linux-kernel - Re: [PATCH] reboot: disable usermodehelper to prevent fs access

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Date:	Thu, 5 May 2011 13:27:58 -0700
From:	Greg KH <greg@...ah.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] reboot: disable usermodehelper to prevent fs access

On Thu, May 05, 2011 at 01:32:05PM +0200, Kay Sievers wrote:
> From: Kay Sievers <kay.sievers@...y.org>
> Subject: [PATCH] reboot: disable usermodehelper to prevent fs access
> 
> In case CONFIG_UEVENT_HELPER_PATH is not set to "", which it
> should be on every system, the kernel forks processes during
> shutdown, which try to access the rootfs, even when the
> binary does not exist. It causes exceptions and long delays in
> the disk driver, which gets read requests at the time it tries
> to shut down the disk.
> 
> This patch disables all kernel-forked processes during reboot to
> allow a clean poweroff.

Should this also be backported to the -stable kernels as people are
hitting this problem already today, right?

thanks,

greg k-h
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