[?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. [ 18.605144] audit: type=1400 audit(1521166371.977:6): avc: denied { map } for pid=4190 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.17' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 30.404910] audit: type=1400 audit(1521166383.777:7): avc: denied { map } for pid=4206 comm="syzkaller898146" path="/root/syzkaller898146605" 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 [ 30.452733] kasan: CONFIG_KASAN_INLINE enabled [ 30.457351] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.464682] general protection fault: 0000 [#1] SMP KASAN [ 30.470189] Dumping ftrace buffer: [ 30.473702] (ftrace buffer empty) [ 30.477384] Modules linked in: [ 30.480548] CPU: 0 PID: 4206 Comm: syzkaller898146 Not tainted 4.16.0-rc5+ #355 [ 30.487960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.497290] RIP: 0010:native_write_cr4+0x4/0x10 [ 30.501936] RSP: 0018:ffff8801b6a87458 EFLAGS: 00010093 [ 30.507266] RAX: ffff8801b9660100 RBX: 00000000001606f0 RCX: ffffffff811a5f22 [ 30.514513] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606f0 [ 30.521754] RBP: ffff8801b6a87458 R08: 1ffff10036d50de7 R09: 0000000000000004 [ 30.528991] R10: ffff8801b6a873c8 R11: 0000000000000004 R12: 0000000000000093 [ 30.536233] R13: ffff8801b9660100 R14: ffff8801db21d130 R15: ffff8801db21d130 [ 30.543473] FS: 000000000166d880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.551667] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.557515] CR2: 0000000000000000 CR3: 0000000006e22004 CR4: 00000000001626f0 [ 30.564753] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.571991] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.579230] Call Trace: [ 30.581789] hardware_disable+0x34a/0x4b0 [ 30.585910] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 30.590377] kvm_arch_hardware_disable+0x35/0xd0 [ 30.595101] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 30.599594] hardware_disable_nolock+0x30/0x40 [ 30.604150] on_each_cpu+0xca/0x1b0 [ 30.607744] hardware_disable_all_nolock+0x3e/0x50 [ 30.612642] kvm_put_kvm+0x956/0xdf0 [ 30.616329] ? kvm_clear_guest+0xb0/0xb0 [ 30.620360] ? kvm_irqfd_release+0xd1/0x120 [ 30.624651] ? lock_downgrade+0x980/0x980 [ 30.628777] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.633243] ? kvm_irqfd_release+0xdd/0x120 [ 30.637534] ? kvm_irqfd_release+0xdd/0x120 [ 30.641823] ? kvm_put_kvm+0xdf0/0xdf0 [ 30.645676] kvm_vm_release+0x42/0x50 [ 30.649444] __fput+0x327/0x7e0 [ 30.652694] ? fput+0x140/0x140 [ 30.655941] ? check_same_owner+0x320/0x320 [ 30.660229] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.664693] ____fput+0x15/0x20 [ 30.667940] task_work_run+0x199/0x270 [ 30.671796] ? task_work_cancel+0x210/0x210 [ 30.676085] ? _raw_spin_unlock+0x22/0x30 [ 30.680202] ? switch_task_namespaces+0x87/0xc0 [ 30.684842] do_exit+0x9bb/0x1ad0 [ 30.688263] ? kvm_vcpu_fault+0x520/0x520 [ 30.692381] ? mm_update_next_owner+0x930/0x930 [ 30.697019] ? lock_downgrade+0x980/0x980 [ 30.701168] ? _raw_spin_unlock+0x22/0x30 [ 30.705296] ? __handle_mm_fault+0x5ba/0x38c0 [ 30.709764] ? __pmd_alloc+0x4e0/0x4e0 [ 30.713626] ? trace_hardirqs_off+0x10/0x10 [ 30.717915] ? trace_hardirqs_off+0x10/0x10 [ 30.722206] ? find_held_lock+0x35/0x1d0 [ 30.726236] ? handle_mm_fault+0x35b/0xb10 [ 30.730438] ? find_held_lock+0x35/0x1d0 [ 30.734470] ? __do_page_fault+0x5f7/0xc90 [ 30.738674] ? user_return_notifier_unregister+0x23d/0x360 [ 30.744268] ? uprobe_post_sstep_notifier+0x120/0x120 [ 30.749424] ? kvm_vcpu_fault+0x520/0x520 [ 30.753539] ? do_vfs_ioctl+0x486/0x1520 [ 30.757564] ? handle_mm_fault+0x465/0xb10 [ 30.761767] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 30.766664] ? kvm_on_user_return+0xe1/0x3c0 [ 30.771043] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.776029] ? trace_hardirqs_on+0xd/0x10 [ 30.780142] ? kvm_on_user_return+0x286/0x3c0 [ 30.784611] do_group_exit+0x149/0x400 [ 30.788464] ? trace_hardirqs_off+0xd/0x10 [ 30.792667] ? exit_to_usermode_loop+0x198/0x2f0 [ 30.797391] ? SyS_exit+0x30/0x30 [ 30.800816] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 30.806321] ? do_syscall_64+0xb7/0x940 [ 30.810261] ? do_group_exit+0x400/0x400 [ 30.814291] SyS_exit_group+0x1d/0x20 [ 30.818057] do_syscall_64+0x281/0x940 [ 30.821922] ? __do_page_fault+0xc90/0xc90 [ 30.826131] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.830860] ? syscall_return_slowpath+0x550/0x550 [ 30.835761] ? syscall_return_slowpath+0x2ac/0x550 [ 30.840660] ? prepare_exit_to_usermode+0x350/0x350 [ 30.845648] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 30.850986] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.855800] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 30.860958] RIP: 0033:0x441c78 [ 30.864117] RSP: 002b:00007ffd81e007c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.871793] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c78 [ 30.879032] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.886270] RBP: 00000000004c1928 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.893508] R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000001 [ 30.900747] R13: 00000000006d31a0 R14: 0000000000000000 R15: 0000000000000000 [ 30.907993] 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 [ 30.927062] RIP: native_write_cr4+0x4/0x10 RSP: ffff8801b6a87458 [ 30.933178] ---[ end trace f3c8ee5319a86168 ]--- [ 30.937896] Kernel panic - not syncing: Fatal exception [ 30.943568] Dumping ftrace buffer: [ 30.947075] (ftrace buffer empty) [ 30.950753] Kernel Offset: disabled [ 30.954348] Rebooting in 86400 seconds..