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 '10.128.10.17' (ECDSA) to the list of known hosts. 2018/04/11 07:00:15 parsed 1 programs 2018/04/11 07:00:15 executed programs: 0 2018/04/11 07:00:20 executed programs: 524 2018/04/11 07:00:25 executed programs: 1039 2018/04/11 07:00:30 executed programs: 1550 2018/04/11 07:00:35 executed programs: 2063 2018/04/11 07:00:40 executed programs: 2568 2018/04/11 07:00:45 executed programs: 3083 2018/04/11 07:00:50 executed programs: 3579 2018/04/11 07:00:55 executed programs: 4080 syzkaller login: [ 133.539058] ================================================================== [ 133.546480] BUG: KMSAN: uninit-value in rcu_segcblist_pend_cbs+0xa9/0xf0 [ 133.553321] CPU: 1 PID: 14721 Comm: udevd Not tainted 4.16.0+ #83 [ 133.559545] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 133.568890] Call Trace: [ 133.571465] [ 133.573619] dump_stack+0x185/0x1d0 [ 133.577247] ? rcu_segcblist_pend_cbs+0xa9/0xf0 [ 133.581910] kmsan_report+0x142/0x240 [ 133.585709] __msan_warning_32+0x6c/0xb0 [ 133.589784] rcu_segcblist_pend_cbs+0xa9/0xf0 [ 133.594283] rcu_accelerate_cbs+0x7e/0xca0 [ 133.598519] ? _raw_spin_lock_irqsave+0x45/0xf0 [ 133.603193] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 133.608556] rcu_process_callbacks+0x6fc/0x2070 [ 133.613232] ? rcu_scheduler_starting+0xe0/0xe0 [ 133.617899] __do_softirq+0x56d/0x93d [ 133.621700] irq_exit+0x202/0x240 [ 133.625157] exiting_irq+0xe/0x10 [ 133.628611] smp_apic_timer_interrupt+0x64/0x90 [ 133.633279] apic_timer_interrupt+0xf/0x20 [ 133.637505] [ 133.639744] RIP: 0010:msan_get_shadow_origin_ptr+0x1ef/0x230 [ 133.645530] RSP: 0018:ffff8801b4f1f200 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff12 [ 133.653235] RAX: ffff8801c086f628 RBX: ffffffff8832d000 RCX: ffff880000000000 [ 133.660499] RDX: 0000000000000628 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 [ 133.667762] RBP: ffff8801b4f1f230 R08: 0000000000000000 R09: 0000000000000002 [ 133.675024] R10: 0000000000000000 R11: 0000000000000000 R12: 00000001bf02f000 [ 133.682292] R13: 000000000a3daba0 R14: ffffffff8832c000 R15: 0000000000000628 [ 133.689575] __msan_metadata_ptr_for_store_8+0x13/0x20 [ 133.694851] unmap_page_range+0x1a03/0x3be0 [ 133.699191] unmap_single_vma+0x45b/0x5f0 [ 133.703342] unmap_vmas+0x1f4/0x360 [ 133.706975] exit_mmap+0x3da/0x950 [ 133.710518] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 133.715876] ? __mmput+0x3f/0x610 [ 133.719330] __mmput+0x16c/0x610 [ 133.722695] mmput+0xab/0xf0 [ 133.725717] flush_old_exec+0x1adb/0x2170 [ 133.729869] load_elf_binary+0x134d/0x8f90 [ 133.734116] ? kmsan_set_origin_inline+0x6b/0x120 [ 133.738964] ? __msan_poison_alloca+0x15c/0x1d0 [ 133.743630] ? kmsan_set_origin_inline+0x6b/0x120 [ 133.748468] ? __msan_poison_alloca+0x15c/0x1d0 [ 133.753139] ? search_binary_handler+0x2ef/0xac0 [ 133.757893] ? load_script+0x5c/0xcd0 [ 133.761692] ? search_binary_handler+0x2ef/0xac0 [ 133.766441] ? load_script+0x61/0xcd0 [ 133.770239] ? load_elf_binary+0x4ba1/0x8f90 [ 133.774992] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 133.780352] ? load_script+0xcd0/0xcd0 [ 133.784235] search_binary_handler+0x2ef/0xac0 [ 133.788819] do_execveat_common+0x1f4d/0x2ce0 [ 133.793323] SYSC_execve+0xe2/0x110 [ 133.796949] SyS_execve+0x56/0x80 [ 133.800399] do_syscall_64+0x309/0x430 [ 133.804298] ? set_binfmt+0x1b0/0x1b0 [ 133.808101] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 133.813287] RIP: 0033:0x7f926a441207 [ 133.816985] RSP: 002b:00007fffa351eb48 EFLAGS: 00000206 ORIG_RAX: 000000000000003b [ 133.824690] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f926a441207 [ 133.831955] RDX: 00000000015734b0 RSI: 00007fffa351ec40 RDI: 00007fffa351fc50 [ 133.839219] RBP: 0000000000625500 R08: 0000000000000e7e R09: 0000000000000e7e [ 133.846479] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000015734b0 [ 133.853746] R13: 0000000000000007 R14: 000000000156c250 R15: 0000000000000005 [ 133.861009] [ 133.862625] Uninit was stored to memory at: [ 133.866947] kmsan_internal_chain_origin+0x12b/0x210 [ 133.872049] __msan_chain_origin+0x69/0xc0 [ 133.876315] rcu_segcblist_enqueue+0x275/0x2d0 [ 133.880910] __call_rcu+0x227/0xef0 [ 133.884535] call_rcu_sched+0x32/0x40 [ 