Indexing never finishes

The indexing for one repository (out of 60) never finishes. Also, that repo can't be "stopped" from the admin interface.
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The admin repo list for the one stuck repo shows:

Creating changeset 2 - processing addition branches/lgc/port/doc/ldap/netscape/ldap/ber/stream/BERBitString.html
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The errorlog says:

2010-10-21 01:15:27,129 ERROR [InitialPinger7] fisheye.app com.cenqua.fisheye.rep.RepositoryScanner-slurp - Problem processing revisions from repo http://prowess.src.lgc.com/svn/prowess/ due to class com.cenqua.fisheye.rep.RepositoryClientException - org.tigris.subversion.javahl.ClientException: svn: PROPFIND of '/svn/prowess/!svn/vcc/default': 500 Internal Server Error (http://prowess.src.lgc.com)
com.cenqua.fisheye.rep.RepositoryClientException: org.tigris.subversion.javahl.ClientException: svn: PROPFIND of '/svn/prowess/!svn/vcc/default': 500 Internal Server Error (http://prowess.src.lgc.com)
at com.cenqua.fisheye.svn.SvnThrottledClient.revProperties(SvnThrottledClient.java:288)
at com.cenqua.fisheye.svn.SvnRepositoryScanner.slurpRevisionBlock(SvnRepositoryScanner.java:427)
at com.cenqua.fisheye.rep.RepositoryScanner.processRevisions(RepositoryScanner.java:420)
at com.cenqua.fisheye.rep.RepositoryScanner.slurpRepository(RepositoryScanner.java:294)
at com.cenqua.fisheye.rep.RepositoryScanner.slurp(RepositoryScanner.java:203)
at com.cenqua.fisheye.rep.RepositoryScanner.ping(RepositoryScanner.java:131)
at com.cenqua.fisheye.svn.SvnRepositoryEngine.doSlurp(SvnRepositoryEngine.java:74)
at com.cenqua.fisheye.rep.RepositoryEngine.slurp(RepositoryEngine.java:353)
at com.cenqua.fisheye.rep.ping.OneOffPingRequest.doRequest(OneOffPingRequest.java:28)
at com.cenqua.fisheye.rep.ping.PingRequest.process(PingRequest.java:90)
at com.cenqua.fisheye.rep.RepositoryHandle.processPingRequests(RepositoryHandle.java:126)
at com.cenqua.fisheye.rep.RepositoryHandle.queuePingRequest(RepositoryHandle.java:116)
at com.cenqua.fisheye.rep.ping.PingRequest.run(PingRequest.java:57)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: org.tigris.subversion.javahl.ClientException: svn: PROPFIND of '/svn/prowess/!svn/vcc/default': 500 Internal Server Error (http://prowess.src.lgc.com)
at org.tigris.subversion.javahl.JavaHLObjectFactory.throwException(JavaHLObjectFactory.java:777)
at org.tmatesoft.svn.core.javahl.SVNClientImpl.throwException(SVNClientImpl.java:1850)
at org.tmatesoft.svn.core.javahl.SVNClientImpl.revProperties(SVNClientImpl.java:1354)
at org.tigris.subversion.javahl.SVNClient.revProperties(SVNClient.java:271)
at com.cenqua.fisheye.svn.SvnThrottledClient.revProperties(SvnThrottledClient.java:286)
... 15 more
Caused by: org.tmatesoft.svn.core.SVNException: svn: PROPFIND of '/svn/prowess/!svn/vcc/default': 500 Internal Server Error (http://prowess.src.lgc.com)
at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:64)
at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:51)
at org.tmatesoft.svn.core.internal.io.dav.DAVUtil.getResourceProperties(DAVUtil.java:71)
at org.tmatesoft.svn.core.internal.io.dav.DAVUtil.getBaselineProperties(DAVUtil.java:239)
at org.tmatesoft.svn.core.internal.io.dav.DAVRepository.getRevisionProperties(DAVRepository.java:245)
at org.tmatesoft.svn.core.wc.SVNWCClient.doGetRevisionProperty(SVNWCClient.java:3089)
at org.tmatesoft.svn.core.wc.SVNWCClient.doGetRevisionProperty(SVNWCClient.java:1364)
at org.tmatesoft.svn.core.javahl.SVNClientImpl.revProperties(SVNClientImpl.java:1349)
... 17 more
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Startup line is:

/usr/java/jdk1.6.0_16/bin/java -XX:MaxPermSize=128m -XX:PermSize=128m -Xms1024m -Xmx2048m -XX:-UseGCOverheadLimit -XX:MaxNewSize=128m -Dfisheye.library.path= -Dfisheye.inst=/d01/FishEye/SVN -Djava.awt.headless=true -Djava.endorsed.dirs=/d01/FishEye/fecru-2.3.6/lib/endorsed -jar /d01/FishEye/fecru-2.3.6/fisheyeboot.jar start
===============
Top shows:

top - 11:27:13 up 379 days, 15:23, 1 user, load average: 3.43, 3.36, 3.39
Tasks: 119 total, 1 running, 118 sleeping, 0 stopped, 0 zombie
Cpu(s): 44.1%us, 3.3%sy, 0.0%ni, 44.7%id, 7.8%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 8177484k total, 7814496k used, 362988k free, 388624k buffers
Swap: 8193140k total, 116k used, 8193024k free, 5171908k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
535 root 10 -5 0 0 0 D 0 0.0 51:49.35 kjournald
23526 fisheye 15 0 24064 2040 1448 R 0 0.0 0:00.01 top
2864 root 15 0 0 0 0 D 0 0.0 0:07.76 pdflush
====================
Free shows:

total used free shared buffers cached
Mem: 8177484 7814372 363112 0 388624 5172104
-/+ buffers/cache: 2253644 5923840
Swap: 8193140 116 8193024