[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.354219] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.508055] random: sshd: uninitialized urandom read (32 bytes read) [ 23.936371] random: sshd: uninitialized urandom read (32 bytes read) [ 24.525324] random: sshd: uninitialized urandom read (32 bytes read) [ 31.889790] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 37.404677] 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 [ 40.353407] INFO: trying to register non-static key. [ 40.358542] the code is fine but needs lockdep annotation. [ 40.364148] turning off the locking correctness validator. [ 40.369757] CPU: 1 PID: 4387 Comm: syz-executor168 Not tainted 4.9.99-gc2f9bce #25 [ 40.377452] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.386792] ffff8801d9387790 ffffffff81eb0f09 0000000000000000 ffffffff85b2d700 [ 40.394822] ffff8801cfeeb020 ffffffff85583c08 0000000000000000 ffff8801d9387810 [ 40.402850] ffffffff81230b40 ffffffff8558c640 ffff8801d3fc9880 000000000000377a [ 40.410902] Call Trace: [ 40.413477] [] dump_stack+0xc1/0x128 [ 40.418839] [] register_lock_class+0x1460/0x1470 [ 40.425245] [] __lock_acquire+0x169/0x4070 [ 40.431130] [] ? __lock_is_held+0xa2/0xf0 [ 40.436927] [] ? debug_check_no_locks_freed+0x210/0x210 [ 40.443938] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 40.450254] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 40.457086] [] ? _raw_spin_unlock_irq+0x38/0x50 [ 40.463395] [] ? finish_task_switch+0x1ed/0x640 [ 40.469705] [] ? finish_task_switch+0x1c1/0x640 [ 40.476018] [] ? __schedule+0x61f/0x1bd0 [ 40.481728] [] lock_acquire+0x130/0x3e0 [ 40.487346] [] ? tun_do_read.part.42+0x74d/0x1250 [ 40.493836] [] _raw_spin_lock+0x36/0x50 [ 40.499462] [] ? tun_do_read.part.42+0x74d/0x1250 [ 40.505948] [] tun_do_read.part.42+0x74d/0x1250 [ 40.512261] [] ? tun_cleanup_tx_array.part.39+0x1f0/0x1f0 [ 40.519443] [] ? check_preemption_disabled+0x3b/0x170 [ 40.526275] [] ? wake_up_q+0xe0/0xe0 [ 40.531633] [] tun_chr_read_iter+0x161/0x1f0 [ 40.537686] [] __vfs_read+0x3dd/0x570 [ 40.543130] [] ? do_iter_readv_writev+0x4b0/0x4b0 [ 40.549618] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 40.558098] [] ? fsnotify+0x1100/0x1100 [ 40.563713] [] ? avc_policy_seqno+0x9/0x20 [ 40.569590] [] ? selinux_file_permission+0x82/0x470 [ 40.576246] [] ? rw_verify_area+0xe5/0x2b0 [ 40.582119] [] vfs_read+0x120/0x380 [ 40.587384] [] SyS_pread64+0x145/0x170 [ 40.592911] [] ? SyS_write+0x1c0/0x1c0 executing program [ 40.598436] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 40.605264] [] ? do_syscall_64+0x48/0x490 [ 40.611049] [] ? SyS_write+0x1c0/0x1c0 [ 40.616575] [] do_syscall_64+0x1a6/0x490 [ 40.622273] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program