The inode double locking code in fs/ocfs2/file.c in the Linux kernel 2.6.30 before 2.6.30-rc3, 2.6.27 before 2.6.27.24, 2.6.29 before 2.6.29.4, and possibly other versions down to 2.6.19 allows local users to cause a denial of service (prevention of file creation and removal) via a series of splice system calls that trigger a deadlock between the generic_file_splice_write, splice_from_pipe, and ocfs2_file_splice_write functions.
http://www.ubuntu.com/usn/usn-793-1
http://www.openwall.com/lists/oss-security/2009/05/29/2
http://www.debian.org/security/2009/dsa-1844
http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2009-06/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2009-06/msg00000.html