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Re: SilkSVN client crashing

From: Yuval E. <gyuval_at_gmail.com>
Date: Sun, 13 Oct 2013 01:37:58 -0700 (PDT)

Ivan Zhakov-2 wrote
> On Thu, Sep 12, 2013 at 6:47 PM, Ivan Zhakov &lt;

> ivan@

> &gt; wrote:
>> On Thu, Sep 5, 2013 at 11:37 AM, Bjarne Grönnevik
>> &lt;

> Bjarne.Gronnevik@

> &gt; wrote:
>> [moving to

> dev@.a

> ]
>>> Hi
>>> I’m scripting svn via a Python Script and as you can see in the
>>> run-log.txt,
>>> svn seems to fail at random occasions(see crash logs). Or at least for
>>> reasons unknown to me.
>>> And as the error message suggest helping out by mailing here, I did.
>>> Svn version is: svn, version 1.8.1-SlikSvn-1.8.1-X64 (SlikSvn/1.8.1)
>>> X64,
>>> compiled Aug 26 2013, 16:52:34 on x86_64/x86-microsoft-windows6.1.7601
>>> Os is: Windows 7 Enterprice, 64-bit, Service Pack 1
>> Bert Huijben found very easy way to reproduce this problem:
>> [On Windows]
>> 1. svn log http://svn.apache.org/repos/asf --limit 100 | more
>> 2. Then press 'q'
>> Client crashes.
>> I can reproduce it with trunk and 1.8.x (debug build).
>> The problem that we get ERROR_NO_DATA from fflush() call in
>> svn_cmdline_fflush() when 'more' quits due 'q' key. Then svn_error_t
>> with apr_err = ERROR_NO_DATA passed through layers to serf. For some
>> reason APR_STATUS_IS_EAGAIN(ERROR_NO_DATA) is true, so serf just
>> ignores this error and wait for more data from network. Next chunk
>> received and ra_serf parser called again despite that parser returned
>> error and doesn't expect to be called again. Crash itself happens
>> because it accesses already cleared error, but the real problem that
>> xml parser should not be invoked.
>> There are several problems here:
>> 1. Why APR considers ERROR_NO_DATA as EAGAIN. I've posted question to
>> dev_at_apr mailing list [1]
>> 2. ra_serf passes arbitrary errors to serf, while serf threats APR_EOF
>> and APR_EAGAIN as special value. We should not doing this.
> Filed as issue #4425. Fixed this specific case in r1522892, but
> problem that arbitrary errors are passed to serf from xml parser is
> not fixed yet.
> --
> Ivan Zhakov
> CTO | VisualSVN | http://www.visualsvn.com

I'm experiencing a similar problem with SlikSVN 1.8.3:
svn, version 1.8.3-SlikSvn-1.8.3-WIN32 (SlikSvn/1.8.3) WIN32
   compiled Sep 16 2013, 13:42:00 on x86-microsoft-windows6.1.7601

However, in my case pressing 'q' doesn't crash the client immediately -
instead it just freezes. When I eventually hit Ctrl-C, it crashes.
I get the same results if I pipe into 'head -n 1' instead of 'more'.

Is this likely due to the same root cause as #4425, or should I report it as
a new issue?


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Received on 2013-10-14 07:06:17 CEST

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