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 '10.128.0.57' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.175107] ================================================================== [ 31.182509] BUG: KMSAN: uninit-value in load_script+0x3ae/0xcd0 [ 31.188548] CPU: 1 PID: 3577 Comm: syzkaller456768 Not tainted 4.16.0+ #84 [ 31.195533] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.204866] Call Trace: [ 31.207436] dump_stack+0x185/0x1d0 [ 31.211052] ? load_script+0x3ae/0xcd0 [ 31.214916] kmsan_report+0x142/0x240 [ 31.218693] __msan_warning_32+0x6c/0xb0 [ 31.222741] ? search_binary_handler+0x210/0xac0 [ 31.227484] load_script+0x3ae/0xcd0 [ 31.231176] ? bm_evict_inode+0x1a0/0x1a0 [ 31.235301] search_binary_handler+0x2ef/0xac0 [ 31.239862] do_execveat_common+0x1f4d/0x2ce0 [ 31.244343] SYSC_execveat+0x149/0x170 [ 31.248208] SyS_execveat+0x76/0xa0 [ 31.251811] do_syscall_64+0x309/0x430 [ 31.255677] ? SYSC_execve+0x110/0x110 [ 31.259545] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.264717] RIP: 0033:0x445589 [ 31.267883] RSP: 002b:00007f35abff9da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 [ 31.275570] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445589 [ 31.282817] RDX: 0000000020000580 RSI: 0000000020ff7000 RDI: 0000000000000003 [ 31.290069] RBP: 0000000000000000 R08: 0000000000001000 R09: 0000000000000000 [ 31.297316] R10: 000000002034bff8 R11: 0000000000000246 R12: 00000000006dac20 [ 31.304562] R13: 726574696272615f R14: 6167762f7665642f R15: 0000000000000003 [ 31.311811] [ 31.313409] Uninit was stored to memory at: [ 31.317712] kmsan_internal_chain_origin+0x12b/0x210 [ 31.322788] kmsan_memcpy_origins+0x11d/0x170 [ 31.327256] __msan_memcpy+0x19f/0x1f0 [ 31.331122] _copy_to_iter+0xea2/0x28f0 [ 31.335070] copy_page_to_iter+0x383/0x1b70 [ 31.339371] shmem_file_read_iter+0x99f/0x1180 [ 31.343929] __vfs_read+0x6fb/0x8e0 [ 31.347532] vfs_read+0x36c/0x6c0 [ 31.350959] kernel_read+0x11f/0x1a0 [ 31.354649] prepare_binprm+0x982/0xad0 [ 31.358598] do_execveat_common+0x1b35/0x2ce0 [ 31.363075] SYSC_execveat+0x149/0x170 [ 31.366936] SyS_execveat+0x76/0xa0 [ 31.370536] do_syscall_64+0x309/0x430 [ 31.374398] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.379557] Uninit was created at: [ 31.383073] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 31.388066] kmsan_alloc_page+0x82/0xe0 [ 31.392024] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 31.396762] alloc_pages_vma+0xcc8/0x1800 [ 31.400887] shmem_alloc_and_acct_page+0x6d5/0x1000 [ 31.405891] shmem_getpage_gfp+0x35db/0x5770 [ 31.410279] shmem_file_read_iter+0x508/0x1180 [ 31.414848] __vfs_read+0x6fb/0x8e0 [ 31.418462] vfs_read+0x36c/0x6c0 [ 31.421894] kernel_read+0x11f/0x1a0 [ 31.425590] prepare_binprm+0x982/0xad0 [ 31.429539] do_execveat_common+0x1b35/0x2ce0 [ 31.434020] SYSC_execveat+0x149/0x170 [ 31.437892] SyS_execveat+0x76/0xa0 [ 31.441497] do_syscall_64+0x309/0x430 [ 31.445368] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.450527] ================================================================== [ 31.457865] Disabling lock debugging due to kernel taint [ 31.463289] Kernel panic - not syncing: panic_on_warn set ... [ 31.463289] [ 31.470628] CPU: 1 PID: 3577 Comm: syzkaller456768 Tainted: G B 4.16.0+ #84 [ 31.478924] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.488251] Call Trace: [ 31.490819] dump_stack+0x185/0x1d0 [ 31.494424] panic+0x39d/0x940 [ 31.497603] ? load_script+0x3ae/0xcd0 [ 31.501465] kmsan_report+0x238/0x240 [ 31.505252] __msan_warning_32+0x6c/0xb0 [ 31.509288] ? search_binary_handler+0x210/0xac0 [ 31.514024] load_script+0x3ae/0xcd0 [ 31.517721] ? bm_evict_inode+0x1a0/0x1a0 [ 31.521844] search_binary_handler+0x2ef/0xac0 [ 31.526404] do_execveat_common+0x1f4d/0x2ce0 [ 31.530888] SYSC_execveat+0x149/0x170 [ 31.534752] SyS_execveat+0x76/0xa0 [ 31.538355] do_syscall_64+0x309/0x430 [ 31.542227] ? SYSC_execve+0x110/0x110 [ 31.546092] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.551255] RIP: 0033:0x445589 [ 31.554419] RSP: 002b:00007f35abff9da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 [ 31.562103] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445589 [ 31.569346] RDX: 0000000020000580 RSI: 0000000020ff7000 RDI: 0000000000000003 [ 31.576591] RBP: 0000000000000000 R08: 0000000000001000 R09: 0000000000000000 [ 31.583843] R10: 000000002034bff8 R11: 0000000000000246 R12: 00000000006dac20 [ 31.591088] R13: 726574696272615f R14: 6167762f7665642f R15: 0000000000000003 [ 31.598929] Dumping ftrace buffer: [ 31.602447] (ftrace buffer empty) [ 31.606136] Kernel Offset: disabled [ 31.609737] Rebooting in 86400 seconds..