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Re: svnserve hang on SMP

From: root <ebay_101011_0x2b_at_yahoo.com>
Date: 2004-01-27 21:18:31 CET

One further piece of information. I tried running the
stress test stress.pl on this repository.

The result was as follows:

...huge list of all the files it checked out...

Checked out revision 22.
Malformed UTF-8 character (unexpected end of string)
at ./stress.pl line 254, <FOO> line 9067.

...last line repeated multiple times, then...

Segmentation fault

However, I can't seem to find any core files that
relate to subversion -- a search of the entire
filesystems produces only:

/dev/core
/proc/sys/net/core
/usr/lib/gcc-lib/i386-redhat-linux/3.2.2/include/gnu/gcj/protocol/core
/usr/src/linux-2.4.20-28.9/net/core
/opt/j2sdk_nb/jwsdp-1.3/docs/api/javax/servlet/jsp/jstl/core

--- root <ebay_101011_0x2b@yahoo.com> wrote:
> Hi,
>
> I have been trying to track down this problem for
> weeks.
>
> Problem: On a large repository with mostly binary
> files, doing a checkout from a network client will
> hang in the middle of the checkot. This happens
> using
> svn:// svn+ssh:// and https:// (regardless of
> protocol). This does not happen with file:///
>
> The server is the following:
>
> Linux kafka.localdomain 2.4.20-28.9smp #1 SMP Thu
> Dec
> 18 13:37:36 EST 2003 i686 i686 i386 GNU/Linux
> (RedHat
> 9)
>
> svn, version 0.36.0 (dev build)
> compiled Jan 23 2004, 09:46:28
>
> The following repository access (RA) modules are
> available:
>
> * ra_dav : Module for accessing a repository via
> WebDAV (DeltaV) protocol.
> - handles 'http' schema
> * ra_local : Module for accessing a repository on
> local disk.
> - handles 'file' schema
> * ra_svn : Module for accessing a repository using
> the
> svn network protocol.
> - handles 'svn' schema
>
> apr-0.9.4-0.1
> apr-util-0.9.4-0.1
> berkeley-db-4.2.52
> neon-0.24.3-1
> openssl-0.9.7a-20
> zlib-1.1.4-8
>
> The client is the following (note problem occurs
> with
> svn cmd line tools also):
>
> TortoiseSVN 0.24.0, Build 554, UNICODE
> Subversion 0.35.1, dev build
> apr 0.9.5
> apr-iconv 0.9.5
> apr-utils 0.9.5
> berkeley db 4.2.52
> neon 0.24
> OpenSSL 0.9.7c 30 Sep 2003
> zlib 1.2.1
>
> I have compiled subversion with
> --enable-maintainer-mode. When the problem occurs
> (hang) there is no output to stdout. I do not
> believe
> that this is a permissions problem. I have a
> wrapper
> script that sets umask on svnserve binary. I am the
> only one accessing this repository. When it hangs,
> the steps I take are:
>
> Kill the client; see that the svnserve process exits
> successfully on the server via ps command.
>
> svnadmin recover..
>
> fix the permissions, if necessary.
>
> From the client, do an update, it will start
> continuing where it left off, but again it will hang
> half-way through.
>
> I tried to run svnserve -d and then attach gdb to
> the
> process.
>
> Unfortunately, I'm not that familiar with the code,
> and I really don't know where to set breakpoints to
> see anything useful. I am hoping someone on this
> list
> can help me track it down by making suggestions on
> where to look in gdb. If I just do:
>
> (gdb) continue
>
> It runs - and my client connects, and then it hangs
> as
> usual through a checkout (typically after
> downloading
> a number of repository files first)...then I have to
> CTRL-C in gdb, and if I do
>
> (gdb) backtrace
> #0 0xffffe002 in ?? ()
> #1 0x0804aca7 in main (argc=2, argv=0xbfffef84) at
> subversion/svnserve/main.c:353
> #2 0x42015704 in __libc_start_main () from
> /lib/tls/libc.so.6
>
> Which doesn't seem to useful. Not being an expert
> with gdb, or the source code, can someone tell me
> where some useful places would be to place
> breakpoints
> to try to narrow down where it is getting stuck?
>
> With an SMP machine and also the fact that it seems
> the subversion code uses threads, any help is
> appreciated in tracking down this issue.
>
> Thanks in advance,
> Davis
>
>
>
>
>
>
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>
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Received on Tue Jan 27 21:20:37 2004

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