svn segfault when using svn+ssh schema
Sam Edge
cygwin@dwalin.fsnet.co.uk
Mon Jan 16 22:22:00 GMT 2017
On 16/01/2017 20:26, Jon Turney wrote:
> On 16/01/2017 20:07, Sam Edge wrote:
>> 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
>>>>>> archive
>>>>>> 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
>>>>>> name
>>>>>> 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.
>
> Not quite, this strace has...
>
>> --- Process 5436 loaded C:\cygwin64\lib\sasl2_3\cygcrammd5-3.dll at
>> 00000003EA090000
>> --- Process 5436, exception c0000005 at 00000003EA023780
>> --- Process 5436 unloaded DLL at 00000003EA090000
>> 333 52465 [main] svn 5436 seterrno_from_win_error:
>> /home/corinna/src/cygwin/cygwin-2.6.1/cygwin-2.6.1-1.x86_64/src/newlib-cygwin/winsup/cygwin/dlfcn.cc:304
>> windows error 998
>> 24 52489 [main] svn 5436 geterrno_from_win_error: windows error
>> 998 == errno 14
>> 20 52509 [main] svn 5436 dlopen: ret 0x0
>
> and then a bit later
>
>> 21 91851 [main] svn 5436 fork: entering
>> 168 92019 [main] svn 5436 sig_send: sendsig 0x80, pid 5436,
>> signal -72, its_me 1
>> 19 92038 [main] svn 5436 sig_send: wakeup 0x28C
>> 24 92062 [main] svn 5436 sig_send: Waiting for pack.wakeup 0x28C
>> 36 92098 [sig] svn 5436 wait_sig: signalling pack.wakeup 0x28C
>> 27 92125 [main] svn 5436 sig_send: returning 0x0 from sending
>> signal -72
>> --- Process 5436, exception c0000005 at 0000000180053D3F
>
> So it looks like perhaps cygcrammd5 is faulting during it's DllMain,
> and perhaps this leaves things in a state that dll_list::topsort can't
> handle...
>
>>> 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.
>>>
>>> BR
>>
>> Hi again.
>>
>> 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
>> so far.
>
> You also need the symbols for the DLL loaded at the faulting address.
>
> From previous information I'd guess that is cyrus-sasl-debuginfo.
>
> (you can check this using gdb's 'info shared' command)
>
>> 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. :-)
>
Hi Jon. Thanks for the swift reply.
I've installed the debug as you suggested but it doesn't shed much light
to me. The attached gdb output doesn't seem any more enlightening. I'm a
little (!) out of my depth I think.
--
Sam Edge
-------------- next part --------------
SamEdge@thor ~
$ gdb svn
GNU gdb (GDB) (Cygwin 7.10.1-1) 7.10.1
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-cygwin".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from svn...Reading symbols from /usr/lib/debug//usr/bin/svn.exe.dbg...done.
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 5372.0x9ec]
[New Thread 5372.0x16c0]
[New Thread 5372.0x1044]
[New Thread 5372.0x1208]
Program received signal SIGSEGV, Segmentation fault.
0x00000003e9f63780 in ?? ()
(gdb) info shared
From To Syms Read Shared Object Library
0x0000000076cb1000 0x0000000076e594e8 Yes (*) /cygdrive/c/Windows/SYSTEM32/ntdll.dll
0x0000000076a91000 0x0000000076baeaf4 Yes (*) /cygdrive/c/Windows/system32/kernel32.dll
0x000007fefcb11000 0x000007fefcb7913c Yes (*) /cygdrive/c/Windows/system32/KERNELBASE.dll
0x00000003ed3d1000 0x00000003ed437020 Yes /usr/bin/cygsvn_client-1-0.dll
0x00000003ed2c1000 0x00000003ed2d301c Yes /usr/bin/cygsvn_ra-1-0.dll
0x00000003ed2b1000 0x00000003ed2bf020 Yes /usr/bin/cygsvn_ra_local-1-0.dll
0x00000003ed221000 0x00000003ed257020 Yes /usr/bin/cygsvn_repos-1-0.dll
0x00000003ed3b1000 0x00000003ed3c101c Yes /usr/bin/cygsvn_fs-1-0.dll
0x00000003ed381000 0x00000003ed3ad020 Yes /usr/bin/cygsvn_fs_base-1-0.dll
0x00000003ed651000 0x00000003ed666020 Yes /usr/bin/cygsvn_delta-1-0.dll
0x00000003ed121000 0x00000003ed21201c Yes /usr/bin/cygsvn_subr-1-0.dll
0x00000003fa761000 0x00000003fa78d018 Yes (*) /usr/bin/cygapr-1-0.dll
0x0000000180041000 0x0000000180610000 Yes /usr/bin/cygwin1.dll
0x00000003ece51000 0x00000003ece5c018 Yes (*) /usr/bin/cyguuid-1.dll
0x00000003eeb21000 0x00000003eeb33018 Yes (*) /usr/bin/cygintl-8.dll
