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Re: XFS appears to cause strange hang with md raid1 on reboot

To: Tom <storm9c1@xxxxxxxxxxxx>
Subject: Re: XFS appears to cause strange hang with md raid1 on reboot
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Tue, 29 Jan 2013 15:55:16 -0600
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20821.192.104.24.222.1359496079.squirrel@xxxxxxxxxxxxxxxxxxx>
References: <32271.192.104.24.222.1359415698.squirrel@xxxxxxxxxxxxxxxxxxx> <5107124E.70607@xxxxxxxxxxx> <20821.192.104.24.222.1359496079.squirrel@xxxxxxxxxxxxxxxxxxx>
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On 1/29/13 3:47 PM, Tom wrote:
> In a previous message, Eric Sandeen wrote:

...

>> I don't see anything obvious between the two kernels you mention, and I
>> can't spend a ton of time digging into this, since most of my day is
>> taken up supporting the RHEL customers who pay my salary, nudge nudge.
>> ;)
> 
> Any help is appreciated.  Finding this bug may possibly help
> ferret out another more possibly nefarious bug, which is why I don't
> need instant gratification here.  I'm only looking to assist with the
> solution, not cause more stress.
> 
> The "company" that I work for from 9-5 has an extensive RHEL 5.X and 6.X
> deployment with Satellite, channels, full support, the whole nine yards.
> They don't color outside the lines as I do -- they use ext3 for the root
> filesystem instead.  Their loss.  :-)
> 
> So don't worry, said "company" "gives" plenty to the "cause".  ;-)
> 
> However, after 5pm, I do unrelated personal work and projects unrelated
> to said "company", and one of those things is working with CentOS and
> Ubuntu.  Using XFS quite extensively.

Sorry for hassling you ;)

>>
>> I'd look at the kernel changelogs for xfs & md, and see if anything
>> seems plausible.  Maybe diff the sources & see what changed, etc.
>>
> 
> Yeah, I took a half-hearted look already.  But didn't diff any source
> code yet.  I saw a freeze/thaw change and a few other md changes that
> were suspect.  But haven't had a chance to dig deeper.

I'd suspect the md changes were the trigger, though maybe it reveals
an xfs problem.  I don't see anything in xfs that changed which should
be causing this.

The backtrace will help, I think.

Thanks,
-Eric

> Thanks again.
> 
> -- Tom
> 
> 
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