Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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.

Author: torvalds

kernel/exit.c

@@ -454,7 +454,10 @@ static void exit_mm(void)
 		mmap_read_unlock(mm);
 
 		self.task = current;
-		self.next = xchg(&core_state->dumper.next, &self);
+		if (self.task->flags & PF_SIGNALED)
+			self.next = xchg(&core_state->dumper.next, &self);
+		else
+			self.task = NULL;
 		/*
 		 * Implies mb(), the result of xchg() must be visible
 		 * to core_state->dumper.