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Date: Wed, 20 Feb 2008 19:18:23 +0300
From: Oleg Nesterov <oleg@tv-sign.ru>
To: Valdis.Kletnieks@vt.edu
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
       Andrew Morton <akpm@linux-foundation.org>, roland@redhat.com,
       linux-kernel@vger.kernel.org, Pavel Emelyanov <xemul@openvz.org>,
       Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: tty && pid problems
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References: <20080215180204.GA4359@tv-sign.ru> <20080215193756.9e5b8205.akpm@linux-foundation.org> <20080216140212.GA1421@tv-sign.ru> <20080217231019.GA83@tv-sign.ru> <m1skzq9a59.fsf@ebiederm.dsl.xmission.com> <23492.1203464394@turing-police.cc.vt.edu>
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(Change the subject, cc Alan)

On 02/19, Valdis.Kletnieks@vt.edu wrote:
>
> On Sun, 17 Feb 2008 21:11:14 MST, Eric W. Biederman said:
> > Oleg Nesterov <oleg@tv-sign.ru> writes:
> > > On 02/16, Oleg Nesterov wrote:
> > >> On 02/15, Andrew Morton wrote:
> > >> > : BUG: unable to handle kernel paging request at 0000000000200200
> 
> > >> > : Call Trace:
> > >> > :  [<ffffffff80237727>] ? release_task+0x152/0x2e5
> > >> > :  [<ffffffff80237f81>] ? do_wait+0x6c7/0xa1c
> > >> > :  [<ffffffff8022f4cc>] ? default_wake_function+0x0/0xe
> > >> > :  [<ffffffff8023e670>] ? sys_rt_sigaction+0x7a/0x98
> > >> > :  [<ffffffff80238360>] ? sys_wait4+0x8a/0xa1
> > >> > :  [<ffffffff8020be4b>] ? system_call_after_swapgs+0x7b/0x80
> 
> > Thanks.  Looks like we need to grab a lock there.
> > At a quick skim I think we need the tty lock.
> 
> *ping* - Any further activity on this one?  I got bit by it as well on
> the very first attempted boot of 25-rc2-mm1, the instant it tried to leave
> single-user and go multi-user.

Valdis, any chance you can try the
	"[PATCH] (for -mm only) put_pid: make sure we don't free the live pid"
I sent? just to make sure we don't have other problems here.

Oleg.

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