Reiserfs crashes if regular file .reiserfs_priv exists in root directory
of reiserfs partitions. This is reproducible on different builds of
2.6.29, 2.6.30 and 2.6.31 kernel. On 2.6.29 and older 2.6.30 kernels,
crash will occur only if CONFIG_REISERFS_XATTR=y.

How to reproduce:
1. Create reiserfs partition.
2. On older kernel compiled with CONFIG_REISERFS_XATTR=n create file
.reiserfs_priv in partition root.
3. Mount this partition on newer kernel. Older kernels compiled with
CONFIG_REISERFS_XATT...