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Subject: Re: svn segfault when using svn+ssh schema
To: cygwin AT cygwin DOT com
References: <a1702beb-ff73-0005-6568-2f113ed1ab77 AT dwalin DOT fsnet DOT co DOT uk> <9a5a8d1d-2b71-522e-59a6-29ad915e2445 AT acm DOT org>
From: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Message-ID: <4aa633a9-96a6-ba7c-e638-314522d98abe@dronecode.org.uk>
Date: Sun, 8 Jan 2017 21:16:13 +0000
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On 08/01/2017 20:45, David Rothenberger wrote:
> On 1/8/2017 6:12 AM, Sam Edge wrote:
[...]
>>
>> I've attached cygcheck & the segfault stackdump.
>>
>> I'm at a loss. Any ideas?
>
> [Cygwin subversion maintainer here.]
>
> Sorry, I have no further ideas. svn+ssh is working fine for me here
> using both Cygwin and Debian as the server. Debian is running Subversion
> 1.8.10.
>
> I personally lack the technical skills to decode the stack trace. Maybe
> someone else can. Alternatively, you could theoretically download the

The script at [1] shows how to do this. Unfortunately...

> $ stackdump2backtrace svn.stackdump
> 0x0000000180053d3f    dll_list::populate_deps(dll*)    dll_init.cc:271
> 0x0000000180053f9a    dll_list::topsort()              dll_init.cc:309
> 0x00000001800ab62d    fork                             fork.cc:597
> 0x000000018011882b    xc                               sigfe.s:43
> 0x00000003fa778644    xc                               ??:0
> 0x00000003ed275773    xc                               ??:0
> 0x00000003ed275e3d    xc                               ??:0
> 0x00000003ed2d41f4    xc                               ??:0
> 0x00000003ed40fc0f    xc                               ??:0
> 0x00000003ed41079e    xc                               ??:0
> 0x00000003ed3f2d59    xc                               ??:0
> 0x00000003ed3f3320    xc                               ??:0
> 0x000000010040b9f9    svn_cl__list                     list-cmd.c:387
> 0x00000001004178fd    sub_main                         svn.c:3042
> 0x000000010041b755    main                             svn.c:3126
> 0x0000000180047902    dll_crt0_1(void*)                dcrt0.cc:1018

... this is a crash in the cygwin DLL.

Also unfortunately, the stackdump doesn't record the DLLs loaded and 
their bases addresses, so we can only guess which one ended up at 
0x00000003e0000000

> subversion debug package and reproduce the error in gdb to get a
> backtrace. Again, my C/gdb skills are rusty, so I can't provide any
> details about how to do that.

So see also [2] and note well the point about 'set cygwin-exceptions on'

[1] https://cygwin.com/ml/cygwin/2015-08/msg00311.html
[2] https://cygwin.com/faq.html#faq.programming.debugging-cygwin


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