[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 28.848285] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 33.016053] random: sshd: uninitialized urandom read (32 bytes read) [ 33.384482] random: sshd: uninitialized urandom read (32 bytes read) [ 34.585733] random: sshd: uninitialized urandom read (32 bytes read) [ 640.073808] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 645.674642] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 646.397183] ================================================================== [ 646.404575] BUG: KMSAN: uninit-value in __list_add_valid+0x1b8/0x450 [ 646.411050] CPU: 1 PID: 15 Comm: ksoftirqd/1 Not tainted 4.17.0+ #9 [ 646.417431] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 646.426792] Call Trace: [ 646.429364] dump_stack+0x185/0x1d0 [ 646.432970] kmsan_report+0x188/0x2a0 [ 646.436748] __msan_warning_32+0x70/0xc0 [ 646.440785] __list_add_valid+0x1b8/0x450 [ 646.444912] enqueue_task_fair+0xe12/0x4490 [ 646.449215] ? __msan_metadata_ptr_for_store_4+0x10/0x20 [ 646.454646] ? update_load_avg+0x2cc0/0x2cc0 [ 646.459034] try_to_wake_up+0x162f/0x2260 [ 646.463179] wake_up_process+0x34/0x40 [ 646.467055] swake_up+0xfb/0x3b0 [ 646.470404] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 646.475847] rcu_report_qs_rnp+0x767/0x880 [ 646.480061] rcu_process_callbacks+0x90a/0x2060 [ 646.484713] ? rcu_scheduler_starting+0xe0/0xe0 [ 646.489362] __do_softirq+0x592/0x979 [ 646.493152] ? ksoftirqd_should_run+0x30/0x30 [ 646.497643] run_ksoftirqd+0x1f/0x40 [ 646.501339] smpboot_thread_fn+0x4ac/0x9a0 [ 646.505573] kthread+0x4db/0x6c0 [ 646.508929] ? cpu_report_death+0x1f0/0x1f0 [ 646.513226] ? kthread_blkcg+0xf0/0xf0 [ 646.517095] ret_from_fork+0x35/0x40 [ 646.520795] [ 646.522414] Uninit was stored to memory at: [ 646.526731] kmsan_internal_chain_origin+0x12b/0x210 [ 646.531815] __msan_chain_origin+0x69/0xc0 [ 646.536034] pick_next_task_fair+0x2474/0x2530 [ 646.540588] pick_next_task+0x1ba/0x420 [ 646.544553] __schedule+0x20f/0x770 [ 646.548160] _cond_resched+0x5e/0xd0 [ 646.551854] unmap_page_range+0x35e0/0x3be0 [ 646.556148] unmap_single_vma+0x445/0x5e0 [ 646.560269] unmap_vmas+0x1f4/0x360 [ 646.563869] exit_mmap+0x4d7/0x980 [ 646.567390] __mmput+0x158/0x600 [ 646.570730] mmput+0xab/0xf0 [ 646.573730] exit_mm+0x6ed/0x7a0 [ 646.577069] do_exit+0xc12/0x3930 [ 646.580502] do_group_exit+0x1a0/0x360 [ 646.584370] __do_sys_exit_group+0x21/0x30 [ 646.588577] __se_sys_exit_group+0x14/0x20 [ 646.592786] __x64_sys_exit_group+0x4c/0x50 [ 646.597080] do_syscall_64+0x15b/0x230 [ 646.600940] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 646.606097] [ 646.607707] Local variable description: ----tlb.i@ldt_arch_exit_mmap [ 646.614165] Variable was created at: [ 646.617855] ldt_arch_exit_mmap+0x46/0x160 [ 646.622066] exit_mmap+0x410/0x980 [ 646.625576] ================================================================== [ 646.632916] Disabling lock debugging due to kernel taint [ 646.638342] Kernel panic - not syncing: panic_on_warn set ... [ 646.638342] [ 646.645685] CPU: 1 PID: 15 Comm: ksoftirqd/1 Tainted: G B 4.17.0+ #9 [ 646.653451] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 646.662791] Call Trace: [ 646.665369] dump_stack+0x185/0x1d0 [ 646.668991] panic+0x3d0/0x990 [ 646.672175] kmsan_report+0x29e/0x2a0 [ 646.675954] __msan_warning_32+0x70/0xc0 [ 646.680002] __list_add_valid+0x1b8/0x450 [ 646.684139] enqueue_task_fair+0xe12/0x4490 [ 646.688444] ? __msan_metadata_ptr_for_store_4+0x10/0x20 [ 646.693877] ? update_load_avg+0x2cc0/0x2cc0 [ 646.698266] try_to_wake_up+0x162f/0x2260 [ 646.702398] wake_up_process+0x34/0x40 [ 646.706260] swake_up+0xfb/0x3b0 [ 646.709603] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 646.715030] rcu_report_qs_rnp+0x767/0x880 [ 646.719252] rcu_process_callbacks+0x90a/0x2060 [ 646.723901] ? rcu_scheduler_starting+0xe0/0xe0 [ 646.728547] __do_softirq+0x592/0x979 [ 646.732324] ? ksoftirqd_should_run+0x30/0x30 [ 646.736801] run_ksoftirqd+0x1f/0x40 [ 646.740491] smpboot_thread_fn+0x4ac/0x9a0 [ 646.744705] kthread+0x4db/0x6c0 [ 646.748046] ? cpu_report_death+0x1f0/0x1f0 [ 646.752352] ? kthread_blkcg+0xf0/0xf0 [ 646.756223] ret_from_fork+0x35/0x40 [ 647.853216] Shutting down cpus with NMI [ 647.869690] Dumping ftrace buffer: [ 647.873215] (ftrace buffer empty) [ 647.876903] Kernel Offset: disabled [ 647.880515] Rebooting in 86400 seconds..