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 '10.128.10.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.177234] ================================================================== [ 44.184653] BUG: KMSAN: uninit-value in kallsyms_lookup+0x152/0x910 [ 44.191041] CPU: 0 PID: 4505 Comm: syz-executor288 Not tainted 4.16.0+ #87 [ 44.198031] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.207368] Call Trace: [ 44.209951] dump_stack+0x185/0x1d0 [ 44.213568] ? kallsyms_lookup+0x152/0x910 [ 44.217786] kmsan_report+0x142/0x240 [ 44.221571] ? SYSC_futex+0x3e0/0x810 [ 44.225374] __msan_warning_32+0x6c/0xb0 [ 44.229415] ? SYSC_futex+0x3e0/0x810 [ 44.233207] kallsyms_lookup+0x152/0x910 [ 44.237249] ? __msan_poison_alloca+0x15c/0x1d0 [ 44.241903] ? SYSC_futex+0x3e1/0x810 [ 44.245683] __sprint_symbol+0x147/0x5b0 [ 44.249732] ? kmsan_set_origin_inline+0x6b/0x120 [ 44.254555] ? SYSC_futex+0x3e1/0x810 [ 44.258337] sprint_backtrace+0x7f/0x90 [ 44.262292] ? SYSC_futex+0x3e1/0x810 [ 44.266073] symbol_string+0x19f/0x230 [ 44.269939] ? SYSC_futex+0x3e1/0x810 [ 44.273725] ? kmsan_set_origin_inline+0x6b/0x120 [ 44.278548] ? __msan_poison_alloca+0x15c/0x1d0 [ 44.283204] ? vsnprintf+0xa2d/0x33c0 [ 44.286982] ? pointer+0xa8/0x1410 [ 44.290499] ? vsnprintf+0xa2d/0x33c0 [ 44.294282] ? SYSC_futex+0x3e1/0x810 [ 44.298063] pointer+0xdb9/0x1410 [ 44.301498] ? SYSC_futex+0x3e1/0x810 [ 44.305293] vsnprintf+0xa2d/0x33c0 [ 44.308904] seq_printf+0x29f/0x420 [ 44.312522] ? save_stack_trace_tsk+0x26a/0x2f0 [ 44.317173] ? SYSC_futex+0x3e1/0x810 [ 44.320954] ? SYSC_futex+0x3e1/0x810 [ 44.324737] ? SYSC_futex+0x3e1/0x810 [ 44.328520] proc_pid_stack+0x326/0x470 [ 44.332475] proc_single_show+0x1af/0x300 [ 44.336612] ? proc_pid_wchan+0x250/0x250 [ 44.340742] ? proc_single_open+0x90/0x90 [ 44.344876] seq_read+0xc7d/0x2260 [ 44.348402] do_iter_read+0x880/0xd70 [ 44.352187] ? seq_open+0x360/0x360 [ 44.355794] do_readv+0x295/0x5f0 [ 44.359240] ? syscall_return_slowpath+0xe9/0x700 [ 44.364078] SYSC_readv+0x9b/0xb0 [ 44.367525] SyS_readv+0x56/0x80 [ 44.370871] do_syscall_64+0x309/0x430 [ 44.374738] ? vfs_readv+0x260/0x260 [ 44.378432] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.383609] RIP: 0033:0x445589 [ 44.386787] RSP: 002b:00007fc1941dfd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 [ 44.394477] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445589 [ 44.401725] RDX: 0000000000000001 RSI: 00000000200012c0 RDI: 0000000000000003 [ 44.408978] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 44.416233] R10: 65732f636f72702f R11: 0000000000000246 R12: 00007fc1941dfd20 [ 44.423483] R13: 00000000006dac20 R14: 0000000000000000 R15: 0000000000000002 [ 44.430738] [ 44.432342] Uninit was stored to memory at: [ 44.436647] kmsan_internal_chain_origin+0x12b/0x210 [ 44.441735] __msan_chain_origin+0x69/0xc0 [ 44.445949] __save_stack_trace+0x829/0xb00 [ 44.450253] save_stack_trace_tsk+0x258/0x2f0 [ 44.454742] proc_pid_stack+0x26a/0x470 [ 44.458693] proc_single_show+0x1af/0x300 [ 44.462817] seq_read+0xc7d/0x2260 [ 44.466337] do_iter_read+0x880/0xd70 [ 44.470116] do_readv+0x295/0x5f0 [ 44.473549] SYSC_readv+0x9b/0xb0 [ 44.476979] SyS_readv+0x56/0x80 [ 44.480323] do_syscall_64+0x309/0x430 [ 44.484193] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.489355] Uninit was stored to memory at: [ 44.493659] kmsan_internal_chain_origin+0x12b/0x210 [ 44.498742] __msan_chain_origin+0x69/0xc0 [ 44.502960] update_stack_state+0x959/0xa40 [ 