ 23.269893] __fput+0x327/0x7e0 [ 23.273146] ? fput+0x140/0x140 [ 23.276391] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 23.282240] ? _raw_spin_unlock_irq+0x27/0x70 [ 23.286701] ____fput+0x15/0x20 [ 23.289946] task_work_run+0x199/0x270 [ 23.293801] ? task_work_cancel+0x210/0x210 [ 23.298087] ? _raw_spin_unlock+0x22/0x30 [ 23.302198] ? switch_task_namespaces+0x87/0xc0 [ 23.306834] do_exit+0x9bb/0x1ad0 [ 23.310251] ? trace_event_raw_event_kvm_age_page+0x340/0x340 [ 23.316100] ? mm_update_next_owner+0x930/0x930 [ 23.320747] ? mntput_no_expire+0x15e/0xa90 [ 23.325031] ? _raw_spin_unlock+0x22/0x30 [ 23.329146] ? mnt_get_count+0x150/0x150 [ 23.333173] ? find_held_lock+0x35/0x1d0 [ 23.337204] ? task_work_run+0x16c/0x270 [ 23.341229] ? lock_downgrade+0x980/0x980 [ 23.345339] ? mntput+0x66/0x90 [ 23.348583] ? lock_release+0xa40/0xa40 [ 23.352524] ? do_raw_spin_trylock+0x190/0x190 [ 23.357070] ? _raw_spin_unlock_irq+0x27/0x70 [ 23.361528] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 23.366507] ? trace_hardirqs_on+0xd/0x10 [ 23.370619] ? _raw_spin_unlock_irq+0x27/0x70 [ 23.375089] ? task_work_run+0x1f4/0x270 [ 23.379118] ? task_work_cancel+0x210/0x210 [ 23.383403] ? trace_event_raw_event_kvm_age_page+0x340/0x340 [ 23.389253] ? do_vfs_ioctl+0x486/0x1520 [ 23.393286] ? ioctl_preallocate+0x2b0/0x2b0 [ 23.397662] ? selinux_capable+0x40/0x40 [ 23.401687] ? __close_fd+0x222/0x360 [ 23.405454] do_group_exit+0x149/0x400 [ 23.409305] ? SyS_exit+0x30/0x30 [ 23.412729] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 23.417717] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 23.422437] SyS_exit_group+0x1d/0x20 [ 23.426203] entry_SYSCALL_64_fastpath+0x23/0x9a [ 23.430921] RIP: 0033:0x441c48 [ 23.434077] RSP: 002b:00007ffc4bfb8a98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 23.441748] RAX: ffffffffffffffda RBX: 00007ffc4bfb7650 RCX: 0000000000441c48 [ 23.448981] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 23.456216] RBP: 0000000000000006 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 23.463450] R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000000 [ 23.470685] R13: 0000000000000004 R14: 0000000000000004 R15: 000000002020c000 [ 23.477932] Code: 0f 1f 80 00 00 00 00 55 48 89 e5 0f 20 d8 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 0f 22 df 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 <0f> 22 e7 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 44 0f 20 c0 5d [ 23.497011] RIP: native_write_cr4+0x4/0x10 RSP: ffff8801be5c75a0 [ 23.503136] ---[ end trace 2f527c2b8e1ece1a ]--- [ 23.507853] Kernel panic - not syncing: Fatal exception [ 23.513635] Dumping ftrace buffer: [ 23.517140] (ftrace buffer empty) [ 23.520816] Kernel Offset: disabled [ 23.524406] Rebooting in 86400 seconds..