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Re: XFS crashes on VMs

To: Eric Sandeen <sandeen@xxxxxxxxxxx>
Subject: Re: XFS crashes on VMs
From: Shrinand Javadekar <shrinand@xxxxxxxxxxxxxx>
Date: Wed, 27 May 2015 17:03:47 -0700
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <8BF495B8-F444-415A-B7BF-5E1961C75817@xxxxxxxxxxx>
References: <CABppvi4FZKTsu22uk6nOSaShJOUyWg7cO6h-i4YekF4MLKH8RQ@xxxxxxxxxxxxxx> <8BF495B8-F444-415A-B7BF-5E1961C75817@xxxxxxxxxxx>
Thanks Eric,

We ran xfs_repair and were able to get it back into a running state.
This is fine for a test & dev but in production it won't be
acceptable. What other data do we need to get to the bottom of this?

On Wed, May 27, 2015 at 4:27 PM, Eric Sandeen <sandeen@xxxxxxxxxxx> wrote:
> That's not a crash. That is xfs detecting on disk corruption which likely 
> happened at some time prior. You should unmount and run xfs_repair, possibly 
> with ân first if you would like to do a dry run to see what it might do.  If 
> you get fresh corruption after a full repair, then that becomes more 
> interesting. It's possible that you have a problem with the underlying block 
> layer or it's possible that it is an xfs bug -  but I think this is not 
> something that we have seen before.
> Eric
>> On May 27, 2015, at 6:06 PM, Shrinand Javadekar <shrinand@xxxxxxxxxxxxxx> 
>> wrote:
>> Hi,
>> I am running Openstack Swift in a VM with XFS as the underlying
>> filesystem. This is generating a metadata heavy workload on XFS.
>> Essentially, it is creating a new directory and a new file (256KB) in
>> that directory. This file has extended attributes of size 243 bytes.
>> I am seeing the following two crashes of the machine:
>> http://pastie.org/pastes/10210974/text?key=xdmfvaocvawnyfmkb06zg
>> AND
>> http://pastie.org/pastes/10210975/text?key=rkiljsdaucrk7frprzgqq
>> I have only seen these when running in a VM. We have run several tests
>> on physical server but have never seen these problems.
>> Are there any known issues with XFS running on VMs?
>> Thanks in advance.
>> -Shri
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