From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 17 Oct 2007 06:27:23 +0000 (-0700)
Subject: exec: RT sub-thread can livelock and monopolize CPU on exec
X-Git-Tag: v2.6.24-rc1~672
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6db840fa7887980ef68a649640d506fe069eef0c;p=pandora-kernel.git

exec: RT sub-thread can livelock and monopolize CPU on exec

de_thread() yields waiting for ->group_leader to be a zombie. This deadlocks
if an rt-prio execer shares the same cpu with ->group_leader. Change the code
to use ->group_exit_task/notify_count mechanics.

This patch certainly uglifies the code, perhaps someone can suggest something
better.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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