INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.339474] ================================================================== [ 42.346860] BUG: KMSAN: uninit-value in pppol2tp_connect+0x258/0x1c50 [ 42.353415] CPU: 1 PID: 4524 Comm: syzkaller735385 Not tainted 4.16.0+ #85 [ 42.360399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.369730] Call Trace: [ 42.372296] dump_stack+0x185/0x1d0 [ 42.375900] ? pppol2tp_connect+0x258/0x1c50 [ 42.380297] kmsan_report+0x142/0x240 [ 42.384082] __msan_warning_32+0x6c/0xb0 [ 42.388122] pppol2tp_connect+0x258/0x1c50 [ 42.392336] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 42.397677] ? __fget_light+0x6b9/0x710 [ 42.401628] ? security_socket_connect+0x5d/0x210 [ 42.406445] ? security_socket_connect+0x9e/0x210 [ 42.411270] ? pppol2tp_release+0x660/0x660 [ 42.415569] SYSC_connect+0x41a/0x510 [ 42.419349] SyS_connect+0x54/0x80 [ 42.422865] do_syscall_64+0x309/0x430 [ 42.426731] ? SYSC_accept+0xb0/0xb0 [ 42.430421] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 42.435590] RIP: 0033:0x445559 [ 42.438756] RSP: 002b:00007f0b96f0ddb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 42.446442] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445559 [ 42.453695] RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 [ 42.460940] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 42.468188] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 42.475436] R13: 00007ffec2b0929f R14: 00007f0b96f0e9c0 R15: 0000000000000001 [ 42.482683] [ 42.484283] Local variable description: ----address@SYSC_connect [ 42.490394] Variable was created at: [ 42.494092] SYSC_connect+0x6f/0x510 [ 42.497790] SyS_connect+0x54/0x80 [ 42.501302] ================================================================== [ 42.508629] Disabling lock debugging due to kernel taint [ 42.514057] Kernel panic - not syncing: panic_on_warn set ... [ 42.514057] [ 42.521408] CPU: 1 PID: 4524 Comm: syzkaller735385 Tainted: G B 4.16.0+ #85 [ 42.529696] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.539023] Call Trace: [ 42.541590] dump_stack+0x185/0x1d0 [ 42.545195] panic+0x39d/0x940 [ 42.548375] ? pppol2tp_connect+0x258/0x1c50 [ 42.552768] kmsan_report+0x238/0x240 [ 42.556546] __msan_warning_32+0x6c/0xb0 [ 42.560592] pppol2tp_connect+0x258/0x1c50 [ 42.564806] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 42.570146] ? __fget_light+0x6b9/0x710 [ 42.574110] ? security_socket_connect+0x5d/0x210 [ 42.578939] ? security_socket_connect+0x9e/0x210 [ 42.583763] ? pppol2tp_release+0x660/0x660 [ 42.588070] SYSC_connect+0x41a/0x510 [ 42.591853] SyS_connect+0x54/0x80 [ 42.595373] do_syscall_64+0x309/0x430 [ 42.599238] ? SYSC_accept+0xb0/0xb0 [ 42.602930] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 42.608106] RIP: 0033:0x445559 [ 42.611273] RSP: 002b:00007f0b96f0ddb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 42.618972] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445559 [ 42.626217] RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 [ 42.633461] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 42.640705] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 42.647950] R13: 00007ffec2b0929f R14: 00007f0b96f0e9c0 R15: 0000000000000001 [ 42.655625] Dumping ftrace buffer: [ 42.659142] (ftrace buffer empty) [ 42.662823] Kernel Offset: disabled [ 42.666423] Rebooting in 86400 seconds..