syzbot

random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
EXT2-fs (loop0): error: ext2_check_descriptors: Block bitmap for group 1 not in group (block 0)!
Kernel panic - not syncing: EXT2-fs: panic from previous error

CPU: 1 PID: 3803 Comm: syz-executor753 Not tainted 4.9.96-g71fce1e #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8d87918 ffffffff81eb0b69 ffffffff83b09b80 00000000ffffffff
 ffff8801b5e29100 0000000000000001 ffffffff83b0a980 ffff8801d8d879d8
 ffffffff8141f975 0000000041b58ab3 ffffffff841b8030 ffffffff8141f7b6
Call Trace:
 [<ffffffff81eb0b69>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0b69>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8141f975>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81cb9ccd>] ext2_error.cold.10+0xc2/0x166 fs/ext2/super.c:74
 [<ffffffff818786ee>] ext2_check_descriptors fs/ext2/super.c:689 [inline]
 [<ffffffff818786ee>] ext2_fill_super+0x263e/0x2c90 fs/ext2/super.c:1066
 [<ffffffff81579d57>] mount_bdev+0x2c7/0x390 fs/super.c:1100
 [<ffffffff818724d4>] ext2_mount+0x34/0x40 fs/ext2/super.c:1445
 [<ffffffff8157badc>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815db081>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815e29a9>] vfs_kern_mount fs/namespace.c:973 [inline]
 [<ffffffff815e29a9>] do_new_mount fs/namespace.c:2513 [inline]
 [<ffffffff815e29a9>] do_mount+0x3c9/0x2740 fs/namespace.c:2835
 [<ffffffff815e56fe>] SYSC_mount fs/namespace.c:3051 [inline]
 [<ffffffff815e56fe>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f3313>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..