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Re: svn_client operations start failing - unable to resolve host name

From: Robert Turner <rturner_at_qnx.com>
Date: Tue, 27 Nov 2012 14:33:15 +0000

Thanks for the reply.

So I spent ages digging into this (and related issues) last night, and
that is correct. gethostbyname() is indeed failing, spontaneously it
seems. However, as to why, I don't know yet. I'm suspecting something is
getting messed up in the local memory space that is affecting it. Other
processes do not seem to be affected.

I also tried using 1.7.7 client libraries (which I eventually got to
compile and more or less work from source once I stopped using a custom
built APR and used the one Apple provides on the platform). However, I was
running into stack corruption issues during repeated svn_client_cat2()
calls (the revision was getting overwritten, or the pointer was getting
changed and ended up being the URL string). I haven't yet figured these
issues out, or tried more current code than 1.7.7.

Robert

On 2012-11-27 9:14 AM, "Daniel Shahaf" <d.s_at_daniel.shahaf.name> wrote:

>Robert Turner wrote on Mon, Nov 26, 2012 at 19:49:35 +0000:
>> I'm in the process of making some updates to a FUSE svnfs, and while
>>the process is merrily chugging away pulling file information, it starts
>>getting lots of errors from the svn_client commands (not just the one
>>below, but that's an example):
>>
>> DEBUG : [00] svnclient_cache(): svn_client_cat(), err->message='OPTIONS
>>of '<<<pathname removed>>>': Could not resolve hostname `<<<host name
>>removed>>>': Host not found (<<<host name removed>>>)'
>>err->apr_err=175002,0x2ab9a 'RA layer request failed'
>>
>> There is nothing of note configured related to proxies, or anything. As
>>mentioned above, the operations are performing correctly for a while,
>>then stop, and no further operations succeed until the process exits and
>>is restarted. My process seems to behaving well from a memory
>>perspective, and static analysis tools are coming up clean.
>>
>> I'm suspecting that something is getting confused in the internal state
>>of the SVN client libraries.
>>
>
>And I'm suspecting your C library DNS resolver function is returning an
>error. Have you ruled that out yet?
>
>> Any suggestions on where to look further, or what might be the problem?
>>
>>
>>
>> (I'm using the 1.6.18 client libraries from wanDisco, compiled for OSX
>>-- I have been unable to get locally compiled and working copies of the
>>SVN libraries myself when trying to compile from source, so I have no
>>easy way to debug through the SVN libraries)
>>
>> Thanks for any ideas anyone might have,
>>
>> Robert
Received on 2012-11-27 15:34:06 CET

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