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 '10.128.0.33' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.788990] ================================================================== [ 42.796409] BUG: KMSAN: uninit-value in pointer+0x11e5/0x1410 [ 42.802290] CPU: 1 PID: 4515 Comm: syz-executor326 Not tainted 4.16.0+ #87 [ 42.809278] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.818609] Call Trace: [ 42.821187] dump_stack+0x185/0x1d0 [ 42.824813] ? pointer+0x11e5/0x1410 [ 42.828510] kmsan_report+0x142/0x240 [ 42.832297] __msan_warning_32+0x6c/0xb0 [ 42.836346] ? futex_wait_queue_me+0x401/0x710 [ 42.840928] pointer+0x11e5/0x1410 [ 42.844450] ? futex_wait_queue_me+0x476/0x710 [ 42.849011] vsnprintf+0xa2d/0x33c0 [ 42.852630] seq_printf+0x29f/0x420 [ 42.856260] ? futex_wait_queue_me+0x476/0x710 [ 42.860828] ? futex_wait_queue_me+0x476/0x710 [ 42.865397] ? futex_wait_queue_me+0x476/0x710 [ 42.869968] proc_pid_stack+0x326/0x470 [ 42.873936] proc_single_show+0x1af/0x300 [ 42.878074] ? proc_pid_wchan+0x250/0x250 [ 42.882212] ? proc_single_open+0x90/0x90 [ 42.886344] traverse+0x3c4/0xe60 [ 42.889789] ? __msan_poison_alloca+0x15c/0x1d0 [ 42.894445] seq_read+0x3dc/0x2260 [ 42.897973] ? security_file_permission+0x473/0x4b0 [ 42.902983] do_iter_read+0x880/0xd70 [ 42.906775] ? seq_open+0x360/0x360 [ 42.910390] do_preadv+0x3a1/0x580 [ 42.913928] ? prepare_exit_to_usermode+0x149/0x3a0 [ 42.918933] ? syscall_return_slowpath+0xe9/0x700 [ 42.923778] SYSC_preadv+0xc6/0xe0 [ 42.927309] SyS_preadv+0x77/0xa0 [ 42.930748] do_syscall_64+0x309/0x430 [ 42.934626] ? SYSC_writev+0xb0/0xb0 [ 42.938329] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 42.943502] RIP: 0033:0x445709 [ 42.946674] RSP: 002b:00007f20a81c1d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 [ 42.954371] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445709 [ 42.961622] RDX: 00000000000002d9 RSI: 0000000020000100 RDI: 0000000000000003 [ 42.968877] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 42.976136] R10: 0000000010400003 R11: 0000000000000246 R12: 00007f20a81c1d20 [ 42.983389] R13: 00000000006dac20 R14: 0000000000000000 R15: 0000000000000003 [ 42.990652] [ 42.992262] Uninit was stored to memory at: [ 42.996578] kmsan_internal_chain_origin+0x12b/0x210 [ 43.001667] __msan_chain_origin+0x69/0xc0 [ 43.005889] __save_stack_trace+0x829/0xb00 [ 43.010200] save_stack_trace_tsk+0x258/0x2f0 [ 43.014679] proc_pid_stack+0x26a/0x470 [ 43.018640] proc_single_show+0x1af/0x300 [ 43.022774] traverse+0x3c4/0xe60 [ 43.026211] seq_read+0x3dc/0x2260 [ 43.029739] do_iter_read+0x880/0xd70 [ 43.033523] do_preadv+0x3a1/0x580 [ 43.037049] SYSC_preadv+0xc6/0xe0 [ 43.040575] SyS_preadv+0x77/0xa0 [ 43.044015] do_syscall_64+0x309/0x430 [ 43.047890] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 43.053057] Uninit was stored to memory at: [ 43.057378] kmsan_internal_chain_origin+0x12b/0x210 [ 43.062471] __msan_chain_origin+0x69/0xc0 [ 43.066691] update_stack_state+0x959/0xa40 [ 