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Oleg Nesterov authored
If /sbin/init ignores SIGCHLD and we re-parent a zombie, it is leaked. reparent_thread() does do_notify_parent() which sets ->exit_signal = -1 in this case. This means that nobody except us can reap it, the detached task is not visible to do_wait(). Change reparent_thread() to return a boolean (like __pthread_detach) to indicate that the thread is dead and must be released. Also change forget_original_parent() to add the child to ptrace_dead list in this case. The naming becomes insane, the next patch does the cleanup. Signed-off-by:
Oleg Nesterov <oleg@redhat.com> Cc: Roland McGrath <roland@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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