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Date: Mon, 9 Sep 2002 22:43:51 +0200 (CEST)
From: Ingo Molnar <mingo@elte.hu>
Reply-To: Ingo Molnar <mingo@elte.hu>
To: Daniel Jacobowitz <dan@debian.org>
Cc: Linus Torvalds <torvalds@transmeta.com>, <linux-kernel@vger.kernel.org>
Subject: Re: do_syslog/__down_trylock lockup in current BK
In-Reply-To: <20020909201516.GA7465@nevyn.them.org>
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the following assert triggers and catches the lockup:

--- linux/kernel/exit.c.orig	Mon Sep  9 21:59:24 2002
+++ linux/kernel/exit.c	Mon Sep  9 22:38:44 2002
@@ -461,6 +461,8 @@
 		ptrace_unlink (p);
 
 		list_del_init(&p->sibling);
+		if (p->parent == father && p->parent == p->real_parent)
+			BUG();
 		p->parent = p->real_parent;
 		list_add_tail(&p->sibling, &p->parent->children);
 	}

so somehow we can end up having parent == real_parent?

	Ingo

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