linux-kernel - Re: Machine crashes right *after* ~successful resume

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Date:	Thu, 30 Oct 2014 21:54:46 +0000
From:	Wilmer van der Gaast <wilmer@...st.net>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Machine crashes right *after* ~successful resume

Hello,

On 30-10-14 16:57, Yinghai Lu wrote:
>> Sadly, with that patch (applied against a vanilla 3.17 tree like all the> others) the second resume fails already. :-(
>
> oh, no. Really want to know which bit causes the problem.
>
Good question. And I think you will find my new finding even more 
confusing: With your two patches from this e-mail, I could 
suspend+resume 3× with no problems.. With just your two debugging 
patches applied.

Lovely heisenbug here. I'll add that for every test so far I've removed 
the kernel source tree, re-untarred it and applied the patches from your 
e-mails on that, so the tests should be consistent. As is the bug 
normally, before we started testing patches the crashes were already 
always *very* reliably happening exactly after the third resume.

Just to be sure this morning was not a fluke, I've retested your patch 
from this morning, and still a crash on the second resume.

> Please check debug patch...that will print out pci conf space before
> ...and after...
>
http://gaast.net/~wilmer/.lkml/good3.17-patched-megadebug.txt


Wilmer v/d Gaast.

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