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Date: Mon, 10 Jan 2011 19:43:04 +0100
From: Oleg Nesterov <oleg@redhat.com>
To: Greg KH <gregkh@suse.de>
Cc: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>,
        Kay Sievers <kay.sievers@vrfy.org>,
        Dhaval Giani <dhaval@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org,
        Mike Galbraith <efault@gmx.de>
Subject: Re: [BUG stable, 2.6.32.27] sched: delayed cleanup of user_struct
Message-ID: <20110110184303.GA12393@redhat.com>
References: <4D2AB8F7.7030506@profihost.ag> <20110110114913.GA22298@redhat.com> <20110110123630.GA27057@redhat.com> <4D2AFFB5.5000807@profihost.ag> <20110110133545.GA30163@redhat.com> <4D2B113A.2060303@profihost.ag> <20110110140817.GA31708@redhat.com> <4D2B1658.20201@profihost.ag> <20110110182317.GA16694@suse.de>
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On 01/10, Greg KH wrote:
>
> Tell us about what?  I'm totally confused here, what is the problem?

Please look at http://marc.info/?l=linux-kernel&m=129466345327931

I think that free_user's delayed logic is buggy, and the traces
from Stefan seems to confirm the theory.

As Mike suggests, we can just remove the deprecated USER_SCHED
code and forget about this problem.

Oleg.