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 '10.128.0.24' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.232539] ================================================================== [ 59.239940] BUG: KMSAN: uninit-value in copy_page_to_iter+0x754/0x1b70 [ 59.246588] CPU: 1 PID: 4518 Comm: syzkaller996598 Not tainted 4.16.0+ #86 [ 59.253581] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.262910] Call Trace: [ 59.265479] dump_stack+0x185/0x1d0 [ 59.269083] ? kmsan_internal_check_memory+0x155/0x1e0 [ 59.274346] kmsan_report+0x142/0x240 [ 59.278137] kmsan_internal_check_memory+0x174/0x1e0 [ 59.283222] ? copy_page_to_iter+0x5f6/0x1b70 [ 59.287694] kmsan_copy_to_user+0x69/0x160 [ 59.291905] copy_page_to_iter+0x754/0x1b70 [ 59.296206] process_vm_rw_core+0xf6a/0x1930 [ 59.300865] ? process_vm_rw+0x356/0x500 [ 59.304917] process_vm_rw+0x3d5/0x500 [ 59.308793] SYSC_process_vm_readv+0x126/0x140 [ 59.313360] SyS_process_vm_readv+0x8a/0xb0 [ 59.317662] do_syscall_64+0x309/0x430 [ 59.321536] ? s_show+0xe80/0xe80 [ 59.324979] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 59.330145] RIP: 0033:0x445559 [ 59.333310] RSP: 002b:00007f50b98ebda8 EFLAGS: 00000216 ORIG_RAX: 0000000000000136 [ 59.340994] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445559 [ 59.348239] RDX: 0000000000000001 RSI: 0000000020001040 RDI: 00000000000011a5 [ 59.355483] RBP: 00000000006dac20 R08: 0000000000000005 R09: 0000000000000000 [ 59.362737] R10: 0000000020001480 R11: 0000000000000216 R12: 0000000000000000 [ 59.369983] R13: 00007fff56e1e76f R14: 00007f50b98ec9c0 R15: 0000000000000001 [ 59.377245] [ 59.378852] Uninit was created at: [ 59.382369] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 59.387361] kmsan_alloc_page+0x82/0xe0 [ 59.391318] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 59.396050] alloc_pages_vma+0x1565/0x1800 [ 59.400261] do_huge_pmd_anonymous_page+0xf80/0x2520 [ 59.405349] handle_mm_fault+0x428f/0x7e50 [ 59.409560] __do_page_fault+0xec4/0x1a10 [ 59.413680] do_page_fault+0xd3/0x260 [ 59.417454] page_fault+0x45/0x50 [ 59.420882] [ 59.422483] Bytes 0-4 of 5 are uninitialized [ 59.426861] ================================================================== [ 59.434190] Disabling lock debugging due to kernel taint [ 59.439614] Kernel panic - not syncing: panic_on_warn set ... [ 59.439614] [ 59.446950] CPU: 1 PID: 4518 Comm: syzkaller996598 Tainted: G B 4.16.0+ #86 [ 59.455672] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.464998] Call Trace: [ 59.467569] dump_stack+0x185/0x1d0 [ 59.471176] panic+0x39d/0x940 [ 59.474354] ? kmsan_internal_check_memory+0x155/0x1e0 [ 59.479605] kmsan_report+0x238/0x240 [ 59.483384] kmsan_internal_check_memory+0x174/0x1e0 [ 59.488470] ? copy_page_to_iter+0x5f6/0x1b70 [ 59.492950] kmsan_copy_to_user+0x69/0x160 [ 59.497160] copy_page_to_iter+0x754/0x1b70 [ 59.501460] process_vm_rw_core+0xf6a/0x1930 [ 59.505854] ? process_vm_rw+0x356/0x500 [ 59.509892] process_vm_rw+0x3d5/0x500 [ 59.513766] SYSC_process_vm_readv+0x126/0x140 [ 59.518341] SyS_process_vm_readv+0x8a/0xb0 [ 59.522637] do_syscall_64+0x309/0x430 [ 59.526499] ? s_show+0xe80/0xe80 [ 59.529930] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 59.535094] RIP: 0033:0x445559 [ 59.538269] RSP: 002b:00007f50b98ebda8 EFLAGS: 00000216 ORIG_RAX: 0000000000000136 [ 59.545964] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445559 [ 59.553219] RDX: 0000000000000001 RSI: 0000000020001040 RDI: 00000000000011a5 [ 59.560470] RBP: 00000000006dac20 R08: 0000000000000005 R09: 0000000000000000 [ 59.567713] R10: 0000000020001480 R11: 0000000000000216 R12: 0000000000000000 [ 59.574968] R13: 00007fff56e1e76f R14: 00007f50b98ec9c0 R15: 0000000000000001 [ 59.582637] Dumping ftrace buffer: [ 59.586151] (ftrace buffer empty) [ 59.589841] Kernel Offset: disabled [ 59.593447] Rebooting in 86400 seconds..