[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 27.673818] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 28.325898] random: sshd: uninitialized urandom read (32 bytes read) [ 28.543644] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.617290] random: sshd: uninitialized urandom read (32 bytes read) [ 44.632445] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 50.074705] random: sshd: uninitialized urandom read (32 bytes read) 2018/05/20 15:49:00 parsed 1 programs 2018/05/20 15:49:00 executed programs: 0 [ 50.624456] IPVS: ftp: loaded support on port[0] = 21 [ 50.635356] IPVS: ftp: loaded support on port[0] = 21 [ 50.657786] IPVS: ftp: loaded support on port[0] = 21 [ 50.661414] IPVS: ftp: loaded support on port[0] = 21 [ 50.670553] IPVS: ftp: loaded support on port[0] = 21 [ 50.675474] IPVS: ftp: loaded support on port[0] = 21 [ 50.704914] IPVS: ftp: loaded support on port[0] = 21 [ 50.711803] IPVS: ftp: loaded support on port[0] = 21 [ 50.816957] ip (4492) used greatest stack depth: 54552 bytes left [ 51.056353] ip (4530) used greatest stack depth: 54072 bytes left [ 51.120158] ================================================================== [ 51.127561] BUG: KMSAN: uninit-value in __list_del_entry_valid+0x23a/0x440 [ 51.134557] CPU: 1 PID: 14 Comm: migration/1 Not tainted 4.17.0-rc5+ #101 [ 51.141459] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.150797] Call Trace: [ 51.153364] dump_stack+0x185/0x1d0 [ 51.156969] ? __list_del_entry_valid+0x23a/0x440 [ 51.161789] kmsan_report+0x149/0x260 [ 51.165576] __msan_warning_32+0x6e/0xc0 [ 51.169621] __list_del_entry_valid+0x23a/0x440 [ 51.174268] dequeue_task_fair+0xad7/0x32f0 [ 51.178575] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 51.183916] ? llsec_lookup_key+0x6ce/0xbf0 [ 51.188215] ? llsec_lookup_key+0x6ce/0xbf0 [ 51.192511] move_queued_task+0x2e2/0xd50 [ 51.196631] ? sched_clock_cpu+0x7e/0x9c0 [ 51.200757] ? llsec_lookup_key+0x6ce/0xbf0 [ 51.205065] ? enqueue_task_fair+0x4470/0x4470 [ 51.209631] migration_cpu_stop+0x4d0/0x6d0 [ 51.213933] cpu_stopper_thread+0x377/0x7a0 [ 51.218238] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 51.223663] ? sched_exec+0x2c0/0x2c0 [ 51.227443] ? cpu_stop_should_run+0x160/0x160 [ 51.232014] smpboot_thread_fn+0x488/0x970 [ 51.236229] kthread+0x4e3/0x6d0 [ 51.239578] ? cpu_report_death+0x1e0/0x1e0 [ 51.243878] ? kthread_blkcg+0xf0/0xf0 [ 51.247744] ret_from_fork+0x35/0x40 [ 51.251430] [ 51.253047] Uninit was stored to memory at: [ 51.257356] kmsan_internal_chain_origin+0x12b/0x210 [ 51.262433] __msan_chain_origin+0x69/0xc0 [ 51.266651] pick_next_task_fair+0x2464/0x2520 [ 51.271207] pick_next_task+0x1b1/0x410 [ 51.275160] __schedule+0x20b/0x730 [ 51.278762] do_task_dead+0xcc/0xf0 [ 51.282364] do_exit+0x340e/0x38d0 [ 51.285878] do_group_exit+0x1a0/0x360 [ 51.289740] __do_sys_exit_group+0x21/0x30 [ 51.293968] __se_sys_exit_group+0x14/0x20 [ 51.298182] __x64_sys_exit_group+0x4c/0x50 [ 51.302484] do_syscall_64+0x154/0x220 [ 51.306348] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.311513] Local variable description: ----flags.i.i.i.i@_raw_spin_lock_irqsave [ 51.319019] Variable was created at: [ 51.322711] _raw_spin_lock_irqsave+0x45/0xf0 [ 51.327188] do_task_dead+0x40/0xf0 [ 51.330793] ================================================================== [ 51.338208] Disabling lock debugging due to kernel taint [ 51.343631] Kernel panic - not syncing: panic_on_warn set ... [ 51.343631] [ 51.350975] CPU: 1 PID: 14 Comm: migration/1 Tainted: G B 4.17.0-rc5+ #101 [ 51.359262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.368587] Call Trace: [ 51.371152] dump_stack+0x185/0x1d0 [ 51.374755] panic+0x39d/0x940 [ 51.377932] ? __list_del_entry_valid+0x23a/0x440 [ 51.382751] kmsan_report+0x260/0x260 [ 51.386529] __msan_warning_32+0x6e/0xc0 [ 51.390569] __list_del_entry_valid+0x23a/0x440 [ 51.395387] dequeue_task_fair+0xad7/0x32f0 [ 51.399682] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 51.405031] ? llsec_lookup_key+0x6ce/0xbf0 [ 51.409334] ? llsec_lookup_key+0x6ce/0xbf0 [ 51.413629] move_queued_task+0x2e2/0xd50 [ 51.417752] ? sched_clock_cpu+0x7e/0x9c0 [ 51.421873] ? llsec_lookup_key+0x6ce/0xbf0 [ 51.426188] ? enqueue_task_fair+0x4470/0x4470 [ 51.430760] migration_cpu_stop+0x4d0/0x6d0 [ 51.435061] cpu_stopper_thread+0x377/0x7a0 [ 51.439358] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 51.444785] ? sched_exec+0x2c0/0x2c0 [ 51.448564] ? cpu_stop_should_run+0x160/0x160 [ 51.453123] smpboot_thread_fn+0x488/0x970 [ 51.457344] kthread+0x4e3/0x6d0 [ 51.460696] ? cpu_report_death+0x1e0/0x1e0 [ 51.464995] ? kthread_blkcg+0xf0/0xf0 [ 51.468857] ret_from_fork+0x35/0x40 [ 52.585004] Shutting down cpus with NMI [ 52.601032] Dumping ftrace buffer: [ 52.604572] (ftrace buffer empty) [ 52.608262] Kernel Offset: disabled [ 52.611871] Rebooting in 86400 seconds..