[....] Starting enhanced syslogd: rsyslogd[ 12.449197] audit: type=1400 audit(1516981184.277:5): avc: denied { syslog } for pid=3506 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: [ 19.126977] audit: type=1400 audit(1516981190.955:6): avc: denied { map } for pid=3645 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 '10.128.0.35' (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 executing program [ 37.351717] audit: type=1400 audit(1516981209.180:7): avc: denied { map } for pid=3662 comm="syzkaller286141" path="/root/syzkaller286141691" 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 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 [ 38.744123] kasan: CONFIG_KASAN_INLINE enabled [ 38.748821] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.756222] general protection fault: 0000 [#1] SMP KASAN [ 38.761732] Dumping ftrace buffer: [ 38.765240] (ftrace buffer empty) [ 38.768932] Modules linked in: [ 38.772107] CPU: 1 PID: 3950 Comm: syzkaller286141 Not tainted 4.15.0-rc9+ #281 [ 38.779522] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.788855] RIP: 0010:pppol2tp_connect+0x10a3/0x1dd0 [ 38.793943] RSP: 0018:ffff8801d1587af0 EFLAGS: 00010202 [ 38.799288] RAX: dffffc0000000000 RBX: ffff8801d0d33140 RCX: ffffffff8502c5f0 [ 38.806537] RDX: 0000000000000045 RSI: 000000004f52b9e1 RDI: 0000000000000228 [ 38.813780] RBP: ffff8801d1587d70 R08: 1ffff1003a2b0e9f R09: 0000000000000002 [ 38.821020] R10: ffff8801d15879c0 R11: 0000000000000000 R12: ffff8801d3d0d680 [ 38.828269] R13: ffff8801d1587d48 R14: 0000000000000000 R15: ffff8801d1587c28 [ 38.835511] FS: 0000000001b1b940(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 38.843706] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.849557] CR2: 00000000205fafd2 CR3: 00000001d1e3b001 CR4: 00000000001606e0 [ 38.856802] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.864052] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.871552] Call Trace: [ 38.874120] ? pppol2tp_recv_payload_hook+0x1b0/0x1b0 [ 38.879307] ? selinux_netlbl_socket_connect+0x76/0x1b0 [ 38.884670] ? selinux_socket_connect+0x311/0x730 [ 38.889495] ? lock_downgrade+0x980/0x980 [ 38.893613] ? lock_downgrade+0x980/0x980 [ 38.897732] ? selinux_socket_setsockopt+0x80/0x80 [ 38.902629] ? lock_release+0xa40/0xa40 [ 38.906586] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 38.912443] ? __check_object_size+0x25d/0x4f0 [ 38.916997] ? handle_mm_fault+0x410/0x8d0 [ 38.921205] ? __might_sleep+0x95/0x190 [ 38.925167] ? security_socket_connect+0x89/0xb0 [ 38.929897] SYSC_connect+0x213/0x4a0 [ 38.933668] ? SYSC_bind+0x410/0x410 [ 38.937368] ? do_page_fault+0xee/0x720 [ 38.941321] ? __do_page_fault+0xc90/0xc90 [ 38.945527] ? sock_map_fd+0x53/0x90 [ 38.949211] ? SyS_socket+0x12d/0x1d0 [ 38.952996] ? entry_SYSCALL_64_fastpath+0x5/0xa0 [ 38.957906] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.962905] SyS_connect+0x24/0x30 [ 38.966428] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 38.971162] RIP: 0033:0x442879 [ 38.974333] RSP: 002b:00007ffc51655b18 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 38.982013] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442879 [ 38.989264] RDX: 000000000000002e RSI: 00000000205fafd2 RDI: 0000000000000004 [ 38.996503] RBP: 0000000000009754 R08: 0000000000009754 R09: 0000000000009754 [ 39.003744] R10: 0000000000009754 R11: 0000000000000246 R12: 0000000000000000 [ 39.010983] R13: 000000000000011f R14: 0000000000000000 R15: 0000000000000000 [ 39.018242] Code: fe ff ff e8 80 65 6d 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 e5 09 00 00 4c 89 fa 48 b8 00 00 00 00 00 fc [ 39.037318] RIP: pppol2tp_connect+0x10a3/0x1dd0 RSP: ffff8801d1587af0 [ 39.043921] ---[ end trace f0f3c9469afcf391 ]--- [ 39.048665] Kernel panic - not syncing: Fatal exception [ 39.054346] Dumping ftrace buffer: [ 39.057853] (ftrace buffer empty) [ 39.061545] Kernel Offset: disabled [ 39.065153] Rebooting in 86400 seconds..