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RE: Issue while loading the SVN Dump SVN version 1.9.7

From: Santosh Kondapuram <SKondapuram_at_vitechinc.com>
Date: Wed, 31 Jan 2018 15:12:57 +0000

Hi Johan,

As you suggested I have removed the leading spaces from line 39 (enable-rep-sharing=false) and this time it worked and was able to successfully load the problematic revision.
So does this conclude I have the sha-1 colliding files in my repo ? Also what are the next steps to catchup the latest revisions from the master node ?
Appreciate all your help and great working with you on this issue !!!


By the way I have tried running the following command " svnadmin load -M 0 /u01/svn/repos < incdump724413.txt "with rep-sharing enabled and still see the same issue. I have tried doing this before the above work around which worked.


-----Original Message-----
From: Johan Corveleyn [mailto:jcorvel_at_gmail.com]
Sent: Wednesday, January 31, 2018 8:59 AM
To: Santosh Kondapuram <SKondapuram_at_vitechinc.com>
Cc: users_at_subversion.apache.org
Subject: Re: Issue while loading the SVN Dump SVN version 1.9.7

On Wed, Jan 31, 2018 at 2:44 PM, Johan Corveleyn <jcorvel_at_gmail.com> wrote:
> On Wed, Jan 31, 2018 at 9:28 AM, Santosh Kondapuram
> <SKondapuram_at_vitechinc.com> wrote:
>> Hi Johan,
>> Sorry for the delayed response as I was in long vacation.
>> Yes, I don’t think we are hitting the real sha-1 collision in our repository and as you said it might be another bug in the sha-1 collision detection code.
>> I am sure that no one committed the sha-1-colliding files from
>> https://shattered.io Our repository is very huge with 1 Million + revisions and I am seeing the issue only while loading the specific revision 724413. I am able to load the revisions before and after it.
>> As you suggested I have now loaded the dump till 724412 which is the revision before the problematic one with rep sharing enabled.
>> It's not allowing me to load the problematic revision with rep-sharing disabled and getting below message.
>> FYI,
>> [root_at_vitech-svn-slave-test-01 svndump]# svnadmin load /u01/svn/repos
>> < incdump724413.txt
>> svnadmin: E200002: Error while parsing config file: /u01/svn/repos/db/fsfs.conf:
>> svnadmin: E200002: line 39: Option expected
> Hm, that indicates that there was a syntax error on line 39 in the
> db/fsfs.conf file you edited (when you were trying to disable
> rep-sharing). Can you take another look and try again with rep-sharing
> disabled? That line in fsfs.conf should be (without leading spaces):
> enable-rep-sharing = false
> Now, I'm not sure what we'll be able to do next to figure this out.
> First step is probably find out which two files are colliding, and
> what their contents is exactly. It's extremely unlikely that there is
> a real sha1 collision, but we have to rule it out I suppose.


Can you double-check that using -M 0 for the 'svnadmin load' operation doesn't solve the problem (while keeping rep-sharing enabled)?

    svnadmin load -M 0 /u01/svn/repos < incdump724413.txt

It's just that this works around the only currently known bug in the sha1-collision-detection code, so I want to be really sure that this workaround doesn't help in your case and we need to look further.

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Received on 2018-01-31 16:13:12 CET

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