Re: svn segfault when using svn+ssh schema
- Date: Mon, 16 Jan 2017 20:07:35 +0000
- From: Sam Edge <cygwin@xxxxxxxxxxxxxxxxxx>
- Subject: Re: svn segfault when using svn+ssh schema
On 09/01/2017 19:07, Sam Edge wrote:
> On 09/01/2017 02:04, Eliot Moss wrote:
>> On 1/8/2017 3:45 PM, David Rothenberger wrote:
>>> On 1/8/2017 6:12 AM, Sam Edge wrote:
>>>> I've seen a number of 'svn segfault' threads on the mailing list
>>>> but none of them seem to cover this specific failure mode.
>>>> (Apologies if
>>>> one of them does!)
>>>> I'm getting segfaults from svn but only when using ssh as the schema.
>>>> The following three commands are all accessing the same server, the
>>>> of which has been changed to protect the guilty.
>>>> SamEdge@thor ~
>>>> $ ssh cmserver.XXXXXX.com
>>>> ( success ( 2 2 ( ) ( edit-pipeline svndiff1 absent-entries
>>>> commit-revprops depth log-revprops atomic-revprops partial-replay
>>>> inherited-props ephemeral-txnprops file-revs-reverse ) ) )
>>>> SamEdge@thor ~
>>>> $ svn ls svn+ssh://cmserver.XXXXXX.com/edl/
>>>> Segmentation fault (core dumped)
>> Assuming this is repeatable behavior, perhaps getting a trace using
>> strace would reveal some more useful information.
>> Regards - Eliot Moss
> Good idea.
> Strangely, on another Windows 7 64-bit machine svn+ssh to the same
> server is working fine for me. The most significant differences are that
> the 'working' machine is running Windows 7 Pro on an Intel CPU with
> Sophos AV and domain accounts whereas the 'failing' machine is Windows 7
> Home Premium on an AMD with MS Security Essentials and local accounts.
> These differences may or may not be relevant of course.
> Anyway, attached are the two strace outputs. Diffing them suggests that
> it's segfaulting in the fork() "system" call.
> I don't have time in the week to run it in a debug session but I'll try
> to do so at the weekend given the advice I've been given here. I will
> also do a rebaseall after I've tracked down the
> Thanks for the feedback folks. Much appreciated.
I've downloaded the debug symbols for subversion & the Cygwin dll and
run the command in gdb. Output attached. Not really giving me any clues
I've also run 'rebaseall' on the off chance that it would help - it didn't!
Still open to suggestions if anyone has any "light bulb" notions. :-)
$ gdb svn
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Reading symbols from svn...Reading symbols from /usr/lib/debug//usr/bin/svn.exe.dbg...done.
(gdb) set cygwin-exceptions on
(gdb) run ls svn+ssh://cmserver.XXXXXXXXXX.com/edl/
Starting program: /usr/bin/svn ls svn+ssh://cmserver.XXXXXXXXXX.com/edl/
[New Thread 2096.0xf4c]
[New Thread 2096.0x157c]
[New Thread 2096.0x1264]
[New Thread 2096.0x15d8]
Program received signal SIGSEGV, Segmentation fault.
0x00000003e9f63780 in ?? ()
#0 0x00000003e9f63780 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) info threads
Id Target Id Frame
4 Thread 2096.0x15d8 0x0000000076cfd63a in ntdll!ZwWaitForWorkViaWorkerFactory () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
3 Thread 2096.0x1264 0x0000000076cfc2ea in ntdll!ZwWaitForMultipleObjects
() from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
2 Thread 2096.0x157c 0x0000000076cfbd9a in ntdll!ZwReadFile ()
* 1 Thread 2096.0xf4c 0x00000003e9f63780 in ?? ()
3098 err, _("When using svn+ssh:// URLs, keep in mind that the "
3099 "--username and --password options are ignored "
3100 "because authentication is performed by SSH, not "
3104 return err;
3107 return SVN_NO_ERROR;
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