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 '10.128.0.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 30.507701] ================================================================== [ 30.515084] BUG: KMSAN: uninit-value in copy_page_to_iter+0x754/0x1b70 [ 30.521723] CPU: 1 PID: 3561 Comm: syzkaller253593 Not tainted 4.16.0+ #82 [ 30.528707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.538122] Call Trace: [ 30.540705] dump_stack+0x185/0x1d0 [ 30.544309] ? kmsan_internal_check_memory+0x145/0x1d0 [ 30.549563] kmsan_report+0x142/0x240 [ 30.553341] kmsan_internal_check_memory+0x164/0x1d0 [ 30.558426] ? copy_page_to_iter+0x5f6/0x1b70 [ 30.562900] kmsan_copy_to_user+0x69/0x160 [ 30.567110] copy_page_to_iter+0x754/0x1b70 [ 30.571414] process_vm_rw_core+0xf6a/0x1930 [ 30.575808] ? process_vm_rw+0x356/0x500 [ 30.579843] process_vm_rw+0x3d5/0x500 [ 30.583706] ? kmsan_set_origin_inline+0x6b/0x120 [ 30.588528] SYSC_process_vm_readv+0x126/0x140 [ 30.593136] SyS_process_vm_readv+0x8a/0xb0 [ 30.597534] do_syscall_64+0x309/0x430 [ 30.601414] ? s_show+0xe80/0xe80 [ 30.604856] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 30.610024] RIP: 0033:0x43fe59 [ 30.613196] RSP: 002b:00007ffc712d3ac8 EFLAGS: 00000216 ORIG_RAX: 0000000000000136 [ 30.620879] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe59 [ 30.628123] RDX: 0000000000000009 RSI: 0000000020000a00 RDI: 0000000000000de9 [ 30.635372] RBP: 00000000006ca018 R08: 0000000000000009 R09: 0000000000000000 [ 30.642627] R10: 0000000020001100 R11: 0000000000000216 R12: 0000000000401780 [ 30.649877] R13: 0000000000401810 R14: 0000000000000000 R15: 0000000000000000 [ 30.657124] [ 30.658724] Uninit was created at: [ 30.662656] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 30.667648] kmsan_alloc_page+0x82/0xe0 [ 30.671631] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 30.676368] alloc_pages_vma+0x1565/0x1800 [ 30.680593] do_huge_pmd_anonymous_page+0xf80/0x2520 [ 30.685677] handle_mm_fault+0x30ba/0x7ba0 [ 30.689886] __do_page_fault+0xec4/0x1a10 [ 30.694014] do_page_fault+0xd3/0x260 [ 30.697801] page_fault+0x45/0x50 [ 30.701224] [ 30.702826] Bytes 0-157 of 158 are uninitialized [ 30.707549] ================================================================== [ 30.714877] Disabling lock debugging due to kernel taint [ 30.720300] Kernel panic - not syncing: panic_on_warn set ... [ 30.720300] [ 30.727648] CPU: 1 PID: 3561 Comm: syzkaller253593 Tainted: G B 4.16.0+ #82 [ 30.735932] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.745260] Call Trace: [ 30.747830] dump_stack+0x185/0x1d0 [ 30.751446] panic+0x39d/0x940 [ 30.754636] ? kmsan_internal_check_memory+0x145/0x1d0 [ 30.759892] kmsan_report+0x238/0x240 [ 30.763676] kmsan_internal_check_memory+0x164/0x1d0 [ 30.768759] ? copy_page_to_iter+0x5f6/0x1b70 [ 30.773231] kmsan_copy_to_user+0x69/0x160 [ 30.777442] copy_page_to_iter+0x754/0x1b70 [ 30.781831] process_vm_rw_core+0xf6a/0x1930 [ 30.786241] ? process_vm_rw+0x356/0x500 [ 30.790283] process_vm_rw+0x3d5/0x500 [ 30.794155] ? kmsan_set_origin_inline+0x6b/0x120 [ 30.798976] SYSC_process_vm_readv+0x126/0x140 [ 30.803538] SyS_process_vm_readv+0x8a/0xb0 [ 30.807837] do_syscall_64+0x309/0x430 [ 30.811704] ? s_show+0xe80/0xe80 [ 30.815138] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 30.820327] RIP: 0033:0x43fe59 [ 30.823493] RSP: 002b:00007ffc712d3ac8 EFLAGS: 00000216 ORIG_RAX: 0000000000000136 [ 30.831175] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe59 [ 30.838420] RDX: 0000000000000009 RSI: 0000000020000a00 RDI: 0000000000000de9 [ 30.845662] RBP: 00000000006ca018 R08: 0000000000000009 R09: 0000000000000000 [ 30.852907] R10: 0000000020001100 R11: 0000000000000216 R12: 0000000000401780 [ 30.860149] R13: 0000000000401810 R14: 0000000000000000 R15: 0000000000000000 [ 30.867835] Dumping ftrace buffer: [ 30.871347] (ftrace buffer empty) [ 30.875026] Kernel Offset: disabled [ 30.878623] Rebooting in 86400 seconds..