43.070998] unwind_next_frame+0x618/0xe50 [ 43.075223] __save_stack_trace+0x734/0xb00 [ 43.079530] save_stack_trace_tsk+0x258/0x2f0 [ 43.084010] proc_pid_stack+0x26a/0x470 [ 43.087971] proc_single_show+0x1af/0x300 [ 43.092102] traverse+0x3c4/0xe60 [ 43.095538] seq_read+0x3dc/0x2260 [ 43.099065] do_iter_read+0x880/0xd70 [ 43.102848] do_preadv+0x3a1/0x580 [ 43.106376] SYSC_preadv+0xc6/0xe0 [ 43.109907] SyS_preadv+0x77/0xa0 [ 43.113342] do_syscall_64+0x309/0x430 [ 43.117214] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 43.122382] Local variable description: ----flags.i.i.i@rcu_all_qs [ 43.128679] Variable was created at: [ 43.132378] rcu_all_qs+0x32/0x1f0 [ 43.135905] _cond_resched+0x3c/0xd0 [ 43.139596] ================================================================== [ 43.146937] Disabling lock debugging due to kernel taint [ 43.152369] Kernel panic - not syncing: panic_on_warn set ... [ 43.152369] [ 43.159726] CPU: 1 PID: 4515 Comm: syz-executor326 Tainted: G B 4.16.0+ #87 [ 43.168024] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.177364] Call Trace: [ 43.179946] dump_stack+0x185/0x1d0 [ 43.183581] panic+0x39d/0x940 [ 43.186776] ? pointer+0x11e5/0x1410 [ 43.190478] kmsan_report+0x238/0x240 [ 43.194264] __msan_warning_32+0x6c/0xb0 [ 43.198319] ? futex_wait_queue_me+0x401/0x710 [ 43.202885] pointer+0x11e5/0x1410 [ 43.206432] ? futex_wait_queue_me+0x476/0x710 [ 43.211003] vsnprintf+0xa2d/0x33c0 [ 43.214622] seq_printf+0x29f/0x420 [ 43.218257] ? futex_wait_queue_me+0x476/0x710 [ 43.222827] ? futex_wait_queue_me+0x476/0x710 [ 43.227394] ? futex_wait_queue_me+0x476/0x710 [ 43.231971] proc_pid_stack+0x326/0x470 [ 43.235934] proc_single_show+0x1af/0x300 [ 43.240068] ? proc_pid_wchan+0x250/0x250 [ 43.244200] ? proc_single_open+0x90/0x90 [ 43.248333] traverse+0x3c4/0xe60 [ 43.251775] ? __msan_poison_alloca+0x15c/0x1d0 [ 43.256430] seq_read+0x3dc/0x2260 [ 43.259961] ? security_file_permission+0x473/0x4b0 [ 43.264971] do_iter_read+0x880/0xd70 [ 43.268763] ? seq_open+0x360/0x360 [ 43.272377] do_preadv+0x3a1/0x580 [ 43.275916] ? prepare_exit_to_usermode+0x149/0x3a0 [ 43.280924] ? syscall_return_slowpath+0xe9/0x700 [ 43.285757] SYSC_preadv+0xc6/0xe0 [ 43.289289] SyS_preadv+0x77/0xa0 [ 43.292729] do_syscall_64+0x309/0x430 [ 43.296608] ? SYSC_writev+0xb0/0xb0 [ 43.300309] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 43.305479] RIP: 0033:0x445709 [ 43.308652] RSP: 002b:00007f20a81c1d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 [ 43.316346] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445709 [ 43.323598] RDX: 00000000000002d9 RSI: 0000000020000100 RDI: 0000000000000003 [ 43.330851] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 43.338103] R10: 0000000010400003 R11: 0000000000000246 R12: 00007f20a81c1d20 [ 43.345356] R13: 00000000006dac20 R14: 0000000000000000 R15: 0000000000000003 [ 43.356239] Dumping ftrace buffer: [ 43.359760] (ftrace buffer empty) [ 43.363448] Kernel Offset: disabled [ 43.367055] Rebooting in 86400 seconds..