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Re: svn commit: r990537 - /subversion/branches/performance/subversion/libsvn_subr/svn_temp_serializer.c

From: Stefan Fuhrmann <stefanfuhrmann_at_alice-dsl.de>
Date: Wed, 08 Sep 2010 12:00:01 +0200

Johan Corveleyn wrote:
> On Mon, Sep 6, 2010 at 2:10 AM, Stefan Fuhrmann
> <stefanfuhrmann_at_alice-dsl.de> wrote:
>
>> The only way to get closer to understanding the nature of the
>> problem, I've added extensive logging code to the cache.
>> Please run "svnserve -M1000 -d --forground -r ... > svnserve.log",
>> zip the log file after the programm crashed & got terminated and
>> send it to me directly.
>>
>
> Ok, here it is in attachment, zipped together with the .log and .dmp
> files from the crash.
>
> The exact log command I executed was:
> $ svn log svn://localhost/trunk/sourcesEJB/uz/s9server/services/toegang/driver/settings.xml
>
> Cheers,
>
Thanks Johan!

I finally found the problem and it actually was more likely
to hit 32 bit systems then 64 bit ones. The relevant part
from the log is this:

create cache 1 prefix =
fsfs:8d52877e-3a3d-4b59-a976-c8364f526eee/C:/research/svn/experiment/repos/db:RRI
create cache 2 prefix =
fsfs:8d52877e-3a3d-4b59-a976-c8364f526eee/C:/research/svn/experiment/repos/db:DAG
create cache 3 prefix =
fsfs:8d52877e-3a3d-4b59-a976-c8364f526eee/C:/research/svn/experiment/repos/db:DIR
create cache 4 prefix =
fsfs:8d52877e-3a3d-4b59-a976-c8364f526eee/C:/research/svn/experiment/repos/db:PACK-MANIFEST
create cache 5 prefix =
fsfs:8d52877e-3a3d-4b59-a976-c8364f526eee/C:/research/svn/experiment/repos/db:TEXT
create cache 6 prefix =
fsfs:8d52877e-3a3d-4b59-a976-c8364f526eee/C:/research/svn/experiment/repos/db:NODEREVS
get 6: key=P+, Y3 MD5=52408b02cc58866e204010717f31c0ef hash=42680402
(0,257607) not found
set 6: key=P+, Y3 MD5=52408b02cc58866e204010717f31c0ef hash=42680402
(0,257607) 480_at_2113312
get 6: key=P+, Y3 MD5=52408b02cc58866e204010717f31c0ef hash=42680402
(0,257607) 480_at_2113312
get 2: key=2(& /trunk/sourcesEJB/uz/s9server
MD5=52408b029f15368c2de222f27705f679 hash=42680402 (0,257607) 480_at_2113312
<crash>

As you can see, bucket (0,257607) contains a NODEREV
the last get will read it as a DAG node. It only tested the first
4 bytes of the MD5 key hash because the to_find variable
in find_entry has been a local array once and has become a
pointer later on. sizeof(to_find) was now 4 .. 8 instead of 16.

r994956 should fix the problem.

-- Stefan^2.
Received on 2010-09-08 12:00:38 CEST

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