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Re: Metadata CRC error upon unclean unmount

To: Fanael Linithien <fanael4@xxxxxxxxx>
Subject: Re: Metadata CRC error upon unclean unmount
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Tue, 24 Jun 2014 13:48:15 -0500
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <CA+o=1OXJZk2XjZhtEORQesDjb3VGzM1Ddk6DGXwuLhHJUEbjPQ@xxxxxxxxxxxxxx>
References: <CA+o=1OW0OXhzU+b9ACMZzg0dq=B7BSj+yPXD2Vrr9F6mWK8ruQ@xxxxxxxxxxxxxx> <53A9A295.8030302@xxxxxxxxxxx> <CA+o=1OXJZk2XjZhtEORQesDjb3VGzM1Ddk6DGXwuLhHJUEbjPQ@xxxxxxxxxxxxxx>
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On 6/24/14, 11:19 AM, Fanael Linithien wrote:
> 2014-06-24 18:08 GMT+02:00 Eric Sandeen <sandeen@xxxxxxxxxxx>:
>> Do you have any kind of reproducer for this?
> 
> The closest thing to a reliable reproducer I found is:
> dd if=/dev/urandom of=some.file
> <VM reset while dd is still running>
> 
>> Any chance you created an xfs_metadump before the xfs_repair?
> 
> I still have the broken FS, but the dump is 225 MB. Will it be OK if I
> repro it on a clean FS?
> 
>> What constitutes an "unclean unmount" in your case; a VM reset?  A host
>> crash?
> 
> A VM reset.
> 
>> (This is a VM, right?)
> 
> Right.

FWIW, I've been unable to reproduce this in about 4 attempts, using
virtualbox, and doing a guest reset.

-Eric

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