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

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Message-ID: <544E235C.5010908@gaast.net>
Date:	Mon, 27 Oct 2014 10:50:04 +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 Yinghai,

Thanks again for your time!

I've applied your two patches, and as a wild guess also added pci=dump 
to my kernel cmdline though I guess that just gave me a boot-time dump - 
which mostly didn't make it into my dmesg.

I accidentally booted with no_console_suspend on the first run, which 
still caused no output at all on the failed resume. I'm including the 
output of that anyway, but also I have a run with that flag removed, and 
annoyingly the crash appears to happen before the dump during the crash 
finishes - while dumping info for this device, it seems:

04:00.0 PCI bridge: Integrated Technology Express, Inc. Device 8892 (rev 
10) (prog-if 01 [Subtractive decode])

(More info in my lspci.txt)

Wondering what device that is exactly, I stumbled upon 
http://sourceforge.net/p/linux1394/mailman/message/29755048/ where 
someone describes it as a "cheap and crappy PCI bridge". More and more I 
wonder if I should just buy a new motherboard - sadly this one wasn't 
even that cheap. :-( Though I don't know if the output stopping while 
dumping output for this device means that it is the culprit, is printk() 
to the serial console in any way blocking/buffered?

Anyway, dumps are in:

http://gaast.net/~wilmer/.lkml/bad3.17-pcidumps-no_console_suspend.txt
http://gaast.net/~wilmer/.lkml/bad3.17-pcidumps.txt

Cheers,

Wilmer van der Gaast.

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