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Date: Fri, 26 Mar 2010 16:15:40 -0700
From: David Rothenberger <daveroth AT acm DOT org>
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Subject: Re: "svn --version" halts in 1.7.2-2
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On 3/26/2010 2:07 PM, Corinna Vinschen wrote:
> On Mar 26 11:12, David Rothenberger wrote:
>> On 3/26/2010 2:32 AM, Corinna Vinschen wrote:
>>> On Mar 26 15:40, Nayuta Taga wrote:
>>>> "svn --version" hals in 1.7.2-2 on both Windows7 and XP.
>> [snip]
>>>
>>> Works for me.  BLODA?
>>
>> I'm able to reproduce this on one of my three Windows XP machines.
>> Ironically, the only one without a Symantec product installed.
>>
>> On 3/26/2010 4:23 AM, Dave Korn wrote:
>>>   I had mysterious problems with svn once which didn't go away until I got rid
>>> of all the sasl2 stuff from my installation, so this theory is worth pursuing.
>>
>> I recompiled without sasl2 support directly in svn and that fixed the
>> problem for me. This didn't require disabling serf, by the way.
>>
>> I'm not sure why this is hanging on some machines and not others. I see
>> in Process Explorer there's a UDP connection related to sasl2 open when
>> the process is hanging, but I haven't had time to investigate further.
> 
> There's an open UDP connection when calling `svn --version'???

Yup. Here's the thread stack at the time the connection was created:

!connect+0x53
!cygwin_internal+0x2b0d5
!setlogmask+0xce8
!setlogmask+0xdff
!aclcheck+0x11836
!sasl_log+0x123
!sasl_get_plugin+0xa6
!sasl_load_plugins+0x2e3
!sasl_client_init+0xdf
!svn_ra_svn__sasl_init+0x9c
!svn_atomic__init_once+0x49
!svn_ra_svn__sasl_init+0x22
!svn_ra_print_modules+0x5d

The sasl_log thing caused me to check /var/log/messages. Here's what
I found:

Mar 26 15:53:28 localhost unable: to dlopen /usr/lib/sasl2/cygdigestmd5-2.dll: No such file or directory
Mar 26 15:53:28 localhost unable: to dlopen /usr/lib/sasl2/cygotp-2.dll: No such file or directory

Which is weird, because those DLLs are there. So, next I tried an
strace. I noticed that the /usr/lib/sasl2/*.la files were being
opened, which also seemed weird.

So I tried uninstalling libsasl2-devel. It worked! No hang!  This
seems to be the key. The sasl2 initialization appears to hang if the
-devel package is installed, otherwise it works fine.

> I just tested on an up-to-date XP SP3 machine and it also works fine
> there, no hangs.

Works fine for me on all machines without libsasl2-devel. BTW, it
appears Matthias also had the -devel package installed, because his
strace also shows attempts to open the .la files in /usr/lib/sasl2.

-- 
David Rothenberger  ----  daveroth AT acm DOT org

Harriet's Dining Observation:
        In every restaurant, the hardness of the butter pats
        increases in direct proportion to the softness of the bread.

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