Pull core dump fix from Al Viro:
"Fix for multithreaded coredump playing fast and loose with getting
registers of secondary threads; if a secondary gets caught in the
middle of exit(2), the conditition it will be stopped in for dumper to
examine might be unusual enough for things to go wrong.
Quite a few architectures are fine with that, but some are not."
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
don't dump the threads that had been already exiting when zapped.