[svn.haxx.se] · SVN Dev · SVN Users · SVN Org · TSVN Dev · TSVN Users · Subclipse Dev · Subclipse Users · this month's index

Re: Breakage on trunk?

From: Stefan Fuhrmann <eqfox_at_web.de>
Date: Sat, 05 Mar 2011 01:56:07 +0100

On 05.03.2011 01:16, John Beranek wrote:
> On 04/03/2011 23:02, Stefan Fuhrmann wrote:
>> On 04.03.2011 12:32, John Beranek wrote:
>>> On 04/03/11 11:18, Philip Martin wrote:
>>>> John Beranek<john_at_redux.org.uk> writes:
>>>>
>>>>> Oh, this is for a run of an installed copy of svnserve, as I don't
>>>>> have a:
>>>>>
>>>>> subversion/tests/libsvn_client/.libs/lt-client-test
>>>>>
>>>>> only:
>>>>>
>>>>> subversion/tests/libsvn_client/client-test
>>>>> [A wrapper script I can't run with gdb]
>>>>>
>>>>> subversion/tests/libsvn_client/.libs/client-test
>>>>> [An executable that doesn't find its libraries]
>>>> Building creates the libtool wrapper scipt client-test and the
>>>> executable .libs/client-tests. The executable is one that will be
>>>> installed and is linked to libraries in the install path.
>>>>
>>>> If you run the libtool wrapper script it creates a second, temporary
>>>> executable .libs/lt-client-test. This is linked to libraries in the
>>>> build directory. This is one you debug.
>>> Oh, I _see_. :)
>>>
>>> #0 0x0000003786c330c5 in raise () from /lib64/libc.so.6
>>> #1 0x0000003786c34a76 in abort () from /lib64/libc.so.6
>>> #2 0x0000003786c2b905 in __assert_fail () from /lib64/libc.so.6
>>> #3 0x00007ffff5b88d0b in svn_temp_deserializer__resolve (
>>> buffer=<value optimized out>, ptr=<value optimized out>)
>>> at subversion/libsvn_subr/svn_temp_serializer.c:282
>>> #4 0x00007ffff6403606 in svn_fs_fs__id_deserialize (
>>> buffer=<value optimized out>, id=0x7912b0)
>>> at subversion/libsvn_fs_fs/id.c:387
>>> #5 0x00007ffff63f4743 in svn_fs_fs__dag_deserialize (out=0x7fffffffd750,
>>> data=0x7912a8 "", data_len=<value optimized out>,
>>> pool=<value optimized out>) at subversion/libsvn_fs_fs/dag.c:1111
>> This is the first call to any de-serializer function
>> right after the raw data has been read cache.
>>
>> So, there is a chance that the data either got
>> corrupted by the cache itself or was garbage
>> even before that. Therefore, I added extensive
>> consistency checks in r1078185 to be able to
>> rule out the cache code itself.
>>
>> Please rebuild with -DDEBUG_CACHE_MEMBUFFER
>> and retry.
> Hmm, appears unchanged with this extra checking/debugging...
>
> John.
That is good news. Assuming that the consistency check
was actually enabled, we can rule out the cache for now.
 From my perspective, this leaves at least two possibilities:

* compiler / optimizer issue
   -> a look at the assembly output should clear that one quickly
* the data gets corrupted during serialization
   -> serializer may need even more assertions()

-- Stefan^2.
Received on 2011-03-05 01:56:31 CET

This is an archived mail posted to the Subversion Dev mailing list.