The m_stop function in fs/proc/task_mmu.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (OOPS) via vectors that trigger an m_start error.
https://github.com/torvalds/linux/commit/76597cd31470fa130784c78fadb4dab2e624a723
https://bugzilla.redhat.com/show_bug.cgi?id=747848