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 '10.128.10.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.604485] ================================================================== [ 42.611948] BUG: KMSAN: uninit-value in put_cmsg+0x600/0x870 [ 42.617729] CPU: 0 PID: 4459 Comm: syz-executor582 Not tainted 4.16.0+ #87 [ 42.624727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.634061] Call Trace: [ 42.636653] dump_stack+0x185/0x1d0 [ 42.640288] ? kmsan_internal_check_memory+0x116/0x1e0 [ 42.645553] kmsan_report+0x142/0x240 [ 42.649335] kmsan_internal_check_memory+0x135/0x1e0 [ 42.654420] kmsan_copy_to_user+0x69/0x160 [ 42.658653] put_cmsg+0x600/0x870 [ 42.662104] rds_recvmsg+0x2db5/0x3170 [ 42.665984] sock_recvmsg+0x1d0/0x230 [ 42.669767] ? rds_notify_queue_get+0x1020/0x1020 [ 42.674591] ___sys_recvmsg+0x3fb/0x810 [ 42.678639] ? __fget_light+0x56/0x710 [ 42.682505] ? __fdget+0x4e/0x60 [ 42.685854] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 42.691198] ? __fget_light+0x6b9/0x710 [ 42.695155] SYSC_recvmsg+0x298/0x3c0 [ 42.698939] SyS_recvmsg+0x54/0x80 [ 42.702463] do_syscall_64+0x309/0x430 [ 42.706339] ? ___sys_recvmsg+0x810/0x810 [ 42.710468] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 42.715634] RIP: 0033:0x445889 [ 42.718803] RSP: 002b:00007f7fd7e8fdb8 EFLAGS: 00000297 ORIG_RAX: 000000000000002f [ 42.726490] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445889 [ 42.733738] RDX: 0000000000000000 RSI: 0000000020000780 RDI: 0000000000000003 [ 42.740995] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 42.748248] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000 [ 42.755498] R13: 00007fff8847ca8f R14: 00007f7fd7e909c0 R15: 0000000000000006 [ 42.762748] [ 42.764355] Local variable description: ----__wq_entry@rds_recvmsg [ 42.770657] Variable was created at: [ 42.774355] rds_recvmsg+0x118/0x3170 [ 42.778143] sock_recvmsg+0x1d0/0x230 [ 42.781916] [ 42.783529] Bytes 4-7 of 32 are uninitialized [ 42.788011] ================================================================== [ 42.795796] Disabling lock debugging due to kernel taint [ 42.801223] Kernel panic - not syncing: panic_on_warn set ... [ 42.801223] [ 42.808572] CPU: 0 PID: 4459 Comm: syz-executor582 Tainted: G B 4.16.0+ #87 [ 42.816870] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.826202] Call Trace: [ 42.828779] dump_stack+0x185/0x1d0 [ 42.832395] panic+0x39d/0x940 [ 42.835587] ? kmsan_internal_check_memory+0x116/0x1e0 [ 42.840843] kmsan_report+0x238/0x240 [ 42.844625] kmsan_internal_check_memory+0x135/0x1e0 [ 42.849707] kmsan_copy_to_user+0x69/0x160 [ 42.853922] put_cmsg+0x600/0x870 [ 42.857360] rds_recvmsg+0x2db5/0x3170 [ 42.861242] sock_recvmsg+0x1d0/0x230 [ 42.865034] ? rds_notify_queue_get+0x1020/0x1020 [ 42.869868] ___sys_recvmsg+0x3fb/0x810 [ 42.873844] ? __fget_light+0x56/0x710 [ 42.877710] ? __fdget+0x4e/0x60 [ 42.881067] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 42.886417] ? __fget_light+0x6b9/0x710 [ 42.890387] SYSC_recvmsg+0x298/0x3c0 [ 42.894180] SyS_recvmsg+0x54/0x80 [ 42.897701] do_syscall_64+0x309/0x430 [ 42.901579] ? ___sys_recvmsg+0x810/0x810 [ 42.905709] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 42.910876] RIP: 0033:0x445889 [ 42.914051] RSP: 002b:00007f7fd7e8fdb8 EFLAGS: 00000297 ORIG_RAX: 000000000000002f [ 42.921766] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445889 [ 42.929028] RDX: 0000000000000000 RSI: 0000000020000780 RDI: 0000000000000003 [ 42.936287] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 42.943537] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000 [ 42.950786] R13: 00007fff8847ca8f R14: 00007f7fd7e909c0 R15: 0000000000000006 [ 42.958603] Dumping ftrace buffer: [ 42.962130] (ftrace buffer empty) [ 42.965817] Kernel Offset: disabled [ 42.969421] Rebooting in 86400 seconds..