[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.994961] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.867797] random: sshd: uninitialized urandom read (32 bytes read) [ 21.107041] random: sshd: uninitialized urandom read (32 bytes read) [ 21.894017] random: sshd: uninitialized urandom read (32 bytes read) [ 27.454231] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 32.879977] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.967834] EXT4-fs error (device loop0): ext4_iget:4557: inode #2: comm syz-executor495: root inode unallocated [ 32.978793] Kernel panic - not syncing: EXT4-fs (device loop0): panic forced after error [ 32.978793] [ 32.988493] CPU: 0 PID: 3799 Comm: syz-executor495 Not tainted 4.9.98-g63a812b #17 [ 32.996171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.005499] ffff8801b5747590 ffffffff81eb0e89 ffffffff83cf6400 00000000ffffffff [ 33.013498] 0000000000000000 0000000000000000 ffff8801b6f98718 ffff8801b5747650 [ 33.021488] ffffffff8141f835 0000000041b58ab3 ffffffff843b86e8 ffffffff8141f676 [ 33.029463] Call Trace: [ 33.032023] [] dump_stack+0xc1/0x128 [ 33.037367] [] panic+0x1bf/0x3bc [ 33.042354] [] ? add_taint.cold.6+0x16/0x16 [ 33.048295] [] ? __sync_dirty_buffer+0x139/0x260 [ 33.054678] [] ext4_handle_error.part.116.cold.124+0x1e/0x1e [ 33.062100] [] __ext4_error_inode+0x251/0x350 [ 33.068216] [] ? __ext4_error+0x180/0x180 [ 33.073985] [] ext4_iget+0xa5b/0x3600 [ 33.079405] [] ? __mutex_unlock_slowpath+0x221/0x3c0 [ 33.086124] [] ? __ww_mutex_lock+0x14c0/0x14c0 [ 33.092327] [] ? ext4_get_projid+0x170/0x170 [ 33.098353] [] ? mutex_unlock+0x9/0x10 [ 33.103861] [] ? __alloc_workqueue_key+0x712/0xd90 [ 33.110409] [] ? ext4_calculate_overhead+0xacb/0x1030 [ 33.117222] [] ? debug_object_init+0x16/0x20 [ 33.123250] [] ? mb_cache_create+0x33f/0x450 [ 33.129279] [] ext4_fill_super+0x659e/0xb260 [ 33.135307] [] ? pointer+0x469/0xb00 [ 33.140640] [] ? ext4_calculate_overhead+0x1030/0x1030 [ 33.147538] [] ? pointer+0xb00/0xb00 [ 33.152871] [] ? __mutex_unlock_slowpath+0x25b/0x3c0 [ 33.159593] [] ? snprintf+0xae/0xe0 [ 33.164838] [] ? vsprintf+0x40/0x40 [ 33.170091] [] ? set_blocksize+0x267/0x300 [ 33.175949] [] ? set_bdev_super+0x150/0x150 [ 33.181893] [] mount_bdev+0x2c7/0x390 [ 33.187313] [] ? ext4_calculate_overhead+0x1030/0x1030 [ 33.194209] [] ext4_mount+0x34/0x40 [ 33.199456] [] mount_fs+0x28c/0x370 [ 33.204738] [] vfs_kern_mount.part.29+0xd1/0x3d0 [ 33.211114] [] ? ns_capable_common+0x12a/0x150 [ 33.217315] [] do_mount+0x3c9/0x2740 [ 33.222648] [] ? copy_mount_string+0x40/0x40 [ 33.228677] [] ? kasan_unpoison_shadow+0x35/0x50 [ 33.235048] [] ? kasan_kmalloc+0xc7/0xe0 [ 33.240730] [] ? kmem_cache_alloc_trace+0xfd/0x2b0 [ 33.247279] [] ? copy_mount_options+0x5f/0x320 [ 33.253480] [] ? copy_mount_options+0x1e5/0x320 [ 33.259766] [] SyS_mount+0xfe/0x110 [ 33.265009] [] ? copy_mnt_ns+0x8e0/0x8e0 [ 33.270691] [] do_syscall_64+0x1a6/0x490 [ 33.276370] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.283787] Dumping ftrace buffer: [ 33.287326] (ftrace buffer empty) [ 33.291004] Kernel Offset: disabled [ 33.294619] Rebooting in 86400 seconds..