0x00000003f4231000 0x00000003f4334018 Yes (*) /usr/bin/cygiconv-2.dll
0x00000003f4bf1000 0x00000003f4c0901c Yes (*) /usr/bin/cyggcc_s-seh-1.dll
0x00000003fa731000 0x00000003fa75801c Yes (*) /usr/bin/cygaprutil-1-0.dll
0x00000003f53f1000 0x00000003f53fb018 Yes (*) /usr/bin/cygcrypt-0.dll
0x00000003f4c81000 0x00000003f4cab018 Yes (*) /usr/bin/cygexpat-1.dll
0x00000003ed6b1000 0x00000003ed7ab01c Yes (*) /usr/bin/cygsqlite3-0.dll
0x00000003ecca1000 0x00000003eccbc014 Yes (*) /usr/bin/cygz.dll
---Type <return> to continue, or q <return> to quit---
0x000007fefcbc1000 0x000007fefcd2ce4c Yes (*) /cygdrive/c/Windows/system32/CRYPT32.dll
0x000007fefdf11000 0x000007fefdfae4bc Yes (*) /cygdrive/c/Windows/system32/msvcrt.dll
0x000007fefc9e1000 0x000007fefc9ee00c Yes (*) /cygdrive/c/Windows/system32/MSASN1.dll
0x00000003ed621000 0x00000003ed62b020 Yes /usr/bin/cygsvn_fs_util-1-0.dll
0x00000003f4fa1000 0x00000003f5128018 Yes (*) /usr/bin/cygdb-5.3.dll
0x00000003ed331000 0x00000003ed378020 Yes /usr/bin/cygsvn_fs_fs-1-0.dll
0x00000003ed2e1000 0x00000003ed32a01c Yes /usr/bin/cygsvn_fs_x-1-0.dll
0x00000003ed281000 0x00000003ed2af020 Yes /usr/bin/cygsvn_ra_serf-1-0.dll
0x00000003ed7e1000 0x00000003ed7fa1a0 Yes (*) /usr/bin/cygserf-1-0.dll
0x00000003f51b1000 0x00000003f53e601c Yes (*) /usr/bin/cygcrypto-1.0.0.dll
0x00000003f44c1000 0x00000003f4506020 Yes (*) /usr/bin/cyggssapi_krb5-2.dll
0x00000003ee7a1000 0x00000003ee7d401c Yes (*) /usr/bin/cygk5crypto-3.dll
0x00000003ee6d1000 0x00000003ee6df020 Yes (*) /usr/bin/cygkrb5support-0.dll
0x00000003ee6e1000 0x00000003ee79b018 Yes (*) /usr/bin/cygkrb5-3.dll
0x00000003f5401000 0x00000003f540c01c Yes (*) /usr/bin/cygcom_err-2.dll
0x00000003ed5a1000 0x00000003ed60901c Yes (*) /usr/bin/cygssl-1.0.0.dll
0x00000003ed261000 0x00000003ed27f020 Yes /usr/bin/cygsvn_ra_svn-1-0.dll
0x00000003ed801000 0x00000003ed81f018 Yes /usr/bin/cygsasl2-3.dll
0x00000003ed071000 0x00000003ed11901c Yes /usr/bin/cygsvn_wc-1-0.dll
0x00000003ed631000 0x00000003ed64a01c Yes /usr/bin/cygsvn_diff-1-0.dll
0x000007fefdfb1000 0x000007fefe08a624 Yes (*) /cygdrive/c/Windows/system32/advapi32.dll
0x000007fefde41000 0x000007fefde5e39a Yes (*) /cygdrive/c/Windows/SYSTEM32/sechost.dll
0x000007fefd631000 0x000007fefd75c924 Yes (*) /cygdrive/c/Windows/system32/RPCRT4.dll
0x000007fefa9b1000 0x000007fefa9c5034 Yes (*) /cygdrive/c/Windows/system32/netapi32.dll
0x000007fefa9a1000 0x000007fefa9ab01c Yes (*) /cygdrive/c/Windows/system32/netutils.dll
0x000007fefc6f1000 0x000007fefc71265c Yes (*) /cygdrive/c/Windows/system32/srvcli.dll
0x000007fefa981000 0x000007fefa994388 Yes (*) /cygdrive/c/Windows/system32/wkscli.dll
0x000007fefa961000 0x000007fefa973094 Yes (*) /cygdrive/c/Windows/system32/SAMCLI.DLL
0x000007fefb291000 0x000007fefb2ac93c Yes (*) /cygdrive/c/Windows/system32/SAMLIB.dll
0x000007fefc3e1000 0x000007fefc40ec1c Yes (*) /cygdrive/c/Windows/system32/authz.dll
0x000007fef9241000 0x000007fef924b194 Yes (*) /cygdrive/c/Windows/system32/dsrole.dll
0x00000003e9fe1000 0x00000003e9fed01c Yes /usr/lib/sasl2_3/cyganonymous-3.dll
0x00000003e9fd1000 0x00000003e9fdd01c Yes /usr/lib/sasl2_3/cygcrammd5-3.dll
(*): Shared library is missing debugging information.
(gdb) info threads
Id Target Id Frame
4 Thread 5372.0x1208 0x0000000076cfd63a in ntdll!ZwWaitForWorkViaWorkerFactory () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
3 Thread 5372.0x1044 0x0000000076cfc2ea in ntdll!ZwWaitForMultipleObjects () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
2 Thread 5372.0x16c0 0x0000000076cfbd9a in ntdll!ZwReadFile () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
* 1 Thread 5372.0x9ec 0x00000003e9f63780 in ?? ()
(gdb) list
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 "
3101 "Subversion"));
3102 }
3103
3104 return err;
3105 }
3106
3107 return SVN_NO_ERROR;
-------------- next part --------------
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