linux-kernel - Re: [REGRESSION,STABLE,BISECTED] Hang on resume from standby in 3.1.[56], 3.2-rc*

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Message-ID: <4EF62C45.2080501@msgid.tls.msk.ru>
Date:	Sat, 24 Dec 2011 23:47:17 +0400
From:	Michael Tokarev <mjt@....msk.ru>
To:	Phil Miller <mille121@...inois.edu>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Greg Kroah-Hartman <greg@...ah.com>,
	"stable@...nel.org" <stable@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Venkatesh Pallipadi <venki@...gle.com>
Subject: Re: [REGRESSION,STABLE,BISECTED] Hang on resume from standby in 3.1.[56],
 3.2-rc*

On 24.12.2011 20:51, Phil Miller wrote:
> On Sat, Dec 24, 2011 at 03:09, Michael Tokarev <mjt@....msk.ru> wrote:
>> On 24.12.2011 10:40, Phil Miller wrote:
>>> On Fri, Dec 23, 2011 at 11:31, Phil Miller <mille121@...inois.edu> wrote:
>>>> I've got a Dell Precision T1500 (lspci, dmidecode, and dmesg output at
>>>> http://charm.cs.uiuc.edu/~phil/linux-suspend-hang/ ) that I generally
>>>> suspend when I'm out of the house or asleep, and wake up when I want
>>>> to use it. Sadly, a recent change to the kernel has disrupted that
>>>> happy state of affairs. When I run the most recent stable or
[]
>> I  noticed that my host also stopped resuming with 3.1, and noted that
>> with 3.1.3 it works ok.  I'm now trying to revert this commit too, to
>> see if that's the problem.

Actually that wasn't the issue.  After several iterations (which took
some time) I found out that I can't reproduce the hangs which I were
able to trigger trivially just yesterday.  I can only guess these hangs
were due to some other software components (gnome, X stuff, whatever)
which happened to be upgraded today too, together with the kernel, and
the problem went away.  I booted into kernel with which the system
definitely had the issue at hand (3.1.3), but it resumes from suspend
(both s2ram and s2disk) without any issue whatsoever, I did several
resumes of each kind in a row, intermixed them together.

> I first noticed this using Debian unstable's packaged kernels, which
> call themselves 3.x.0, but actually get revved through the stable
> versions 3.x.y (I'll probably complain about that misnaming to them).
> The upgrade from 3.1.4 to 3.1.5 is where it broke, matching the
> bisection's results.

So it looks like not all systems suffer from this issue...

Please excuse me for the noize -- it really looked like the kernel
broke.

Thanks,

/mjt
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