[....] Starting enhanced syslogd: rsyslogd[ 13.183698] audit: type=1400 audit(1516638638.228:5): avc: denied { syslog } for pid=3495 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: [ 19.441517] audit: type=1400 audit(1516638644.486:6): avc: denied { map } for pid=3633 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 '10.128.0.58' (ECDSA) to the list of known hosts. executing program executing program [ 26.088941] audit: type=1400 audit(1516638651.133:7): avc: denied { map } for pid=3647 comm="syzkaller445083" path="/root/syzkaller445083562" 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 [ 26.126511] kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu [ 26.152559] kasan: CONFIG_KASAN_INLINE enabled [ 26.157155] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.164487] general protection fault: 0000 [#1] SMP KASAN [ 26.169991] Dumping ftrace buffer: [ 26.173500] (ftrace buffer empty) [ 26.177178] Modules linked in: [ 26.180342] CPU: 1 PID: 3653 Comm: syzkaller445083 Not tainted 4.15.0-rc9+ #184 [ 26.187759] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.197097] RIP: 0010:native_write_cr4+0x4/0x10 [ 26.201734] RSP: 0018:ffff8801d980efa8 EFLAGS: 00010093 [ 26.207070] RAX: ffff8801d9a44340 RBX: 00000000001606e0 RCX: ffffffff811a32b2 [ 26.214313] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606e0 [ 26.221550] RBP: ffff8801d980efa8 R08: 1ffff1003b301d51 R09: 0000000000000004 [ 26.228787] R10: ffff8801d980ef18 R11: 0000000000000004 R12: 0000000000000093 [ 26.236029] R13: ffff8801d9a44340 R14: ffff8801db31d130 R15: ffff8801db31d130 [ 26.243274] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.251470] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 26.257319] CR2: 0000000000000000 CR3: 0000000006822002 CR4: 00000000001626e0 [ 26.264561] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.271805] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.279044] Call Trace: [ 26.281605] hardware_disable+0x34a/0x4b0 [ 26.285724] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 26.290191] kvm_arch_hardware_disable+0x35/0xd0 [ 26.294916] ? kvm_io_bus_get_dev+0x2a0/0x2a0 [ 26.299382] hardware_disable_nolock+0x30/0x40 [ 26.303940] on_each_cpu+0xca/0x1b0 [ 26.307542] hardware_disable_all_nolock+0x3e/0x50 [ 26.312440] kvm_put_kvm+0x956/0xdf0 [ 26.316125] ? kvm_clear_guest+0xb0/0xb0 [ 26.320159] ? kvm_irqfd_release+0xd1/0x120 [ 26.324451] ? lock_downgrade+0x980/0x980 [ 26.328577] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.333043] ? kvm_irqfd_release+0xdd/0x120 [ 26.337339] ? kvm_irqfd_release+0xdd/0x120 [ 26.341635] ? kvm_put_kvm+0xdf0/0xdf0 [ 26.345489] kvm_vm_release+0x42/0x50 [ 26.349260] __fput+0x327/0x7e0 [ 26.352512] ? fput+0x140/0x140 [ 26.355762] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 26.361623] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.366095] ____fput+0x15/0x20 [ 26.369345] task_work_run+0x199/0x270 [ 26.373203] ? task_work_cancel+0x210/0x210 [ 26.377493] ? _raw_spin_unlock+0x22/0x30 [ 26.381608] ? switch_task_namespaces+0x87/0xc0 [ 26.386246] do_exit+0x9bb/0x1ad0 [ 26.389671] ? find_held_lock+0x35/0x1d0 [ 26.393713] ? mm_update_next_owner+0x930/0x930 [ 26.398350] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 26.403505] ? lock_downgrade+0x980/0x980 [ 26.407624] ? __unqueue_futex+0x1c0/0x290 [ 26.411831] ? lock_release+0xa40/0xa40 [ 26.415787] ? fault_in_user_writeable+0x90/0x90 [ 26.420523] ? do_raw_spin_trylock+0x190/0x190 [ 26.425078] ? futex_wake+0x680/0x680 [ 26.428860] ? drop_futex_key_refs.isra.12+0x63/0xb0 [ 26.433941] ? futex_wait+0x6a9/0x9a0 [ 26.437722] ? check_noncircular+0x20/0x20 [ 26.441944] ? wake_up_q+0x8a/0xe0 [ 26.445462] ? drop_futex_key_refs.isra.12+0x63/0xb0 [ 26.450538] ? futex_wake+0x2ca/0x680 [ 26.454318] ? find_held_lock+0x35/0x1d0 [ 26.458363] ? get_signal+0x7ae/0x16c0 [ 26.462222] ? lock_downgrade+0x980/0x980 [ 26.466346] do_group_exit+0x149/0x400 [ 26.470202] ? do_raw_spin_trylock+0x190/0x190 [ 26.474751] ? SyS_exit+0x30/0x30 [ 26.478176] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.482639] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.487626] get_signal+0x73f/0x16c0 [ 26.491314] ? ptrace_notify+0x130/0x130 [ 26.495344] ? lock_release+0xa40/0xa40 [ 26.499292] ? __lock_is_held+0xb6/0x140 [ 26.503334] ? __fget+0x35c/0x570 [ 26.506773] do_signal+0x90/0x1eb0 [ 26.510295] ? iterate_fd+0x3f0/0x3f0 [ 26.514072] ? free_obj_work+0x690/0x690 [ 26.518109] ? setup_sigcontext+0x7d0/0x7d0 [ 26.522409] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 26.527312] ? selinux_file_ioctl+0x444/0x690 [ 26.531784] ? __fget_light+0x297/0x380 [ 26.535745] ? kvm_vcpu_compat_ioctl+0x1d6/0x450 [ 26.540478] ? kmem_cache_free+0x267/0x2a0 [ 26.544699] ? exit_to_usermode_loop+0x8c/0x310 [ 26.549348] exit_to_usermode_loop+0x214/0x310 [ 26.553912] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.559430] ? compat_SyS_ioctl+0x77/0x2a30 [ 26.563727] ? do_fast_syscall_32+0x156/0xf9d [ 26.568203] do_fast_syscall_32+0xbfd/0xf9d [ 26.572499] ? do_int80_syscall_32+0x9d0/0x9d0 [ 26.577064] ? syscall_return_slowpath+0x2ad/0x550 [ 26.581968] ? prepare_exit_to_usermode+0x340/0x340 [ 26.586958] ? sysret32_from_system_call+0x5/0x3b [ 26.591772] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.596588] entry_SYSENTER_compat+0x54/0x63 [ 26.600976] RIP: 0023:0xf7fb5c79 [ 26.604315] RSP: 002b:00000000f7f8c1ec EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 [ 26.611996] RAX: fffffffffffffe00 RBX: 00000000080faff4 RCX: 0000000000000000 [ 26.619243] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000080faff4 [ 26.626481] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 26.633719] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 26.640955] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 26.648200] 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 [ 26.667265] RIP: native_write_cr4+0x4/0x10 RSP: ffff8801d980efa8 [ 26.673383] ---[ end trace bd250fe6950a4415 ]--- [ 26.678107] Kernel panic - not syncing: Fatal exception [ 26.683855] Dumping ftrace buffer: [ 26.687366] (ftrace buffer empty) [ 26.691042] Kernel Offset: disabled [ 26.694636] Rebooting in 86400 seconds..