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: [ 40.424246] ================================================================== [ 40.431649] BUG: KMSAN: uninit-value in pointer+0x11e5/0x1410 [ 40.437536] CPU: 0 PID: 4376 Comm: syz-executor632 Not tainted 4.16.0+ #87 [ 40.444550] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.454545] Call Trace: [ 40.457118] dump_stack+0x185/0x1d0 [ 40.460727] ? pointer+0x11e5/0x1410 [ 40.464419] kmsan_report+0x142/0x240 [ 40.468200] __msan_warning_32+0x6c/0xb0 [ 40.472245] ? do_preadv+0x331/0x580 [ 40.475943] pointer+0x11e5/0x1410 [ 40.479467] ? do_preadv+0x3a1/0x580 [ 40.483160] vsnprintf+0xa2d/0x33c0 [ 40.486768] seq_printf+0x29f/0x420 [ 40.490384] ? save_stack_trace_tsk+0x26a/0x2f0 [ 40.495031] ? do_preadv+0x3a1/0x580 [ 40.498726] ? do_preadv+0x3a1/0x580 [ 40.502419] ? do_preadv+0x3a1/0x580 [ 40.506198] proc_pid_stack+0x326/0x470 [ 40.510154] proc_single_show+0x1af/0x300 [ 40.514294] ? proc_pid_wchan+0x250/0x250 [ 40.518419] ? proc_single_open+0x90/0x90 [ 40.522543] seq_read+0xc7d/0x2260 [ 40.526083] do_iter_read+0x880/0xd70 [ 40.529915] ? seq_open+0x360/0x360 [ 40.533522] do_preadv+0x3a1/0x580 [ 40.537047] ? syscall_return_slowpath+0xe9/0x700 [ 40.541870] SYSC_preadv+0xc6/0xe0 [ 40.545392] SyS_preadv+0x77/0xa0 [ 40.548821] do_syscall_64+0x309/0x430 [ 40.552689] ? SYSC_writev+0xb0/0xb0 [ 40.556392] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 40.561559] RIP: 0033:0x4400a9 [ 40.564723] RSP: 002b:00007fff7f3ee7f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 40.572408] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400a9 [ 40.579655] RDX: 0000000000000001 RSI: 0000000020000180 RDI: 0000000000000003 [ 40.586916] RBP: 00000000006ca018 R08: 0000000000000010 R09: 65732f636f72702f [ 40.594164] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401930 [ 40.601413] R13: 00000000004019c0 R14: 0000000000000000 R15: 0000000000000000 [ 40.608663] [ 40.610265] Uninit was stored to memory at: [ 40.614570] kmsan_internal_chain_origin+0x12b/0x210 [ 40.619650] __msan_chain_origin+0x69/0xc0 [ 40.623864] __save_stack_trace+0x829/0xb00 [ 40.628161] save_stack_trace_tsk+0x258/0x2f0 [ 40.632633] proc_pid_stack+0x26a/0x470 [ 40.636583] proc_single_show+0x1af/0x300 [ 40.640706] seq_read+0xc7d/0x2260 [ 40.644222] do_iter_read+0x880/0xd70 [ 40.648009] do_preadv+0x3a1/0x580 [ 40.651535] SYSC_preadv+0xc6/0xe0 [ 40.655061] SyS_preadv+0x77/0xa0 [ 40.658506] do_syscall_64+0x309/0x430 [ 40.662380] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 40.667548] Uninit was stored to memory at: [ 40.671858] kmsan_internal_chain_origin+0x12b/0x210 [ 40.676943] __msan_chain_origin+0x69/0xc0 [ 40.681163] update_stack_state+0x959/0xa40 [ 40.685467] unwind_next_frame+0x618/0xe50 [ 40.689679] __save_stack_trace+0x734/0xb00 [ 40.693979] save_stack_trace_tsk+0x258/0x2f0 [ 40.698448] proc_pid_stack+0x26a/0x470 [ 40.702396] proc_single_show+0x1af/0x300 [ 40.706517] seq_read+0xc7d/0x2260 [ 40.710040] do_iter_read+0x880/0xd70 [ 40.713817] do_preadv+0x3a1/0x580 [ 40.717333] SYSC_preadv+0xc6/0xe0 [ 40.720853] SyS_preadv+0x77/0xa0 [ 40.724281] do_syscall_64+0x309/0x430 [ 40.728148] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 40.735315] Local variable description: ----nd@do_filp_open [ 40.740998] Variable was created at: [ 40.744699] do_filp_open+0x69/0x640 [ 40.748396] do_sys_open+0x624/0x960 [ 40.752258] ================================================================== [ 40.759594] Disabling lock debugging due to kernel taint [ 40.765029] Kernel panic - not syncing: panic_on_warn set ... [ 40.765029] [ 40.772380] CPU: 0 PID: 4376 Comm: syz-executor632 Tainted: G B 4.16.0+ #87 [ 40.780681] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.790105] Call Trace: [ 40.792680] dump_stack+0x185/0x1d0 [ 40.796292] panic+0x39d/0x940 [ 40.799474] ? pointer+0x11e5/0x1410 [ 40.803164] kmsan_report+0x238/0x240 [ 40.806945] __msan_warning_32+0x6c/0xb0 [ 40.810986] ? do_preadv+0x331/0x580 [ 40.814680] pointer+0x11e5/0x1410 [ 40.818199] ? do_preadv+0x3a1/0x580 [ 40.821892] vsnprintf+0xa2d/0x33c0 [ 40.825500] seq_printf+0x29f/0x420 [ 40.829121] ? save_stack_trace_tsk+0x26a/0x2f0 [ 40.833767] ? do_preadv+0x3a1/0x580 [ 40.837463] ? do_preadv+0x3a1/0x580 [ 40.841155] ? do_preadv+0x3a1/0x580 [ 40.844859] proc_pid_stack+0x326/0x470 [ 40.848814] proc_single_show+0x1af/0x300 [ 40.852943] ? proc_pid_wchan+0x250/0x250 [ 40.857071] ? proc_single_open+0x90/0x90 [ 40.861286] seq_read+0xc7d/0x2260 [ 40.864811] do_iter_read+0x880/0xd70 [ 40.868602] ? seq_open+0x360/0x360 [ 40.872206] do_preadv+0x3a1/0x580 [ 40.875730] ? syscall_return_slowpath+0xe9/0x700 [ 40.880561] SYSC_preadv+0xc6/0xe0 [ 40.884093] SyS_preadv+0x77/0xa0 [ 40.887525] do_syscall_64+0x309/0x430 [ 40.891390] ? SYSC_writev+0xb0/0xb0 [ 40.895092] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 40.900260] RIP: 0033:0x4400a9 [ 40.903425] RSP: 002b:00007fff7f3ee7f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 40.911111] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400a9 [ 40.918361] RDX: 0000000000000001 RSI: 0000000020000180 RDI: 0000000000000003 [ 40.925618] RBP: 00000000006ca018 R08: 0000000000000010 R09: 65732f636f72702f [ 40.932889] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401930 [ 40.940154] R13: 00000000004019c0 R14: 0000000000000000 R15: 0000000000000000 [ 40.947858] Dumping ftrace buffer: [ 40.951383] (ftrace buffer empty) [ 40.955069] Kernel Offset: disabled [ 40.958676] Rebooting in 86400 seconds..