[....] Starting enhanced syslogd: rsyslogd[ 12.661438] audit: type=1400 audit(1515021238.005:5): avc: denied { syslog } for pid=3341 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 18.382608] audit: type=1400 audit(1515021243.726:6): avc: denied { map } for pid=3480 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 '10.128.15.225' (ECDSA) to the list of known hosts. executing program executing program [ 24.566316] audit: type=1400 audit(1515021249.910:7): avc: denied { map } for pid=3495 comm="syzkaller013577" path="/root/syzkaller013577702" 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 executing program [ 24.610899] 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 executing program executing program executing program executing program executing program executing program executing program executing program [ 25.353430] kasan: CONFIG_KASAN_INLINE enabled [ 25.358046] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.365383] general protection fault: 0000 [#1] SMP KASAN [ 25.370888] Dumping ftrace buffer: [ 25.374391] (ftrace buffer empty) [ 25.378074] Modules linked in: [ 25.381238] CPU: 1 PID: 3560 Comm: syzkaller013577 Not tainted 4.15.0-rc6+ #156 [ 25.388647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.397979] RIP: 0010:native_write_cr4+0x4/0x10 [ 25.402610] RSP: 0018:ffff8801d997efa8 EFLAGS: 00010093 [ 25.407940] RAX: ffff8801bcf581c0 RBX: 00000000001606e0 RCX: ffffffff811a3242 [ 25.415179] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606e0 [ 25.422415] RBP: ffff8801d997efa8 R08: 1ffff1003b32fd51 R09: 0000000000000004 [ 25.429667] R10: ffff8801d997ef18 R11: 0000000000000004 R12: 0000000000000093 [ 25.436906] R13: ffff8801bcf581c0 R14: ffff8801db31a130 R15: ffff8801db31a130 [ 25.444145] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.452337] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 25.458186] CR2: 0000000000000000 CR3: 0000000006822001 CR4: 00000000001626e0 [ 25.465425] Call Trace: [ 25.467984] hardware_disable+0x34a/0x4b0 [ 25.472118] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 25.476608] kvm_arch_hardware_disable+0x35/0xd0 [ 25.481349] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 25.485815] hardware_disable_nolock+0x30/0x40 [ 25.490363] on_each_cpu+0xca/0x1b0 [ 25.493957] hardware_disable_all_nolock+0x3e/0x50 [ 25.498853] kvm_put_kvm+0x956/0xdf0 [ 25.502538] ? kvm_clear_guest+0xb0/0xb0 [ 25.506570] ? kvm_irqfd_release+0xd1/0x120 [ 25.510860] ? lock_downgrade+0x980/0x980 [ 25.515001] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.519468] ? kvm_irqfd_release+0xdd/0x120 [ 25.523753] ? kvm_irqfd_release+0xdd/0x120 [ 25.528057] ? kvm_put_kvm+0xdf0/0xdf0 [ 25.531912] kvm_vm_release+0x42/0x50 [ 25.535688] __fput+0x327/0x7e0 [ 25.538937] ? fput+0x140/0x140 [ 25.542185] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.548035] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.552501] ____fput+0x15/0x20 [ 25.555755] task_work_run+0x199/0x270 [ 25.559618] ? task_work_cancel+0x210/0x210 [ 25.563920] ? _raw_spin_unlock+0x22/0x30 [ 25.568041] ? switch_task_namespaces+0x87/0xc0 [ 25.572684] do_exit+0x9bb/0x1ad0 [ 25.576107] ? find_held_lock+0x35/0x1d0 [ 25.580137] ? mm_update_next_owner+0x930/0x930 [ 25.584774] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.589933] ? lock_downgrade+0x980/0x980 [ 25.594071] ? __unqueue_futex+0x1c0/0x290 [ 25.598269] ? lock_release+0xa40/0xa40 [ 25.602209] ? fault_in_user_writeable+0x90/0x90 [ 25.606934] ? __pv_queued_spin_lock_slowpath+0x1480/0x1480 [ 25.612618] ? futex_wake+0x680/0x680 [ 25.616416] ? perf_trace_lock+0xd6/0x900 [ 25.620533] ? futex_wait+0x6a9/0x9a0 [ 25.624304] ? trace_event_raw_event_lock+0x340/0x340 [ 25.629462] ? check_noncircular+0x20/0x20 [ 25.633672] ? hash_futex+0x15/0x210 [ 25.637351] ? drop_futex_key_refs.isra.12+0x63/0xb0 [ 25.642428] ? futex_wake+0x2ca/0x680 [ 25.646196] ? fd_install+0x4d/0x60 [ 25.649798] ? find_held_lock+0x35/0x1d0 [ 25.653828] ? retint_kernel+0x10/0x10 [ 25.657683] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.662667] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.667396] do_group_exit+0x149/0x400 [ 25.671251] ? SyS_exit+0x30/0x30 [ 25.674673] ? _raw_spin_unlock_irq+0x56/0x70 [ 25.679135] get_signal+0x73f/0x16c0 [ 25.682821] ? ptrace_notify+0x130/0x130 [ 25.686848] ? lock_release+0xa40/0xa40 [ 25.690788] ? __lock_is_held+0xb6/0x140 [ 25.694822] ? __fget+0x35c/0x570 [ 25.698245] do_signal+0x90/0x1eb0 [ 25.701757] ? iterate_fd+0x3f0/0x3f0 [ 25.705525] ? lock_downgrade+0x980/0x980 [ 25.709644] ? mntput+0x66/0x90 [ 25.712894] ? setup_sigcontext+0x7d0/0x7d0 [ 25.717181] ? lock_release+0xa40/0xa40 [ 25.721124] ? do_raw_spin_trylock+0x190/0x190 [ 25.725676] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 25.730572] ? selinux_file_ioctl+0x444/0x690 [ 25.735032] ? __fget_light+0x297/0x380 [ 25.738981] ? kvm_vm_compat_ioctl+0x29a/0x3f0 [ 25.743546] ? exit_to_usermode_loop+0x8c/0x310 [ 25.748186] exit_to_usermode_loop+0x214/0x310 [ 25.752747] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.758249] ? compat_SyS_ioctl+0x77/0x2a30 [ 25.762536] ? do_fast_syscall_32+0x156/0xf9d [ 25.767002] do_fast_syscall_32+0xbfd/0xf9d [ 25.771295] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.775852] ? syscall_return_slowpath+0x2ad/0x550 [ 25.780748] ? prepare_exit_to_usermode+0x340/0x340 [ 25.785732] ? sysret32_from_system_call+0x5/0x3b [ 25.790552] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.795379] entry_SYSENTER_compat+0x54/0x63 [ 25.799778] RIP: 0023:0xf7f0fc79 [ 25.803118] RSP: 002b:00000000f7f0b1dc EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 [ 25.810812] RAX: fffffffffffffe00 RBX: 00000000080fafe4 RCX: 0000000000000000 [ 25.818050] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000080fafe4 [ 25.825287] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 25.832523] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.839768] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.847017] 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 [ 25.866110] RIP: native_write_cr4+0x4/0x10 RSP: ffff8801d997efa8 [ 25.872230] ---[ end trace da6b91fef54780e9 ]--- [ 25.876960] Kernel panic - not syncing: Fatal exception [ 25.882323] Dumping ftrace buffer: [ 25.885831] (ftrace buffer empty) [ 25.889517] Kernel Offset: disabled [ 25.893114] Rebooting in 86400 seconds..