linux-kernel - Re: [PATCH] shm: fix a race between shm_exit() and shm

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Message-ID: <20110803131323.GC2773@nautilus.holoscopio.com>
Date:	Wed, 3 Aug 2011 10:13:24 -0300
From:	Thadeu Lima de Souza Cascardo <cascardo@...aslivre.org>
To:	linux-kernel@...r.kernel.org
Cc:	marc.zyngier@....com, manuel.lauss@...glemail.com,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	segoon@...nwall.com, richard@....at, gregkh@...e.de,
	kay.sievers@...y.org
Subject: Re: [PATCH] shm: fix a race between shm_exit() and shm_init()

As Marc Zyngier has pointed out, the culprit is driver_init, which
calls devices_init. I'd say other calls from driver_init also call into
kset and kobject, which will dispatch uevent helper.

I tried to reproduce the problem using UML and only was successful after
setting CONFIG_UEVENT_HELPER_PATH. I guess we could obsolete this
feature and plan its removal soon. Is anybody still using this?

Regards,
Cascardo.

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