My linux server recently crashed during the commit upload of a very
large subversion repository (300MB of source code) over http with
mod_dav_svn. The server crashed because memory use suddenly expanded
exponentially and I am certain that the subversion application caused
the spike in memory usage and the resulting crash. I am running version
1.6.6 (r40053) of subversion and mod_dav_svn on a CentOS 5.4 server.
You can view a graph of the memory usage of my server during this event at:
http://dickens.com/images/svn-memory-crash.png
You can see the memory consumption start to increase at approximately
5:30PM and the machine subsequently ran out of memory, seized up and
crashed at approximately 6:00PM. The memory consumption on this graph
coincides exactly with the commit of a very large subversion repository
over http using mod_dav_svn. FWIW, the commit upload was from a slow
(500KB upload speed) DSL connection.
So, my questions are:
1) Is there a problem in Subversion 1.6.6 that can cause all available
system memory to be consumed during a large commit upload over httpd
using mod_dav_svn resulting in a crash? Is this a known bug in Subversion
1.6.6? I have found references to this bug in earlier versions but I
cannot find any reference to this in version 1.6.6.
2) If this problem does indeed still exist then what is the recommended
fix for this bug, band-aids or otherwise? How do I protect my server
from this happening again?
3) Is the following exploit, that takes advantage of this bug in earlier
versions of subversion, still a problem for version 1.6.6?:
http://subversion.tigris.org/ds/viewMessage.do?dsForumId=1065&viewType=browseAll&dsMessageId=2358435#messagefocus
Many thanks for any replies,
Gordon Dickens
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Received on 2009-11-09 18:52:07 CET
