[....] Starting enhanced syslogd: rsyslogd[ 11.258728] audit: type=1400 audit(1515268399.092:5): avc: denied { syslog } for pid=3338 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: [ 15.497454] audit: type=1400 audit(1515268403.331:6): avc: denied { map } for pid=3476 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 '10.128.0.4' (ECDSA) to the list of known hosts. executing program [ 21.659413] audit: type=1400 audit(1515268409.493:7): avc: denied { map } for pid=3490 comm="syzkaller163853" path="/root/syzkaller163853613" 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 [ 21.692710] kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 22.297548] kasan: CONFIG_KASAN_INLINE enabled [ 22.302157] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 22.309487] general protection fault: 0000 [#1] SMP KASAN [ 22.314987] Dumping ftrace buffer: [ 22.318492] (ftrace buffer empty) [ 22.322168] Modules linked in: [ 22.325328] CPU: 1 PID: 3527 Comm: syzkaller163853 Not tainted 4.15.0-rc6+ #250 [ 22.332735] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.342062] RIP: 0010:native_write_cr4+0x4/0x10 [ 22.346697] RSP: 0018:ffff8801d66ef068 EFLAGS: 00010093 [ 22.352028] RAX: ffff8801bc080640 RBX: 00000000001606e0 RCX: ffffffff811a32c2 [ 22.359264] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606e0 [ 22.366500] RBP: ffff8801d66ef068 R08: 1ffff1003acddd69 R09: 0000000000000004 [ 22.373734] R10: ffff8801d66eefd8 R11: 0000000000000004 R12: 0000000000000093 [ 22.380967] R13: ffff8801bc080640 R14: ffff8801db31d130 R15: ffff8801db31d130 [ 22.388201] FS: 00007f0593113700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 22.396390] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.402237] CR2: 0000000000000000 CR3: 0000000006822006 CR4: 00000000001626e0 [ 22.409474] Call Trace: [ 22.412031] hardware_disable+0x34a/0x4b0 [ 22.416147] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 22.420609] kvm_arch_hardware_disable+0x35/0xd0 [ 22.425328] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 22.429787] hardware_disable_nolock+0x30/0x40 [ 22.434333] on_each_cpu+0xca/0x1b0 [ 22.437925] hardware_disable_all_nolock+0x3e/0x50 [ 22.442819] kvm_put_kvm+0x956/0xdf0 [ 22.446513] ? kvm_clear_guest+0xb0/0xb0 [ 22.451424] ? kvm_irqfd_release+0xd1/0x120 [ 22.457462] ? lock_downgrade+0x980/0x980 [ 22.461583] ? _raw_spin_unlock_irq+0x27/0x70 [ 22.466046] ? kvm_irqfd_release+0xdd/0x120 [ 22.470332] ? kvm_irqfd_release+0xdd/0x120 [ 22.474618] ? kvm_put_kvm+0xdf0/0xdf0 [ 22.478470] kvm_vm_release+0x42/0x50 [ 22.482236] __fput+0x327/0x7e0 [ 22.485482] ? fput+0x140/0x140 [ 22.488729] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 22.495359] ? _raw_spin_unlock_irq+0x27/0x70 [ 22.501558] ____fput+0x15/0x20 [ 22.505249] task_work_run+0x199/0x270 [ 22.509102] ? task_work_cancel+0x210/0x210 [ 22.513390] ? _raw_spin_unlock+0x22/0x30 [ 22.517500] ? switch_task_namespaces+0x87/0xc0 [ 22.522135] do_exit+0x9bb/0x1ad0 [ 22.525556] ? mm_update_next_owner+0x930/0x930 [ 22.530191] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 22.535345] ? __might_sleep+0x95/0x190 [ 22.539287] ? find_held_lock+0x35/0x1d0 [ 22.543316] ? futex_wait+0x402/0x9a0 [ 22.547079] ? lock_downgrade+0x980/0x980 [ 22.551191] ? __unqueue_futex+0x1c0/0x290 [ 22.555388] ? lock_release+0xa40/0xa40 [ 22.559327] ? fault_in_user_writeable+0x90/0x90 [ 22.564050] ? do_raw_spin_trylock+0x190/0x190 [ 22.568597] ? futex_wake+0x680/0x680 [ 22.572366] ? check_noncircular+0x20/0x20 [ 22.576571] ? drop_futex_key_refs.isra.12+0x63/0xb0 [ 22.581639] ? futex_wait+0x6a9/0x9a0 [ 22.585411] ? find_held_lock+0x35/0x1d0 [ 22.589444] ? get_signal+0x7ae/0x16c0 [ 22.593295] ? lock_downgrade+0x980/0x980 [ 22.597412] do_group_exit+0x149/0x400 [ 22.601266] ? do_raw_spin_trylock+0x190/0x190 [ 22.605812] ? SyS_exit+0x30/0x30 [ 22.609230] ? _raw_spin_unlock_irq+0x27/0x70 [ 22.613691] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 22.618673] get_signal+0x73f/0x16c0 [ 22.622356] ? ptrace_notify+0x130/0x130 [ 22.626384] ? exit_robust_list+0x240/0x240 [ 22.630674] ? __sched_text_start+0x8/0x8 [ 22.634790] ? __fget+0x333/0x570 [ 22.638208] ? lock_downgrade+0x980/0x980 [ 22.642325] do_signal+0x90/0x1eb0 [ 22.645831] ? __lock_is_held+0xb6/0x140 [ 22.649860] ? setup_sigcontext+0x7d0/0x7d0 [ 22.654151] ? schedule+0xf5/0x430 [ 22.657656] ? __schedule+0x2060/0x2060 [ 22.662445] ? iterate_fd+0x3f0/0x3f0 [ 22.667347] ? finish_task_switch+0x1d3/0x740 [ 22.671810] ? exit_to_usermode_loop+0x8c/0x310 [ 22.676447] exit_to_usermode_loop+0x214/0x310 [ 22.680990] ? ioctl_preallocate+0x2b0/0x2b0 [ 22.685367] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 22.690870] ? selinux_capable+0x40/0x40 [ 22.694902] syscall_return_slowpath+0x490/0x550 [ 22.699622] ? prepare_exit_to_usermode+0x340/0x340 [ 22.704603] ? entry_SYSCALL_64_fastpath+0x6d/0x9a [ 22.709505] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 22.714488] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 22.719216] entry_SYSCALL_64_fastpath+0x98/0x9a [ 22.723942] RIP: 0033:0x44cb09 [ 22.727096] RSP: 002b:00007f0593112da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 22.734766] RAX: fffffffffffffe00 RBX: 00000000006dec54 RCX: 000000000044cb09 [ 22.742001] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dec54 [ 22.749240] RBP: 00000000006dec50 R08: 0000000000000000 R09: 0000000000000000 [ 22.756474] R10: 0000000000000000 R11: 0000000000000246 R12: 234423436d63702f [ 22.763709] R13: 646e732f7665642f R14: 6d766b2f7665642f R15: 0000000000000009 [ 22.770949] 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 [ 22.793927] RIP: native_write_cr4+0x4/0x10 RSP: ffff8801d66ef068 [ 22.800039] ---[ end trace 95f03435f9ee1872 ]--- [ 22.804758] Kernel panic - not syncing: Fatal exception [ 22.810504] Dumping ftrace buffer: [ 22.814014] (ftrace buffer empty) [ 22.817689] Kernel Offset: disabled [ 22.821279] Rebooting in 86400 seconds..