[....] Starting enhanced syslogd: rsyslogd[ 16.149664] audit: type=1400 audit(1519645127.942:5): avc: denied { syslog } for pid=4075 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: [ 18.310882] audit: type=1400 audit(1519645130.103:6): avc: denied { map } for pid=4213 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 '10.128.15.193' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 24.899763] audit: type=1400 audit(1519645136.692:7): avc: denied { map } for pid=4227 comm="syzkaller075189" path="/root/syzkaller075189429" 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 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 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 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 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 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 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 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 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 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 executing program executing program [ 26.103118] kasan: CONFIG_KASAN_INLINE enabled [ 26.107815] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.115356] general protection fault: 0000 [#1] SMP KASAN [ 26.120880] Dumping ftrace buffer: [ 26.124392] (ftrace buffer empty) [ 26.128073] Modules linked in: [ 26.131238] CPU: 0 PID: 4411 Comm: syzkaller075189 Not tainted 4.16.0-rc2+ #329 [ 26.138653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.147986] RIP: 0010:pppol2tp_connect+0x10a3/0x1dd0 [ 26.153058] RSP: 0018:ffff8801b12679a8 EFLAGS: 00010202 [ 26.158397] RAX: dffffc0000000000 RBX: ffff8801b13ee580 RCX: ffffffff854ae0e0 [ 26.165641] RDX: 0000000000000045 RSI: 0000000024deec74 RDI: 0000000000000228 [ 26.172881] RBP: ffff8801b1267c28 R08: 1ffff1003624ce77 R09: 0000000000000002 [ 26.180121] R10: ffff8801b1267878 R11: 0000000000000000 R12: ffff8801b0cce480 [ 26.187364] R13: ffff8801b1267c00 R14: 0000000000000000 R15: ffff8801b1267ae0 [ 26.194607] FS: 00000000012cd880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.202803] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.208664] CR2: 0000000020348fd2 CR3: 00000001ae678005 CR4: 00000000001606f0 [ 26.215906] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.223148] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.230387] Call Trace: [ 26.232962] ? pppol2tp_recv_payload_hook+0x1b0/0x1b0 [ 26.238136] ? selinux_netlbl_socket_connect+0x76/0x1b0 [ 26.243472] ? selinux_socket_connect+0x311/0x730 [ 26.248286] ? lock_downgrade+0x980/0x980 [ 26.252407] ? selinux_socket_setsockopt+0x80/0x80 [ 26.257318] ? lock_release+0xa40/0xa40 [ 26.261269] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.267126] ? __check_object_size+0x8b/0x530 [ 26.271596] ? __might_sleep+0x95/0x190 [ 26.275546] ? security_socket_connect+0x89/0xb0 [ 26.280274] SYSC_connect+0x213/0x4a0 [ 26.284046] ? SYSC_bind+0x410/0x410 [ 26.287742] ? __handle_mm_fault+0x3b60/0x3b60 [ 26.292296] ? vmacache_find+0x5f/0x280 [ 26.296257] ? vmacache_update+0xfe/0x130 [ 26.300386] ? mm_fault_error+0x2c0/0x2c0 [ 26.304505] ? move_addr_to_kernel+0x60/0x60 [ 26.308884] ? SyS_accept+0x30/0x30 [ 26.312492] SyS_connect+0x24/0x30 [ 26.316009] do_syscall_64+0x280/0x940 [ 26.319873] ? __do_page_fault+0xc90/0xc90 [ 26.324078] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.328804] ? syscall_return_slowpath+0x550/0x550 [ 26.333705] ? syscall_return_slowpath+0x2ac/0x550 [ 26.338606] ? prepare_exit_to_usermode+0x350/0x350 [ 26.343591] ? retint_user+0x18/0x18 [ 26.347279] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.352095] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 26.357261] RIP: 0033:0x441449 [ 26.360432] RSP: 002b:00007ffde9361398 EFLAGS: 00000207 ORIG_RAX: 000000000000002a [ 26.368112] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441449 [ 26.375353] RDX: 000000000000002e RSI: 0000000020348fd2 RDI: 0000000000000004 [ 26.382602] RBP: 00000000000065ed R08: 0000000000000000 R09: 0000000000000000 [ 26.389843] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000000 [ 26.397083] R13: 00000000006cd428 R14: 0000000000000000 R15: 0000000000000000 [ 26.404329] Code: fe ff ff e8 c0 2b 26 fc 4c 89 fa 49 8d be 28 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 df 09 00 00 4c 89 fa 48 b8 00 00 00 00 00 fc [ 26.423398] RIP: pppol2tp_connect+0x10a3/0x1dd0 RSP: ffff8801b12679a8 [ 26.430038] ---[ end trace 4b113b7c2f2918b3 ]--- [ 26.434795] Kernel panic - not syncing: Fatal exception [ 26.440569] Dumping ftrace buffer: [ 26.444098] (ftrace buffer empty) [ 26.447778] Kernel Offset: disabled [ 26.451375] Rebooting in 86400 seconds..