The patch titled
ptrace: wait_task_zombie: do not account traced sub-threads
has been removed from the -mm tree. Its filename was
ptrace-wait_task_zombie-do-not-account-traced-sub-threads.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: ptrace: wait_task_zombie: do not account traced sub-threads
From: Oleg Nesterov <oleg@xxxxxxxxxx>
The bug is ancient.
If we trace the sub-thread of our natural child and this sub-thread exits,
we update parent->signal->cxxx fields. But we should not do this until
the whole thread-group exits, otherwise we account this thread (and all
other live threads) twice.
Add the task_detached() check. No need to check thread_group_empty(),
wait_consider_task()->delay_group_leader() already did this.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Acked-by: Roland McGrath <roland@xxxxxxxxxx>
Cc: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Cc: Vitaly Mayatskikh <vmayatsk@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/exit.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -puN kernel/exit.c~ptrace-wait_task_zombie-do-not-account-traced-sub-threads kernel/exit.c
--- a/kernel/exit.c~ptrace-wait_task_zombie-do-not-account-traced-sub-threads
+++ a/kernel/exit.c
@@ -1197,8 +1197,11 @@ static int wait_task_zombie(struct wait_
}
traced = ptrace_reparented(p);
-
- if (likely(!traced)) {
+ /*
+ * It can be ptraced but not reparented, check
+ * !task_detached() to filter out sub-threads.
+ */
+ if (likely(!traced) && likely(!task_detached(p))) {
struct signal_struct *psig;
struct signal_struct *sig;
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
linux-next.patch
rework-fix-is_single_threaded.patch
getrusage-fill-ru_maxrss-value.patch
getrusage-fill-ru_maxrss-value-update.patch
signals-tracehook_notify_jctl-change.patch
utrace-core.patch
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