linux-kernel - Re: [GIT BISECT] first bad commit: 1f36f774 Switch !O_CREAT case to use of do

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Message-ID: <4BAA3828.2070506@panasas.com>
Date:	Wed, 24 Mar 2010 18:04:56 +0200
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	pNFS Mailing List <pnfs@...ux-nfs.org>,
	Benny Halevy <bhalevy@...asas.com>,
	"J. Bruce Fields" <bfields@...i.umich.edu>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [GIT BISECT] first bad commit: 1f36f774 Switch !O_CREAT case
 to use of do_last()

On 03/24/2010 06:00 PM, Al Viro wrote:
> On Wed, Mar 24, 2010 at 05:49:39PM +0200, Boaz Harrosh wrote:
>> - I have an exofs filesystem mounted on /mnt/exofs
>> - []$ cd /mnt/exofs/some_linux_git; git status;
>>   All is fine
>> - []$ mount -t nfs4 -o minorversion=0 localhost:/ /mnt/nfs
>>   (Where etc/exports will export /mnt/exofs via nfs4.1)
>> - []$ cd /mnt/nfs/some_linux_git; git status;
>>   This will fail and will corrupt the .git/index file. Sometimes the file would be
>>   too short, and sometimes the file will become a directory (Yes really)
> 
> Bloody impressive...  Does that happen to underlying fs or to what you
> are seeing via NFS?

Only via NFS. All local access is fine.

After the corruption above I can cd to the local mount cp a fresh copy
of .git/index file and play around just fine.
Once I return to the NFS mounted directory, a git status will do it.
It does not matter if caches are cold (Takes a long time) or hot it happens
every time.

Weird I know, I'm playing some more with it as we speak

Thanks
Boaz
 
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