44.507277] unwind_next_frame+0x618/0xe50 [ 44.511498] __save_stack_trace+0x734/0xb00 [ 44.515810] save_stack_trace_tsk+0x258/0x2f0 [ 44.520289] proc_pid_stack+0x26a/0x470 [ 44.524241] proc_single_show+0x1af/0x300 [ 44.528364] seq_read+0xc7d/0x2260 [ 44.532551] do_iter_read+0x880/0xd70 [ 44.536329] do_readv+0x295/0x5f0 [ 44.539758] SYSC_readv+0x9b/0xb0 [ 44.543186] SyS_readv+0x56/0x80 [ 44.546538] do_syscall_64+0x309/0x430 [ 44.550412] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.555582] Local variable description: ----ewq@userfaultfd_unmap_complete [ 44.562573] Variable was created at: [ 44.566291] userfaultfd_unmap_complete+0x49/0x4e0 [ 44.571199] SYSC_munmap+0x1c5/0x1f0 [ 44.574893] ================================================================== [ 44.582230] Disabling lock debugging due to kernel taint [ 44.587656] Kernel panic - not syncing: panic_on_warn set ... [ 44.587656] [ 44.595002] CPU: 0 PID: 4505 Comm: syz-executor288 Tainted: G B 4.16.0+ #87 [ 44.603302] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.612636] Call Trace: [ 44.615207] dump_stack+0x185/0x1d0 [ 44.618816] panic+0x39d/0x940 [ 44.622000] ? kallsyms_lookup+0x152/0x910 [ 44.626232] kmsan_report+0x238/0x240 [ 44.630018] ? SYSC_futex+0x3e0/0x810 [ 44.633815] __msan_warning_32+0x6c/0xb0 [ 44.637867] ? SYSC_futex+0x3e0/0x810 [ 44.641646] kallsyms_lookup+0x152/0x910 [ 44.645693] ? __msan_poison_alloca+0x15c/0x1d0 [ 44.650343] ? SYSC_futex+0x3e1/0x810 [ 44.654137] __sprint_symbol+0x147/0x5b0 [ 44.658177] ? kmsan_set_origin_inline+0x6b/0x120 [ 44.663000] ? SYSC_futex+0x3e1/0x810 [ 44.666789] sprint_backtrace+0x7f/0x90 [ 44.670752] ? SYSC_futex+0x3e1/0x810 [ 44.674540] symbol_string+0x19f/0x230 [ 44.678499] ? SYSC_futex+0x3e1/0x810 [ 44.682285] ? kmsan_set_origin_inline+0x6b/0x120 [ 44.687112] ? __msan_poison_alloca+0x15c/0x1d0 [ 44.691757] ? vsnprintf+0xa2d/0x33c0 [ 44.695536] ? pointer+0xa8/0x1410 [ 44.699058] ? vsnprintf+0xa2d/0x33c0 [ 44.702842] ? SYSC_futex+0x3e1/0x810 [ 44.706623] pointer+0xdb9/0x1410 [ 44.710060] ? SYSC_futex+0x3e1/0x810 [ 44.713841] vsnprintf+0xa2d/0x33c0 [ 44.717454] seq_printf+0x29f/0x420 [ 44.721080] ? save_stack_trace_tsk+0x26a/0x2f0 [ 44.725729] ? SYSC_futex+0x3e1/0x810 [ 44.729513] ? SYSC_futex+0x3e1/0x810 [ 44.733293] ? SYSC_futex+0x3e1/0x810 [ 44.737081] proc_pid_stack+0x326/0x470 [ 44.741050] proc_single_show+0x1af/0x300 [ 44.745188] ? proc_pid_wchan+0x250/0x250 [ 44.749316] ? proc_single_open+0x90/0x90 [ 44.753443] seq_read+0xc7d/0x2260 [ 44.756978] do_iter_read+0x880/0xd70 [ 44.760759] ? seq_open+0x360/0x360 [ 44.764364] do_readv+0x295/0x5f0 [ 44.767808] ? syscall_return_slowpath+0xe9/0x700 [ 44.772636] SYSC_readv+0x9b/0xb0 [ 44.776086] SyS_readv+0x56/0x80 [ 44.779440] do_syscall_64+0x309/0x430 [ 44.783316] ? vfs_readv+0x260/0x260 [ 44.787018] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.792208] RIP: 0033:0x445589 [ 44.795375] RSP: 002b:00007fc1941dfd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 [ 44.803063] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445589 [ 44.810316] RDX: 0000000000000001 RSI: 00000000200012c0 RDI: 0000000000000003 [ 44.817565] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 44.824814] R10: 65732f636f72702f R11: 0000000000000246 R12: 00007fc1941dfd20 [ 44.832067] R13: 00000000006dac20 R14: 0000000000000000 R15: 0000000000000002 [ 44.839779] Dumping ftrace buffer: [ 44.843313] (ftrace buffer empty) [ 44.847002] Kernel Offset: disabled [ 44.850608] Rebooting in 86400 seconds..