FAQ: new entry for the APR bug on OS X 10.4

[Bryan Dyck <bd...@mac.com>]

Hi all...

I recently ran into some trouble getting Subversion to work properly  
on OS X 10.4 after I upgraded the box that was serving (via Apache)  
my Subversion repository, and after bouncing it around on the users@  
list, it turned out to be the result of a bug in APR that appeared  
fairly recently when running on OS X 10.4. While the bug has been  
fixed in the latest APR sources, that is unusable with any stable  
version of Apache (unless you choose to run the 2.1.x line), and thus  
isn't really much of an option for those who don't feel comfortable  
serving their repos on bleeding-edge code.

As a result of my experience, Karl asked if I would be willing to  
submit a FAQ entry on the issue as it isn't currently addressed, so  
without further ado, here's what I've written:


Question:

I am getting occasional and seemingly inconsistent errors while  
trying to check out over HTTP from a Subversion repository running on  
Mac OS X 10.4 (Tiger). Why?

Answer:

Note: It is assumed that your repository is being served by Apache  
2.0.x.

There is a bug in APR-0.9.6 that is present when it is running on  
Tiger, and shows up when you attempt to check out a file larger than  
64K in size. The resulting check out fails, often with different  
error messages such as (the specifics of each message may differ  
somewhat):

svn: Invalid diff stream: [tgt] insn 1 starts beyond the target view  
position

svn: Unexpected end of svndiff input

svn: REPORT request failed on '/path/to/repository'
svn: REPORT of '/path/to/repository/!svn/vcc/default': Chunk  
delimiter was invalid

and / or errors in your Apache error log like

[error] Provider encountered an error while streaming a REPORT  
response.  [500, #0]
[error] A failure occurred while driving the update report editor   
[500, #190004]

To confirm the presence of this bug - assuming you have access to the  
machine that the repository is being served from - try running a  
check out using a file:// URL, which will access the filesystem  
directly instead of going through Apache. If the resulting check out  
completes successfully, then it is almost certain that this is the  
problem.

Currently, the best solution is to rebuild Apache and Subversion from  
their respective sources, setting the following environment variable  
before running configure for Apache:

setenv ac_cv_func_poll no

If you built APR / APR-Util separately (ie. you did not use the ones  
that come as part of the Apache tarball), you must set the  
environment variable before running configure for APR, as this is  
where the problem lies.


This goes without saying, but please nitpick away, and thanks for the  
opportunity to make a very tiny contribution as well.

Cheers,
Bryan

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Re: FAQ: new entry for the APR bug on OS X 10.4

[kf...@collab.net]

Bryan Dyck <bd...@mac.com> writes:
> I recently ran into some trouble getting Subversion to work properly
> on OS X 10.4 after I upgraded the box that was serving (via Apache)
> my Subversion repository, and after bouncing it around on the users@
> list, it turned out to be the result of a bug in APR that appeared
> fairly recently when running on OS X 10.4. While the bug has been
> fixed in the latest APR sources, that is unusable with any stable
> version of Apache (unless you choose to run the 2.1.x line), and thus
> isn't really much of an option for those who don't feel comfortable
> serving their repos on bleeding-edge code.
> 
> As a result of my experience, Karl asked if I would be willing to
> submit a FAQ entry on the issue as it isn't currently addressed, so
> without further ado, here's what I've written:

Thank you!  Committed in r15182.  It should show up on the live web
site within an hour.

For future reference, the easiest format for us is if you send a
patch; see http://subversion.tigris.org/mailing-list-guidelines.html#patches
for more about that.

Best,
-Karl

> Question:
> 
> I am getting occasional and seemingly inconsistent errors while
> trying to check out over HTTP from a Subversion repository running on
> Mac OS X 10.4 (Tiger). Why?
> 
> Answer:
> 
> Note: It is assumed that your repository is being served by Apache
> 2.0.x.
> 
> There is a bug in APR-0.9.6 that is present when it is running on
> Tiger, and shows up when you attempt to check out a file larger than
> 64K in size. The resulting check out fails, often with different
> error messages such as (the specifics of each message may differ
> somewhat):
> 
> svn: Invalid diff stream: [tgt] insn 1 starts beyond the target view
> position
> 
> svn: Unexpected end of svndiff input
> 
> svn: REPORT request failed on '/path/to/repository'
> svn: REPORT of '/path/to/repository/!svn/vcc/default': Chunk
> delimiter was invalid
> 
> and / or errors in your Apache error log like
> 
> [error] Provider encountered an error while streaming a REPORT
> response.  [500, #0]
> [error] A failure occurred while driving the update report editor
> [500, #190004]
> 
> To confirm the presence of this bug - assuming you have access to the
> machine that the repository is being served from - try running a
> check out using a file:// URL, which will access the filesystem
> directly instead of going through Apache. If the resulting check out
> completes successfully, then it is almost certain that this is the
> problem.
> 
> Currently, the best solution is to rebuild Apache and Subversion from
> their respective sources, setting the following environment variable
> before running configure for Apache:
> 
> setenv ac_cv_func_poll no
> 
> If you built APR / APR-Util separately (ie. you did not use the ones
> that come as part of the Apache tarball), you must set the
> environment variable before running configure for APR, as this is
> where the problem lies.
> 
> 
> This goes without saying, but please nitpick away, and thanks for the
> opportunity to make a very tiny contribution as well.
> 
> Cheers,
> Bryan
> 
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> To unsubscribe, e-mail: dev-unsubscribe@subversion.tigris.org
> For additional commands, e-mail: dev-help@subversion.tigris.org

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