[....] Starting enhanced syslogd: rsyslogd[ 18.661344] audit: type=1400 audit(1518169523.656:5): avc: denied { syslog } for pid=4072 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: [ 23.167726] audit: type=1400 audit(1518169528.162:6): avc: denied { map } for pid=4212 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 '10.128.15.207' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program [ 45.911100] audit: type=1400 audit(1518169550.905:7): avc: denied { map } for pid=4228 comm="syzkaller530359" path="/root/syzkaller530359573" 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 [ 46.338165] kasan: CONFIG_KASAN_INLINE enabled [ 46.342924] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 46.350601] general protection fault: 0000 [#1] SMP KASAN [ 46.356126] Dumping ftrace buffer: [ 46.359656] (ftrace buffer empty) [ 46.363341] Modules linked in: [ 46.366525] CPU: 0 PID: 4285 Comm: syzkaller530359 Not tainted 4.15.0+ #215 [ 46.373600] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.382944] RIP: 0010:pppol2tp_connect+0x10a3/0x1dd0 [ 46.388016] RSP: 0018:ffff8801afe27958 EFLAGS: 00010202 [ 46.393355] RAX: dffffc0000000000 RBX: ffff8801afdaeb40 RCX: ffffffff851ac3a0 [ 46.402784] RDX: 0000000000000045 RSI: 00000000154c0643 RDI: 0000000000000228 [ 46.410028] RBP: ffff8801afe27bd8 R08: 1ffff10035fc4e6d R09: 0000000000000002 [ 46.417274] R10: ffff8801afe27828 R11: 0000000000000000 R12: ffff8801afcf6040 [ 46.424518] R13: ffff8801afe27bb0 R14: 0000000000000000 R15: ffff8801afe27a90 [ 46.431778] FS: 0000000000000000(0000) GS:ffff8801db400000(0063) knlGS:0000000009a8e840 [ 46.439978] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 46.445833] CR2: 000000002014cfd2 CR3: 00000001ae20b002 CR4: 00000000001606f0 [ 46.453083] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.460420] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.467840] Call Trace: [ 46.470420] ? pppol2tp_recv_payload_hook+0x1b0/0x1b0 [ 46.475590] ? selinux_netlbl_socket_connect+0x76/0x1b0 [ 46.480948] ? selinux_socket_connect+0x311/0x730 [ 46.485780] ? lock_downgrade+0x980/0x980 [ 46.489918] ? selinux_socket_setsockopt+0x80/0x80 [ 46.494825] ? lock_release+0xa40/0xa40 [ 46.498778] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 46.504659] ? __check_object_size+0x8b/0x530 [ 46.509139] ? __might_sleep+0x95/0x190 [ 46.513116] ? security_socket_connect+0x89/0xb0 [ 46.517861] SYSC_connect+0x213/0x4a0 [ 46.521640] ? SYSC_bind+0x410/0x410 [ 46.525348] ? handle_mm_fault+0x43b/0x970 [ 46.529561] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 46.534116] ? vmacache_find+0x5f/0x280 [ 46.538071] ? up_read+0x1a/0x40 [ 46.541418] ? __do_page_fault+0x3d6/0xc90 [ 46.545644] SyS_connect+0x24/0x30 [ 46.549157] ? SyS_accept+0x30/0x30 [ 46.552772] do_fast_syscall_32+0x3ee/0xfa1 [ 46.557071] ? do_int80_syscall_32+0x9d0/0x9d0 [ 46.561628] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 46.566360] ? syscall_return_slowpath+0x2ac/0x550 [ 46.571266] ? prepare_exit_to_usermode+0x350/0x350 [ 46.576283] ? retint_user+0x18/0x18 [ 46.579976] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 46.584798] entry_SYSENTER_compat+0x54/0x63 [ 46.589182] RIP: 0023:0xf7f73c79 [ 46.592521] RSP: 002b:00000000fffe240c EFLAGS: 00000282 ORIG_RAX: 000000000000016a [ 46.600206] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000002014cfd2 [ 46.607456] RDX: 000000000000002e RSI: 00000000080d6e00 RDI: 00000000080eff04 [ 46.614701] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 46.621960] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 46.629294] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 46.636549] Code: fe ff ff e8 d0 e6 55 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 [ 46.655638] RIP: pppol2tp_connect+0x10a3/0x1dd0 RSP: ffff8801afe27958 [ 46.662285] ---[ end trace 23e3b12300ab844b ]--- [ 46.667039] Kernel panic - not syncing: Fatal exception [ 46.672882] Dumping ftrace buffer: [ 46.676412] (ftrace buffer empty) [ 46.680103] Kernel Offset: disabled [ 46.683709] Rebooting in 86400 seconds..