[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.252604] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.109118] random: sshd: uninitialized urandom read (32 bytes read) [ 21.331789] random: sshd: uninitialized urandom read (32 bytes read) [ 22.076961] random: sshd: uninitialized urandom read (32 bytes read) [ 53.488440] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 58.966254] 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 [ 61.319213] INFO: trying to register non-static key. [ 61.324351] the code is fine but needs lockdep annotation. [ 61.329963] turning off the locking correctness validator. [ 61.335581] CPU: 0 PID: 4492 Comm: syz-executor326 Not tainted 4.17.0-rc4+ #46 [ 61.343310] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.352660] Call Trace: [ 61.355246] dump_stack+0x1b9/0x294 [ 61.358876] ? dump_stack_print_info.cold.2+0x52/0x52 [ 61.364064] ? vprintk_func+0x81/0xe7 [ 61.367864] register_lock_class+0x1dd2/0x2630 [ 61.372441] ? __lock_acquire+0x7f5/0x5140 [ 61.376671] ? update_curr+0x4d5/0xbe0 [ 61.380553] ? check_noncircular+0x20/0x20 [ 61.384779] ? debug_check_no_locks_freed+0x310/0x310 [ 61.389965] ? __lock_is_held+0xb5/0x140 [ 61.394029] ? set_next_entity+0x2ae/0xaf0 [ 61.398258] ? dequeue_entity+0x3f8/0x15c0 [ 61.402486] ? update_load_avg+0x2570/0x2570 [ 61.406888] ? reweight_task+0x130/0x130 [ 61.410947] ? account_entity_enqueue+0x3db/0x6f0 [ 61.415783] ? graph_lock+0x170/0x170 [ 61.419576] ? graph_lock+0x170/0x170 [ 61.423373] ? __update_load_avg_blocked_se.isra.33+0x460/0x460 [ 61.429422] ? graph_lock+0x170/0x170 [ 61.433221] ? find_held_lock+0x36/0x1c0 [ 61.437279] ? lock_downgrade+0x8e0/0x8e0 [ 61.441423] ? finish_task_switch+0x182/0x840 [ 61.445913] __lock_acquire+0x1a7/0x5140 [ 61.449973] ? kasan_check_read+0x11/0x20 [ 61.454117] ? do_raw_spin_unlock+0x9e/0x2e0 [ 61.458520] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 61.463097] ? compat_start_thread+0x80/0x80 [ 61.467497] ? _raw_spin_unlock_irq+0x27/0x70 [ 61.471990] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 61.477004] ? debug_check_no_locks_freed+0x310/0x310 [ 61.482191] ? kasan_check_write+0x14/0x20 [ 61.486420] ? finish_task_switch+0x28b/0x840 [ 61.490910] ? preempt_notifier_register+0x1e0/0x1e0 [ 61.496007] ? lock_repin_lock+0x410/0x410 [ 61.500237] ? __schedule+0x809/0x1e30 [ 61.504117] ? print_usage_bug+0xc0/0xc0 [ 61.508173] ? __sched_text_start+0x8/0x8 [ 61.512319] ? graph_lock+0x170/0x170 [ 61.516114] ? find_held_lock+0x36/0x1c0 [ 61.520172] ? find_held_lock+0x36/0x1c0 [ 61.524235] lock_acquire+0x1dc/0x520 [ 61.528033] ? tun_do_read+0x18b1/0x29f0 [ 61.532087] ? lock_downgrade+0x8e0/0x8e0 [ 61.536231] ? lock_release+0xa10/0xa10 [ 61.540203] ? kasan_check_read+0x11/0x20 [ 61.544346] ? do_raw_spin_unlock+0x9e/0x2e0 [ 61.548747] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 61.553330] ? kasan_check_write+0x14/0x20 [ 61.557560] ? do_raw_spin_lock+0xc1/0x200 [ 61.561791] _raw_spin_lock+0x2a/0x40 [ 61.565587] ? tun_do_read+0x18b1/0x29f0 [ 61.569642] tun_do_read+0x18b1/0x29f0 [ 61.573526] ? __unqueue_futex+0x2d0/0x2d0 [ 61.577754] ? tun_flow_update+0x10d0/0x10d0 [ 61.582157] ? find_held_lock+0x36/0x1c0 [ 61.586212] ? graph_lock+0x170/0x170 [ 61.590012] ? kasan_check_read+0x11/0x20 [ 61.594155] ? do_raw_spin_unlock+0x9e/0x2e0 [ 61.598561] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 61.603136] ? find_held_lock+0x36/0x1c0 [ 61.607195] ? preempt_notifier_register+0x1e0/0x1e0 [ 61.612293] ? kasan_check_read+0x11/0x20 [ 61.616442] ? rcu_is_watching+0x85/0x140 [ 61.620586] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 61.625771] ? wake_up_q+0x100/0x100 [ 61.629486] tun_chr_read_iter+0xe5/0x1e0 [ 61.633628] __vfs_read+0x696/0xa50 [ 61.637249] ? vfs_copy_file_range+0xb80/0xb80 [ 61.641826] ? fsnotify+0xfc0/0xfc0 [ 61.645445] ? fsnotify_first_mark+0x330/0x330 [ 61.650021] ? __fget_light+0x2ef/0x430 [ 61.653994] ? fget_raw+0x20/0x20 [ 61.657441] ? rw_verify_area+0x118/0x360 [ 61.661585] vfs_read+0x17f/0x3d0 [ 61.665035] ksys_pread64+0x174/0x1a0 [ 61.668827] ? __ia32_sys_write+0xb0/0xb0 [ 61.672972] ? exit_to_usermode_loop+0x1ef/0x310 [ 61.677723] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 61.682565] ? ksys_ioctl+0x81/0xd0 [ 61.686186] __x64_sys_pread64+0x97/0xf0 [ 61.690242] do_syscall_64+0x1b1/0x800 [ 61.694128] ? finish_task_switch+0x1ca/0x840 [ 61.698621] ? syscall_return_slowpath+0x5c0/0x5c0 [ 61.703546] ? syscall_return_slowpath+0x30f/0x5c0 [ 61.708470] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 61.713830] ? trace_hardirqs_off_thunk+0x1a/0x1c executing program [ 61.718671] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 61.723851] RIP: 0033:0x449379 [ 61.727030] RSP: 002b:00007fa8e70e8da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000011 [ 61.734730] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000449379 [ 61.741995] RDX: 0000000000000062 RSI: 0000000020000080 RDI: 000000000000008d [ 61.749257] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 61.756517] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dac20 [ 61.763778] R13: 0001000000000000 R14: 74656e2f7665642f 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 executing program executing program