The xfs_da3_fixhashpath function in fs/xfs/xfs_da_btree.c in the xfs implementation in the Linux kernel before 3.14.2 does not properly compare btree hash values, which allows local users to cause a denial of service (filesystem corruption, and OOPS or panic) via operations on directories that have hash collisions, as demonstrated by rmdir operations.
http://www.securityfocus.com/bid/70261
http://www.openwall.com/lists/oss-security/2014/10/01/29
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.14.2