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 '10.128.0.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 43.799611] ================================================================== [ 43.807000] BUG: KMSAN: uninit-value in pointer+0x11e5/0x1410 [ 43.812876] CPU: 1 PID: 4481 Comm: syz-executor420 Not tainted 4.16.0+ #87 [ 43.819866] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.829200] Call Trace: [ 43.831770] dump_stack+0x185/0x1d0 [ 43.835378] ? pointer+0x11e5/0x1410 [ 43.839071] kmsan_report+0x142/0x240 [ 43.842853] __msan_warning_32+0x6c/0xb0 [ 43.846898] ? futex_wait_queue_me+0x401/0x710 [ 43.851545] pointer+0x11e5/0x1410 [ 43.855076] ? futex_wait_queue_me+0x476/0x710 [ 43.859637] vsnprintf+0xa2d/0x33c0 [ 43.863242] seq_printf+0x29f/0x420 [ 43.866891] ? save_stack_trace_tsk+0x26a/0x2f0 [ 43.871541] ? futex_wait_queue_me+0x476/0x710 [ 43.876103] ? futex_wait_queue_me+0x476/0x710 [ 43.880662] ? futex_wait_queue_me+0x476/0x710 [ 43.885221] proc_pid_stack+0x326/0x470 [ 43.889173] proc_single_show+0x1af/0x300 [ 43.893305] ? proc_pid_wchan+0x250/0x250 [ 43.897432] ? proc_single_open+0x90/0x90 [ 43.901559] seq_read+0xc7d/0x2260 [ 43.905087] do_iter_read+0x880/0xd70 [ 43.908866] ? seq_open+0x360/0x360 [ 43.912468] do_preadv+0x3a1/0x580 [ 43.915988] ? syscall_return_slowpath+0xe9/0x700 [ 43.920810] SYSC_preadv+0xc6/0xe0 [ 43.924330] SyS_preadv+0x77/0xa0 [ 43.927761] do_syscall_64+0x309/0x430 [ 43.931627] ? SYSC_writev+0xb0/0xb0 [ 43.935320] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 43.940486] RIP: 0033:0x445599 [ 43.943656] RSP: 002b:00007f07753c0d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 [ 43.951340] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445599 [ 43.958584] RDX: 0000000000000002 RSI: 0000000020000200 RDI: 0000000000000003 [ 43.965830] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 43.973075] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f07753c0d20 [ 43.980321] R13: 00000000006dac20 R14: 0000000000000000 R15: 0000000000000002 [ 43.987567] [ 43.989170] Uninit was stored to memory at: [ 43.993479] kmsan_internal_chain_origin+0x12b/0x210 [ 43.998559] __msan_chain_origin+0x69/0xc0 [ 44.002770] __save_stack_trace+0x829/0xb00 [ 44.007070] save_stack_trace_tsk+0x258/0x2f0 [ 44.011551] proc_pid_stack+0x26a/0x470 [ 44.015503] proc_single_show+0x1af/0x300 [ 44.019630] seq_read+0xc7d/0x2260 [ 44.023150] do_iter_read+0x880/0xd70 [ 44.026931] do_preadv+0x3a1/0x580 [ 44.030448] SYSC_preadv+0xc6/0xe0 [ 44.033963] SyS_preadv+0x77/0xa0 [ 44.037395] do_syscall_64+0x309/0x430 [ 44.041258] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.046417] Uninit was stored to memory at: [ 44.050716] kmsan_internal_chain_origin+0x12b/0x210 [ 44.055800] __msan_chain_origin+0x69/0xc0 [ 44.060033] update_stack_state+0x959/0xa40 [ 44.064340] unwind_next_frame+0x618/0xe50 [ 44.068552] __save_stack_trace+0x734/0xb00 [ 44.072852] save_stack_trace_tsk+0x258/0x2f0 [ 44.077326] proc_pid_stack+0x26a/0x470 [ 44.081277] proc_single_show+0x1af/0x300 [ 44.085397] seq_read+0xc7d/0x2260 [ 44.088913] do_iter_read+0x880/0xd70 [ 44.092689] do_preadv+0x3a1/0x580 [ 44.096209] SYSC_preadv+0xc6/0xe0 [ 44.099725] SyS_preadv+0x77/0xa0 [ 44.103153] do_syscall_64+0x309/0x430 [ 44.107030] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.112202] Local variable description: ----flags.i.i.i@rcu_all_qs [ 44.118501] Variable was created at: [ 44.122195] rcu_all_qs+0x32/0x1f0 [ 44.125710] _cond_resched+0x3c/0xd0 [ 44.129394] ================================================================== [ 44.136726] Disabling lock debugging due to kernel taint [ 44.142148] Kernel panic - not syncing: panic_on_warn set ... [ 44.142148] [ 44.149494] CPU: 1 PID: 4481 Comm: syz-executor420 Tainted: G B 4.16.0+ #87 [ 44.157783] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.167124] Call Trace: [ 44.169695] dump_stack+0x185/0x1d0 [ 44.173302] panic+0x39d/0x940 [ 44.176480] ? pointer+0x11e5/0x1410 [ 44.180176] kmsan_report+0x238/0x240 [ 44.183966] __msan_warning_32+0x6c/0xb0 [ 44.188012] ? futex_wait_queue_me+0x401/0x710 [ 44.192586] pointer+0x11e5/0x1410 [ 44.196111] ? futex_wait_queue_me+0x476/0x710 [ 44.200670] vsnprintf+0xa2d/0x33c0 [ 44.204277] seq_printf+0x29f/0x420 [ 44.207892] ? save_stack_trace_tsk+0x26a/0x2f0 [ 44.212541] ? futex_wait_queue_me+0x476/0x710 [ 44.217103] ? futex_wait_queue_me+0x476/0x710 [ 44.221667] ? futex_wait_queue_me+0x476/0x710 [ 44.226235] proc_pid_stack+0x326/0x470 [ 44.230198] proc_single_show+0x1af/0x300 [ 44.234327] ? proc_pid_wchan+0x250/0x250 [ 44.238463] ? proc_single_open+0x90/0x90 [ 44.242591] seq_read+0xc7d/0x2260 [ 44.246132] do_iter_read+0x880/0xd70 [ 44.249919] ? seq_open+0x360/0x360 [ 44.253526] do_preadv+0x3a1/0x580 [ 44.257065] ? syscall_return_slowpath+0xe9/0x700 [ 44.261899] SYSC_preadv+0xc6/0xe0 [ 44.265418] SyS_preadv+0x77/0xa0 [ 44.268865] do_syscall_64+0x309/0x430 [ 44.272732] ? SYSC_writev+0xb0/0xb0 [ 44.276424] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.281594] RIP: 0033:0x445599 [ 44.284760] RSP: 002b:00007f07753c0d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 [ 44.292445] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445599 [ 44.299696] RDX: 0000000000000002 RSI: 0000000020000200 RDI: 0000000000000003 [ 44.306943] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 44.314198] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f07753c0d20 [ 44.321449] R13: 00000000006dac20 R14: 0000000000000000 R15: 0000000000000002 [ 44.329169] Dumping ftrace buffer: [ 44.332696] (ftrace buffer empty) [ 44.336389] Kernel Offset: disabled [ 44.340005] Rebooting in 86400 seconds..