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 '10.128.10.16' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 43.914094] ================================================================== [ 43.921492] BUG: KMSAN: uninit-value in pointer+0x11e5/0x1410 [ 43.927878] CPU: 0 PID: 4484 Comm: syz-executor836 Not tainted 4.16.0+ #87 [ 43.934865] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.944195] Call Trace: [ 43.946764] dump_stack+0x185/0x1d0 [ 43.950372] ? pointer+0x11e5/0x1410 [ 43.954077] kmsan_report+0x142/0x240 [ 43.957865] __msan_warning_32+0x6c/0xb0 [ 43.961913] ? seq_read+0xbd1/0x2260 [ 43.965604] pointer+0x11e5/0x1410 [ 43.969123] ? seq_read+0xc7d/0x2260 [ 43.972814] vsnprintf+0xa2d/0x33c0 [ 43.976422] seq_printf+0x29f/0x420 [ 43.980038] ? save_stack_trace_tsk+0x26a/0x2f0 [ 43.984683] ? seq_read+0xc7d/0x2260 [ 43.988378] ? seq_read+0xc7d/0x2260 [ 43.992068] ? seq_read+0xc7d/0x2260 [ 43.995762] proc_pid_stack+0x326/0x470 [ 43.999717] proc_single_show+0x1af/0x300 [ 44.003845] ? proc_pid_wchan+0x250/0x250 [ 44.007972] ? proc_single_open+0x90/0x90 [ 44.012094] seq_read+0xc7d/0x2260 [ 44.015618] do_iter_read+0x880/0xd70 [ 44.019408] ? seq_open+0x360/0x360 [ 44.023013] do_preadv+0x3a1/0x580 [ 44.026535] ? prepare_exit_to_usermode+0x149/0x3a0 [ 44.031530] ? syscall_return_slowpath+0xe9/0x700 [ 44.036358] SYSC_preadv+0xc6/0xe0 [ 44.040138] SyS_preadv+0x77/0xa0 [ 44.043572] do_syscall_64+0x309/0x430 [ 44.047453] ? SYSC_writev+0xb0/0xb0 [ 44.051159] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.056325] RIP: 0033:0x4400a9 [ 44.059491] RSP: 002b:00007ffd9655a5d8 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 44.067177] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400a9 [ 44.074423] RDX: 1000000000000178 RSI: 0000000020000380 RDI: 0000000000000003 [ 44.081671] RBP: 00000000006ca018 R08: 0000000000000010 R09: 65732f636f72702f [ 44.088918] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401930 [ 44.096165] R13: 00000000004019c0 R14: 0000000000000000 R15: 0000000000000000 [ 44.103414] [ 44.105016] Uninit was stored to memory at: [ 44.109318] kmsan_internal_chain_origin+0x12b/0x210 [ 44.114408] __msan_chain_origin+0x69/0xc0 [ 44.118621] __save_stack_trace+0x829/0xb00 [ 44.122926] save_stack_trace_tsk+0x258/0x2f0 [ 44.127412] proc_pid_stack+0x26a/0x470 [ 44.131375] proc_single_show+0x1af/0x300 [ 44.135498] seq_read+0xc7d/0x2260 [ 44.139015] do_iter_read+0x880/0xd70 [ 44.142791] do_preadv+0x3a1/0x580 [ 44.146312] SYSC_preadv+0xc6/0xe0 [ 44.149829] SyS_preadv+0x77/0xa0 [ 44.153258] do_syscall_64+0x309/0x430 [ 44.157125] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.162287] Uninit was stored to memory at: [ 44.166588] kmsan_internal_chain_origin+0x12b/0x210 [ 44.171667] __msan_chain_origin+0x69/0xc0 [ 44.175880] update_stack_state+0x959/0xa40 [ 44.180180] unwind_next_frame+0x618/0xe50 [ 44.184393] __save_stack_trace+0x734/0xb00 [ 44.188693] save_stack_trace_tsk+0x258/0x2f0 [ 44.193167] proc_pid_stack+0x26a/0x470 [ 44.197118] proc_single_show+0x1af/0x300 [ 44.201243] seq_read+0xc7d/0x2260 [ 44.204780] do_iter_read+0x880/0xd70 [ 44.208559] do_preadv+0x3a1/0x580 [ 44.212079] SYSC_preadv+0xc6/0xe0 [ 44.215597] SyS_preadv+0x77/0xa0 [ 44.219027] do_syscall_64+0x309/0x430 [ 44.222892] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.228054] Local variable description: ----flags.i.i.i@rcu_all_qs [ 44.234343] Variable was created at: [ 44.238048] rcu_all_qs+0x32/0x1f0 [ 44.241574] _cond_resched+0x3c/0xd0 [ 44.245260] ================================================================== [ 44.252593] Disabling lock debugging due to kernel taint [ 44.258021] Kernel panic - not syncing: panic_on_warn set ... [ 44.258021] [ 44.265378] CPU: 0 PID: 4484 Comm: syz-executor836 Tainted: G B 4.16.0+ #87 [ 44.273668] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.282999] Call Trace: [ 44.285573] dump_stack+0x185/0x1d0 [ 44.289180] panic+0x39d/0x940 [ 44.292364] ? pointer+0x11e5/0x1410 [ 44.296059] kmsan_report+0x238/0x240 [ 44.299850] __msan_warning_32+0x6c/0xb0 [ 44.303889] ? seq_read+0xbd1/0x2260 [ 44.307579] pointer+0x11e5/0x1410 [ 44.311097] ? seq_read+0xc7d/0x2260 [ 44.314791] vsnprintf+0xa2d/0x33c0 [ 44.318410] seq_printf+0x29f/0x420 [ 44.322043] ? save_stack_trace_tsk+0x26a/0x2f0 [ 44.326699] ? seq_read+0xc7d/0x2260 [ 44.330391] ? seq_read+0xc7d/0x2260 [ 44.334090] ? seq_read+0xc7d/0x2260 [ 44.337890] proc_pid_stack+0x326/0x470 [ 44.341844] proc_single_show+0x1af/0x300 [ 44.345972] ? proc_pid_wchan+0x250/0x250 [ 44.350116] ? proc_single_open+0x90/0x90 [ 44.354252] seq_read+0xc7d/0x2260 [ 44.357777] do_iter_read+0x880/0xd70 [ 44.361557] ? seq_open+0x360/0x360 [ 44.365162] do_preadv+0x3a1/0x580 [ 44.368685] ? prepare_exit_to_usermode+0x149/0x3a0 [ 44.373680] ? syscall_return_slowpath+0xe9/0x700 [ 44.378505] SYSC_preadv+0xc6/0xe0 [ 44.382035] SyS_preadv+0x77/0xa0 [ 44.385494] do_syscall_64+0x309/0x430 [ 44.389366] ? SYSC_writev+0xb0/0xb0 [ 44.393062] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.398230] RIP: 0033:0x4400a9 [ 44.401406] RSP: 002b:00007ffd9655a5d8 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 44.409091] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400a9 [ 44.416339] RDX: 1000000000000178 RSI: 0000000020000380 RDI: 0000000000000003 [ 44.423591] RBP: 00000000006ca018 R08: 0000000000000010 R09: 65732f636f72702f [ 44.430839] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401930 [ 44.438092] R13: 00000000004019c0 R14: 0000000000000000 R15: 0000000000000000 [ 44.445830] Dumping ftrace buffer: [ 44.449359] (ftrace buffer empty) [ 44.453044] Kernel Offset: disabled [ 44.456649] Rebooting in 86400 seconds..