The patch titled
reparent_thread: don't call kill_orphaned_pgrp() if task_detached()
has been added to the -mm tree. Its filename is
reparent_thread-dont-call-kill_orphaned_pgrp-if-task_detached.patch
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------------------------------------------------------
Subject: reparent_thread: don't call kill_orphaned_pgrp() if task_detached()
From: Oleg Nesterov <oleg@xxxxxxxxxx>
If task_detached(p) == T, then either
a) p is not the main thread, we will find the group leader on the
->children list.
or
b) p is the group leader but its ->exit_state = EXIT_DEAD. This
can only happen when the last sub-thread has died, but in that case
that thread has already called kill_orphaned_pgrp() from
exit_notify().
In both cases kill_orphaned_pgrp() looks bogus.
Move the task_detached() check up and simplify the code, this is also
right from the "common sense" pov: we should do nothing with the detached
childs, except move them to the new parent's ->children list.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/exit.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff -puN kernel/exit.c~reparent_thread-dont-call-kill_orphaned_pgrp-if-task_detached kernel/exit.c
--- a/kernel/exit.c~reparent_thread-dont-call-kill_orphaned_pgrp-if-task_detached
+++ a/kernel/exit.c
@@ -812,6 +812,8 @@ static void reparent_thread(struct task_
list_move_tail(&p->sibling, &p->real_parent->children);
+ if (task_detached(p))
+ return;
/* If this is a threaded reparent there is no need to
* notify anyone anything has happened.
*/
@@ -819,15 +821,13 @@ static void reparent_thread(struct task_
return;
/* We don't want people slaying init. */
- if (!task_detached(p))
- p->exit_signal = SIGCHLD;
+ p->exit_signal = SIGCHLD;
/* If we'd notified the old parent about this child's death,
* also notify the new parent.
*/
if (!ptrace_reparented(p) &&
- p->exit_state == EXIT_ZOMBIE &&
- !task_detached(p) && thread_group_empty(p))
+ p->exit_state == EXIT_ZOMBIE && thread_group_empty(p))
do_notify_parent(p, p->exit_signal);
kill_orphaned_pgrp(p, father);
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
wait-prevent-exclusive-waiter-starvation.patch
linux-next.patch
pipe_rdwr_fasync-fix-the-error-handling-to-prevent-the-leak-crash.patch
get_mm_hiwater_xxx-trivial-s-define-inline.patch
getrusage-fill-ru_maxrss-value.patch
ptrace-kill-__ptrace_detach-fix-exit_state-check.patch
ptrace-simplify-ptrace_exit-ignoring_children-path.patch
ptrace-reintroduce-__ptrace_detach-as-a-callee-of-ptrace_exit.patch
ptrace-fix-possible-zombie-leak-on-ptrace_detach.patch
reparent_thread-dont-call-kill_orphaned_pgrp-if-task_detached.patch
reparent_thread-fix-the-is-it-traced-check.patch
reparent_thread-fix-a-zombie-leak-if-sbin-init-ignores-sigchld.patch
forget_original_parent-cleanup-ptrace-pathes.patch
kthread-dont-looking-for-a-task-in-create_kthread-2.patch
pids-document-task_pgrp-task_session-is-not-safe-without-tasklist-rcu.patch
pids-document-task_pgrp-task_session-is-not-safe-without-tasklist-rcu-fix.patch
pids-improve-get_task_pid-to-fix-the-unsafe-sys_wait4-task_pgrp.patch
pids-refactor-vnr-nr_ns-helpers-to-make-them-safe.patch
pids-kill-now-unused-signal_struct-__pgrp-__session-and-friends.patch
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