[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.809652] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.470144] random: sshd: uninitialized urandom read (32 bytes read) [ 23.819077] random: sshd: uninitialized urandom read (32 bytes read) [ 24.551733] random: sshd: uninitialized urandom read (32 bytes read) [ 31.134108] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts. [ 36.609478] 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 [ 39.074368] INFO: trying to register non-static key. [ 39.079530] the code is fine but needs lockdep annotation. [ 39.085150] turning off the locking correctness validator. [ 39.090792] CPU: 0 PID: 4552 Comm: syz-executor954 Not tainted 4.17.0-rc4+ #37 [ 39.098152] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.107509] Call Trace: [ 39.110104] dump_stack+0x1b9/0x294 [ 39.113735] ? dump_stack_print_info.cold.2+0x52/0x52 [ 39.118929] ? vprintk_func+0x81/0xe7 [ 39.122733] register_lock_class+0x1dd2/0x2630 [ 39.127321] ? __lock_acquire+0x7f5/0x5140 [ 39.131560] ? update_curr+0x4d5/0xbe0 [ 39.135450] ? check_noncircular+0x20/0x20 [ 39.139684] ? debug_check_no_locks_freed+0x310/0x310 [ 39.144874] ? __lock_is_held+0xb5/0x140 [ 39.148938] ? set_next_entity+0x2ae/0xaf0 [ 39.153177] ? dequeue_entity+0x3f8/0x15c0 [ 39.157415] ? update_load_avg+0x2570/0x2570 [ 39.161822] ? reweight_task+0x130/0x130 [ 39.165884] ? account_entity_enqueue+0x3db/0x6f0 [ 39.170735] ? graph_lock+0x170/0x170 [ 39.174540] ? pick_next_task_fair+0x973/0x1660 [ 39.179305] ? __update_load_avg_blocked_se.isra.33+0x460/0x460 [ 39.185579] ? graph_lock+0x170/0x170 [ 39.189384] ? find_held_lock+0x36/0x1c0 [ 39.193452] ? lock_downgrade+0x8e0/0x8e0 [ 39.197610] ? finish_task_switch+0x182/0x810 [ 39.202121] __lock_acquire+0x1a7/0x5140 [ 39.206190] ? kasan_check_read+0x11/0x20 [ 39.210342] ? do_raw_spin_unlock+0x9e/0x2e0 [ 39.214752] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 39.219339] ? compat_start_thread+0x80/0x80 [ 39.223750] ? _raw_spin_unlock_irq+0x27/0x70 [ 39.228254] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 39.233275] ? debug_check_no_locks_freed+0x310/0x310 [ 39.238467] ? kasan_check_write+0x14/0x20 [ 39.242702] ? finish_task_switch+0x28b/0x810 [ 39.247200] ? preempt_notifier_register+0x1e0/0x1e0 [ 39.252304] ? lock_repin_lock+0x410/0x410 [ 39.256544] ? __schedule+0x809/0x1e30 [ 39.260432] ? print_usage_bug+0xc0/0xc0 [ 39.264495] ? __sched_text_start+0x8/0x8 [ 39.268643] ? graph_lock+0x170/0x170 [ 39.272443] ? find_held_lock+0x36/0x1c0 [ 39.276562] ? find_held_lock+0x36/0x1c0 [ 39.280632] lock_acquire+0x1dc/0x520 [ 39.284439] ? tun_do_read+0x18b1/0x29f0 [ 39.288506] ? lock_downgrade+0x8e0/0x8e0 [ 39.292661] ? lock_release+0xa10/0xa10 [ 39.296641] ? kasan_check_read+0x11/0x20 [ 39.300793] ? do_raw_spin_unlock+0x9e/0x2e0 [ 39.305204] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 39.310228] ? kasan_check_write+0x14/0x20 [ 39.314465] ? do_raw_spin_lock+0xc1/0x200 [ 39.318705] _raw_spin_lock+0x2a/0x40 [ 39.322508] ? tun_do_read+0x18b1/0x29f0 [ 39.326575] tun_do_read+0x18b1/0x29f0 [ 39.330460] ? __unqueue_futex+0x2d0/0x2d0 [ 39.334698] ? tun_flow_update+0x10d0/0x10d0 [ 39.339111] ? find_held_lock+0x36/0x1c0 [ 39.343175] ? graph_lock+0x170/0x170 [ 39.346986] ? kasan_check_read+0x11/0x20 [ 39.351140] ? do_raw_spin_unlock+0x9e/0x2e0 [ 39.355552] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 39.360135] ? find_held_lock+0x36/0x1c0 [ 39.364208] ? preempt_notifier_register+0x1e0/0x1e0 [ 39.369317] ? kasan_check_read+0x11/0x20 [ 39.373469] ? rcu_is_watching+0x85/0x140 [ 39.377620] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 39.382817] ? wake_up_q+0x100/0x100 [ 39.386626] tun_chr_read_iter+0xe5/0x1e0 [ 39.390776] __vfs_read+0x696/0xa50 [ 39.394406] ? vfs_copy_file_range+0xb80/0xb80 [ 39.398995] ? fsnotify+0xfc0/0xfc0 [ 39.402628] ? fsnotify_first_mark+0x330/0x330 [ 39.407212] ? __fget_light+0x2ef/0x430 [ 39.411190] ? fget_raw+0x20/0x20 [ 39.414645] ? rw_verify_area+0x118/0x360 [ 39.418795] vfs_read+0x17f/0x3d0 [ 39.422251] ksys_pread64+0x174/0x1a0 [ 39.426051] ? __ia32_sys_write+0xb0/0xb0 [ 39.430200] ? exit_to_usermode_loop+0x1ef/0x310 [ 39.434957] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 39.439801] ? ksys_ioctl+0x81/0xd0 [ 39.443428] __x64_sys_pread64+0x97/0xf0 [ 39.447493] do_syscall_64+0x1b1/0x800 [ 39.451378] ? finish_task_switch+0x1ca/0x810 [ 39.455879] ? syscall_return_slowpath+0x5c0/0x5c0 [ 39.460811] ? syscall_return_slowpath+0x30f/0x5c0 [ 39.465744] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 39.471113] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.475957] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.481142] RIP: 0033:0x4493f9 [ 39.484325] RSP: 002b:00007f13d1c9cda8 EFLAGS: 00000293 ORIG_RAX: 0000000000000011 [ 39.492029] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 00000000004493f9 [ 39.499304] RDX: 000000000000006e RSI: 0000000020000080 RDI: 000000000000008f [ 39.506573] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 39.513847] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dac20 executing program [ 39.521115] R13: 74656e2f7665642f R14: 00007f13d1c9d9c0 R15: 0000000000000001 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 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 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