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Date: Tue, 20 Aug 2002 16:36:19 +0200 (CEST)
From: Ingo Molnar <mingo@elte.hu>
Reply-To: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Dave McCracken <dmccr@us.ibm.com>, <linux-kernel@vger.kernel.org>
Subject: Re: [patch] O(1) sys_exit(), threading, scalable-exit-2.5.31-A6
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the attached patch ontop of BK-curr fixes the ptrace wait4() anomaly that
can be observed in any previous Linux kernel i could get my hands at. So
in fact ->ptrace_children, besides being a speedup, also fixed a bug that
couldnt be fixed in any satisfactory way before.

	Ingo

--- linux/kernel/exit.c.orig	Tue Aug 20 16:28:57 2002
+++ linux/kernel/exit.c	Tue Aug 20 16:30:13 2002
@@ -731,7 +731,7 @@
 		tsk = next_thread(tsk);
 	} while (tsk != current);
 	read_unlock(&tasklist_lock);
-	if (flag) {
+	if (flag || !list_empty(&current->ptrace_children)) {
 		retval = 0;
 		if (options & WNOHANG)
 			goto end_wait4;

-
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