[....] Starting enhanced syslogd: rsyslogd[ 12.596758] audit: type=1400 audit(1515117755.701:5): avc: denied { syslog } for pid=3345 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: [ 19.117956] audit: type=1400 audit(1515117762.222:6): avc: denied { map } for pid=3486 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 '10.128.15.226' (ECDSA) to the list of known hosts. executing program [ 25.370720] audit: type=1400 audit(1515117768.475:7): avc: denied { map } for pid=3500 comm="syzkaller573453" path="/root/syzkaller573453767" 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 [ 25.404947] kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu [ 25.438058] kasan: CONFIG_KASAN_INLINE enabled [ 25.442693] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.450036] general protection fault: 0000 [#1] SMP KASAN [ 25.455546] Dumping ftrace buffer: [ 25.459052] (ftrace buffer empty) [ 25.462729] Modules linked in: [ 25.465891] CPU: 0 PID: 3504 Comm: syzkaller573453 Not tainted 4.15.0-rc6+ #248 [ 25.473300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.482638] RIP: 0010:native_write_cr4+0x4/0x10 [ 25.487273] RSP: 0018:ffff8801bee7f068 EFLAGS: 00010093 [ 25.492604] RAX: ffff8801bea3a3c0 RBX: 00000000001606f0 RCX: ffffffff811a3242 [ 25.499850] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606f0 [ 25.507087] RBP: ffff8801bee7f068 R08: 1ffff10037dcfd69 R09: 0000000000000004 [ 25.514334] R10: ffff8801bee7efd8 R11: 0000000000000004 R12: 0000000000000093 [ 25.521571] R13: ffff8801bea3a3c0 R14: ffff8801db21d130 R15: ffff8801db21d130 [ 25.528819] FS: 00007f9880b37700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.537024] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.542873] CR2: 00007f7e81061000 CR3: 0000000006822006 CR4: 00000000001626f0 [ 25.550123] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.557373] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.564608] Call Trace: [ 25.567171] hardware_disable+0x34a/0x4b0 [ 25.571289] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 25.575755] kvm_arch_hardware_disable+0x35/0xd0 [ 25.580478] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 25.584940] hardware_disable_nolock+0x30/0x40 [ 25.589490] on_each_cpu+0xca/0x1b0 [ 25.593086] hardware_disable_all_nolock+0x3e/0x50 [ 25.597983] kvm_put_kvm+0x956/0xdf0 [ 25.601669] ? kvm_clear_guest+0xb0/0xb0 [ 25.605714] ? kvm_irqfd_release+0xd1/0x120 [ 25.610004] ? lock_downgrade+0x980/0x980 [ 25.614137] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.618600] ? kvm_irqfd_release+0xdd/0x120 [ 25.622887] ? kvm_irqfd_release+0xdd/0x120 [ 25.627175] ? kvm_put_kvm+0xdf0/0xdf0 [ 25.631031] kvm_vm_release+0x42/0x50 [ 25.634804] __fput+0x327/0x7e0 [ 25.638061] ? fput+0x140/0x140 [ 25.641309] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.647163] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.651632] ____fput+0x15/0x20 [ 25.654881] task_work_run+0x199/0x270 [ 25.658739] ? task_work_cancel+0x210/0x210 [ 25.663033] ? _raw_spin_unlock+0x22/0x30 [ 25.667147] ? switch_task_namespaces+0x87/0xc0 [ 25.671788] do_exit+0x9bb/0x1ad0 [ 25.675210] ? mm_update_next_owner+0x930/0x930 [ 25.679848] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.685007] ? __might_sleep+0x95/0x190 [ 25.688967] ? find_held_lock+0x35/0x1d0 [ 25.693001] ? futex_wait+0x402/0x9a0 [ 25.696778] ? lock_downgrade+0x980/0x980 [ 25.700894] ? __unqueue_futex+0x1c0/0x290 [ 25.705095] ? lock_release+0xa40/0xa40 [ 25.709039] ? fault_in_user_writeable+0x90/0x90 [ 25.713766] ? do_raw_spin_trylock+0x190/0x190 [ 25.718326] ? futex_wake+0x680/0x680 [ 25.722096] ? check_noncircular+0x20/0x20 [ 25.726299] ? drop_futex_key_refs.isra.12+0x63/0xb0 [ 25.731378] ? futex_wait+0x6a9/0x9a0 [ 25.735153] ? find_held_lock+0x35/0x1d0 [ 25.739186] ? get_signal+0x7ae/0x16c0 [ 25.743047] ? lock_downgrade+0x980/0x980 [ 25.747177] do_group_exit+0x149/0x400 [ 25.751035] ? do_raw_spin_trylock+0x190/0x190 [ 25.755592] ? SyS_exit+0x30/0x30 [ 25.759017] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.763485] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.768471] get_signal+0x73f/0x16c0 [ 25.772158] ? ptrace_notify+0x130/0x130 [ 25.776192] ? exit_robust_list+0x240/0x240 [ 25.780481] ? find_held_lock+0x35/0x1d0 [ 25.784514] ? __fget+0x333/0x570 [ 25.787935] ? lock_downgrade+0x980/0x980 [ 25.792055] do_signal+0x90/0x1eb0 [ 25.795564] ? __lock_is_held+0xb6/0x140 [ 25.799597] ? setup_sigcontext+0x7d0/0x7d0 [ 25.803891] ? __fget+0x35c/0x570 [ 25.807316] ? iterate_fd+0x3f0/0x3f0 [ 25.811089] ? finish_task_switch+0x1d3/0x740 [ 25.815556] ? exit_to_usermode_loop+0x8c/0x310 [ 25.820215] exit_to_usermode_loop+0x214/0x310 [ 25.824778] ? ioctl_preallocate+0x2b0/0x2b0 [ 25.829154] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.834660] ? selinux_capable+0x40/0x40 [ 25.838704] syscall_return_slowpath+0x490/0x550 [ 25.843428] ? prepare_exit_to_usermode+0x340/0x340 [ 25.848412] ? entry_SYSCALL_64_fastpath+0x6d/0x9a [ 25.853313] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.858296] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.863030] entry_SYSCALL_64_fastpath+0x98/0x9a [ 25.867755] RIP: 0033:0x446189 [ 25.870922] RSP: 002b:00007f9880b36cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 25.878597] RAX: fffffffffffffe00 RBX: 00000000006dbc54 RCX: 0000000000446189 [ 25.885840] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dbc54 [ 25.893089] RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 [ 25.900343] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 25.907581] R13: 00007ffde5b5c24f R14: 00007f9880b379c0 R15: 000000000000000d [ 25.914829] 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 [ 25.933916] RIP: native_write_cr4+0x4/0x10 RSP: ffff8801bee7f068 [ 25.940038] ---[ end trace 523e3a85d5f72d2e ]--- [ 25.944767] Kernel panic - not syncing: Fatal exception [ 25.950508] Dumping ftrace buffer: [ 25.954025] (ftrace buffer empty) [ 25.957701] Kernel Offset: disabled [ 25.961294] Rebooting in 86400 seconds..