linux-kernel - Re: -stable commit 87cc4d1e (bisected) causes system freeze

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Date:	Wed, 13 Jul 2011 14:42:50 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Stratos Psomadakis <psomas@...too.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	David Woodhouse <David.Woodhouse@...el.com>, kernel@...too.org
Subject: Re: -stable commit 87cc4d1e (bisected) causes system freeze

* Stratos Psomadakis (psomas@...too.org) wrote:
> On 13/07/2011 09:55 μμ, Stratos Psomadakis wrote:
> > On 13/07/2011 05:28 μμ, Marcus Becker wrote:
> >> Hi,
> >>
> >> With the upgrade to 2.6.39.2, I cannot copy more than ~1GB of data
> >> over the network before my input devices lock up.
> >> Example:
> >> use scp on tty1 to copy a folder or file larger than 3GB over my
> >> gigabit network and after ~1min the keyboard stops responding.
> >> use cp on tty1 with an nfs-3 share mounted over the same network and
> >> try to copy the same file, same happens
> >>
> >> I can hit ctrl+c for about 20-30 sec and eventually get an interrupt
> >> that stops the copying, then the input devices slowly gain control
> >> again. If I do the same on X, there is no chance to get in between and
> >> I have to use SysRq to reboot.
> >>
> >> In our bug report at https://bugs.gentoo.org/show_bug.cgi?id=373109
> >> We did a bisect between 2.6.39.1 and 2.6.39.2 and found the following
> >> patch is causing this problem:
> >>
> >> commit 87cc4d1e3e05af38c7c51323a3d86fe2572ab033
> >> Author: Chris Wright <chrisw@...s-sol.org>
> >> Date:   Sat May 28 13:15:04 2011 -0500
> >>
> >>     intel-iommu: Dont cache iova above 32bit
> >>
> >> I will also attach dmesg, current kernel config, and my bisect log (I
> >> put a uname -a into the log after each bisect) plus git bisect log
> >>
> >> Please let me know if you need more information.
> >>
> >> Thanks,
> >>
> >> Marcus
> > CC'ed the people who signed-off the patch.
> >
> Bug #39312 [1] at b.k.o
> 
> [1] https://bugzilla.kernel.org/show_bug.cgi?id=39312

Thanks for the cc, looking into it.  Would be useful to get details of
the boxes that are showing the issue (full dmesg from boot and lspci).
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