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Pull ptrace fix from Eric Biederman: "This fixes a brown paper bag bug. When I fixed the ptrace interaction with user namespaces I added a new field ptracer_cred in struct_task and I failed to properly initialize it on fork. This dangling pointer wound up breaking runing setuid applications run from the enlightenment window manager. As this is the worst sort of bug. A regression breaking user space for no good reason let's get this fixed" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: ptrace: Properly initialize ptracer_cred on fork