mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-12 04:22:27 +01:00
Oleg Nesterov
950bbabb5a
We don't change pid_ns->child_reaper when the main thread of the subnamespace init exits. As Robert Rex <[email protected]> pointed out this is wrong. Yes, the re-parenting itself works correctly, but if the reparented task exits it needs ->parent->nsproxy->pid_ns in do_notify_parent(), and if the main thread is zombie its ->nsproxy was already cleared by exit_task_namespaces(). Introduce the new function, find_new_reaper(), which finds the new ->parent for the re-parenting and changes ->child_reaper if needed. Kill the now unneeded exit_child_reaper(). Also move the changing of ->child_reaper from zap_pid_ns_processes() to find_new_reaper(), this consolidates the games with ->child_reaper and makes it stable under tasklist_lock. Addresses http://bugzilla.kernel.org/show_bug.cgi?id=11391 Reported-by: Robert Rex <[email protected]> Signed-off-by: Oleg Nesterov <[email protected]> Acked-by: Serge Hallyn <[email protected]> Acked-by: Pavel Emelyanov <[email protected]> Acked-by: Sukadev Bhattiprolu <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>