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https://issues.apache.org/jira/browse/TAPESTRY-2473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607295#action_12607295
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Howard M. Lewis Ship commented on TAPESTRY-2473:
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What's odd here is that all the threads are blocked in withRead() (i.e.,
acquiring the shared read lock). That's very odd because I don't see any
thread inside withWrite() (i.e., with the exclusive write lock). I remember
there was a earlier hickup where Tapestry's use of ReentrantReadWriteLock
tripped across a JDK bug.
> Thread Lock Ups, unkonwn cause
> ------------------------------
>
> Key: TAPESTRY-2473
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2473
> Project: Tapestry
> Issue Type: Bug
> Components: Framework
> Affects Versions: 5.0.11, 5.0.12, 5.0.13
> Environment: Red Hat, Tomcat, java version "1.5.0_10"
> Reporter: Fernando
> Priority: Critical
> Attachments: js.txt, js2.txt
>
>
> We are running in production, and pretty regularly the system seems to hang
> up. After I do a jstack it looks like all the threads are tied up against
> some lock.
> Can you help me figure out the root cause?
> I will be attaching the full jstack the the stuck threads all look like:
> Thread 25014: (state = BLOCKED)
> - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information
> may be imprecise)
> - java.util.concurrent.locks.LockSupport.park() @bci=5, line=118 (Compiled
> frame)
> - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(int)
> @bci=10, line=1124 (Compiled frame)
> -
> org.apache.tapestry.ioc.internal.util.ConcurrentBarrier.withRead(org.apache.tapestry.ioc.internal.util.Invokable)
> @bci=27, line=70 (Compiled frame)
> - $RequestHandler_11aa7f96e6c.service(org.apache.tapestry.services.Request,
> org.apache.tapestry.services.Response) @bci=10 (Compiled frame)
> -
> org.apache.tapestry.services.TapestryModule$12.service(javax.servlet.http.HttpServletRequest,
> javax.servlet.http.HttpServletResponse) @bci=40, line=924 (Compiled frame)
> -
> $HttpServletRequestHandler_11aa7f96e65.service(javax.servlet.http.HttpServletRequest,
> javax.servlet.http.HttpServletResponse) @bci=10 (Compiled frame)
> -
> org.apache.tapestry.internal.services.IgnoredPathsFilter.service(javax.servlet.http.HttpServletRequest,
> javax.servlet.http.HttpServletResponse,
> org.apache.tapestry.services.HttpServletRequestHandler) @bci
> =95, line=62 (Compiled frame)
> -
> $HttpServletRequestFilter_11aa7f96e63.service(javax.servlet.http.HttpServletRequest,
> javax.servlet.http.HttpServletResponse,
> org.apache.tapestry.services.HttpServletRequestHandler) @bci=7 (Compiled
> frame)
> -
> $HttpServletRequestHandler_11aa7f96e65.service(javax.servlet.http.HttpServletRequest,
> javax.servlet.http.HttpServletResponse) @bci=10 (Compiled frame)
> -
> $HttpServletRequestHandler_11aa7f96e65.service(javax.servlet.http.HttpServletRequest,
> javax.servlet.http.HttpServletResponse) @bci=10 (Compiled frame)
> - org.apache.tapestry.TapestryFilter.doFilter(javax.servlet.ServletRequest,
> javax.servlet.ServletResponse, javax.servlet.FilterChain) @bci=12, line=168
> (Compiled frame)
> ......
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