[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   11.796162] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   25.191179] random: sshd: uninitialized urandom read (32 bytes read)
[   25.602711] random: sshd: uninitialized urandom read (32 bytes read)
[   26.154587] random: sshd: uninitialized urandom read (32 bytes read)
[   42.545795] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.25' (ECDSA) to the list of known hosts.
[   48.113050] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   48.206546] EXT2-fs (loop0): error: ext2_check_descriptors: Block bitmap for group 1 not in group (block 0)!
[   48.216548] Kernel panic - not syncing: EXT2-fs: panic from previous error
[   48.216548] 
[   48.225008] CPU: 1 PID: 3803 Comm: syz-executor753 Not tainted 4.9.96-g71fce1e #10
[   48.232681] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.242006]  ffff8801d8d87918 ffffffff81eb0b69 ffffffff83b09b80 00000000ffffffff
[   48.249977]  ffff8801b5e29100 0000000000000001 ffffffff83b0a980 ffff8801d8d879d8
[   48.257947]  ffffffff8141f975 0000000041b58ab3 ffffffff841b8030 ffffffff8141f7b6
[   48.265919] Call Trace:
[   48.268478]  [<ffffffff81eb0b69>] dump_stack+0xc1/0x128
[   48.273811]  [<ffffffff8141f975>] panic+0x1bf/0x3bc
[   48.278797]  [<ffffffff8141f7b6>] ? add_taint.cold.6+0x16/0x16
[   48.284738]  [<ffffffff8162b7ba>] ? sync_dirty_buffer+0x1a/0x20
[   48.290766]  [<ffffffff81cb9cbc>] ? ext2_error.cold.10+0xb1/0x166
[   48.296974]  [<ffffffff81cb9ccd>] ext2_error.cold.10+0xc2/0x166
[   48.303005]  [<ffffffff81875360>] ? ext2_put_super+0x450/0x450
[   48.308950]  [<ffffffff811b9335>] ? __might_sleep+0x95/0x1a0
[   48.314715]  [<ffffffff818786ee>] ext2_fill_super+0x263e/0x2c90
[   48.320746]  [<ffffffff818760b0>] ? ext2_setup_super+0x3b0/0x3b0
[   48.326863]  [<ffffffff81576a90>] ? set_bdev_super+0x150/0x150
[   48.332802]  [<ffffffff81579d57>] mount_bdev+0x2c7/0x390
[   48.338220]  [<ffffffff818760b0>] ? ext2_setup_super+0x3b0/0x3b0
[   48.344339]  [<ffffffff818724d4>] ext2_mount+0x34/0x40
[   48.349584]  [<ffffffff8157badc>] mount_fs+0x28c/0x370
[   48.354834]  [<ffffffff815db081>] vfs_kern_mount.part.29+0xd1/0x3d0
[   48.361209]  [<ffffffff811531fa>] ? ns_capable_common+0x12a/0x150
[   48.367408]  [<ffffffff815e29a9>] do_mount+0x3c9/0x2740
[   48.372741]  [<ffffffff815e25e0>] ? copy_mount_string+0x40/0x40
[   48.378768]  [<ffffffff81538575>] ? kasan_unpoison_shadow+0x35/0x50
[   48.385141]  [<ffffffff81538807>] ? kasan_kmalloc+0xc7/0xe0
[   48.390820]  [<ffffffff815349cd>] ? kmem_cache_alloc_trace+0xfd/0x2b0
[   48.397368]  [<ffffffff815e22df>] ? copy_mount_options+0x5f/0x320
[   48.403568]  [<ffffffff815e2465>] ? copy_mount_options+0x1e5/0x320
[   48.409856]  [<ffffffff815e56fe>] SyS_mount+0xfe/0x110
[   48.415101]  [<ffffffff815e5600>] ? copy_mnt_ns+0x8e0/0x8e0
[   48.420785]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   48.426471]  [<ffffffff839f3313>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   48.433807] Dumping ftrace buffer:
[   48.437336]    (ftrace buffer empty)
[   48.441018] Kernel Offset: disabled
[   48.444621] Rebooting in 86400 seconds..