133.888329] release_task+0x24b9/0x2530 [ 133.892303] do_exit+0x2d91/0x38d0 [ 133.895841] do_group_exit+0x1a0/0x360 [ 133.899724] get_signal+0x1320/0x1f20 [ 133.903520] do_signal+0xb8/0x1c80 [ 133.907055] prepare_exit_to_usermode+0x271/0x3a0 [ 133.911898] syscall_return_slowpath+0xe9/0x700 [ 133.916563] do_syscall_64+0x36d/0x430 [ 133.920451] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 133.925630] Local variable description: ----ac@__alloc_pages_nodemask [ 133.932197] Variable was created at: [ 133.935910] __alloc_pages_nodemask+0x196/0x5dc0 [ 133.940661] alloc_pages_current+0x6b5/0x970 [ 133.945055] ================================================================== [ 133.952395] Disabling lock debugging due to kernel taint [ 133.957817] Kernel panic - not syncing: panic_on_warn set ... [ 133.957817] [ 133.965154] CPU: 1 PID: 14721 Comm: udevd Tainted: G B 4.16.0+ #83 [ 133.972655] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 133.981979] Call Trace: [ 133.984536] [ 133.986663] dump_stack+0x185/0x1d0 [ 133.990265] panic+0x39d/0x940 [ 133.993440] ? rcu_segcblist_pend_cbs+0xa9/0xf0 [ 133.998083] kmsan_report+0x238/0x240 [ 134.001858] __msan_warning_32+0x6c/0xb0 [ 134.005903] rcu_segcblist_pend_cbs+0xa9/0xf0 [ 134.010371] rcu_accelerate_cbs+0x7e/0xca0 [ 134.014578] ? _raw_spin_lock_irqsave+0x45/0xf0 [ 134.019223] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 134.024559] rcu_process_callbacks+0x6fc/0x2070 [ 134.029204] ? rcu_scheduler_starting+0xe0/0xe0 [ 134.033846] __do_softirq+0x56d/0x93d [ 134.037625] irq_exit+0x202/0x240 [ 134.041052] exiting_irq+0xe/0x10 [ 134.044481] smp_apic_timer_interrupt+0x64/0x90 [ 134.049124] apic_timer_interrupt+0xf/0x20 [ 134.053330] [ 134.055542] RIP: 0010:msan_get_shadow_origin_ptr+0x1ef/0x230 [ 134.061311] RSP: 0018:ffff8801b4f1f200 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff12 [ 134.068992] RAX: ffff8801c086f628 RBX: ffffffff8832d000 RCX: ffff880000000000 [ 134.076236] RDX: 0000000000000628 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 [ 134.083477] RBP: ffff8801b4f1f230 R08: 0000000000000000 R09: 0000000000000002 [ 134.090718] R10: 0000000000000000 R11: 0000000000000000 R12: 00000001bf02f000 [ 134.097961] R13: 000000000a3daba0 R14: ffffffff8832c000 R15: 0000000000000628 [ 134.105211] __msan_metadata_ptr_for_store_8+0x13/0x20 [ 134.110461] unmap_page_range+0x1a03/0x3be0 [ 134.114766] unmap_single_vma+0x45b/0x5f0 [ 134.118889] unmap_vmas+0x1f4/0x360 [ 134.122490] exit_mmap+0x3da/0x950 [ 134.126010] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 134.131353] ? __mmput+0x3f/0x610 [ 134.134777] __mmput+0x16c/0x610 [ 134.138117] mmput+0xab/0xf0 [ 134.141115] flush_old_exec+0x1adb/0x2170 [ 134.145244] load_elf_binary+0x134d/0x8f90 [ 134.149457] ? kmsan_set_origin_inline+0x6b/0x120 [ 134.154271] ? __msan_poison_alloca+0x15c/0x1d0 [ 134.158914] ? kmsan_set_origin_inline+0x6b/0x120 [ 134.163729] ? __msan_poison_alloca+0x15c/0x1d0 [ 134.168371] ? search_binary_handler+0x2ef/0xac0 [ 134.173100] ? load_script+0x5c/0xcd0 [ 134.176872] ? search_binary_handler+0x2ef/0xac0 [ 134.181598] ? load_script+0x61/0xcd0 [ 134.185372] ? load_elf_binary+0x4ba1/0x8f90 [ 134.189752] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 134.195090] ? load_script+0xcd0/0xcd0 [ 134.198958] search_binary_handler+0x2ef/0xac0 [ 134.203517] do_execveat_common+0x1f4d/0x2ce0 [ 134.207993] SYSC_execve+0xe2/0x110 [ 134.211599] SyS_execve+0x56/0x80 [ 134.215031] do_syscall_64+0x309/0x430 [ 134.218900] ? set_binfmt+0x1b0/0x1b0 [ 134.222676] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 134.227838] RIP: 0033:0x7f926a441207 [ 134.231520] RSP: 002b:00007fffa351eb48 EFLAGS: 00000206 ORIG_RAX: 000000000000003b [ 134.239199] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f926a441207 [ 134.246441] RDX: 00000000015734b0 RSI: 00007fffa351ec40 RDI: 00007fffa351fc50 [ 134.253685] RBP: 0000000000625500 R08: 0000000000000e7e R09: 0000000000000e7e [ 134.260928] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000015734b0 [ 134.268171] R13: 0000000000000007 R14: 000000000156c250 R15: 0000000000000005 [ 134.275916] Dumping ftrace buffer: [ 134.279429] (ftrace buffer empty) [ 134.283111] Kernel Offset: disabled [ 134.286713] Rebooting in 86400 seconds..