How to match threads from a Java thread dump and gdb

Issue

I have a problem of identify a ill thread of openjdk.
For example

"btpool0-9 - Acceptor0 SocketConnector @ 0.0.0.0:8983" prio=10 tid=0x9c027000 nid=0x2f56 runnable [0x9bd25000]
   java.lang.Thread.State: RUNNABLE
        at java.net.ServerSocket.implAccept(ServerSocket.java:468)
        at java.net.ServerSocket.accept(ServerSocket.java:438)
        at org.mortbay.jetty.bio.SocketConnector.accept(SocketConnector.java:97)
        at org.mortbay.jetty.AbstractConnector$Acceptor.run(AbstractConnector.java:516)
        at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)

"btpool0-8" prio=10 tid=0x9c025800 nid=0x2f55 runnable [0x9bd76000]
   java.lang.Thread.State: RUNNABLE
        at java.lang.StringBuilder.toString(StringBuilder.java:447)
        at org.apache.solr.core.SolrCore.execute(SolrCore.java:1289)
        at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:341)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:244)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1089)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)
        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
        at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:211)
        at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:285)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:502)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:821)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:208)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:378)
        at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:226)
        at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)

"btpool0-7" prio=10 tid=0x9c024000 nid=0x2f54 runnable [0x9bdc7000]
   java.lang.Thread.State: RUNNABLE
        at java.lang.StringBuffer.toString(StringBuffer.java:602)
        - locked <0xaf8d1788> (a java.lang.StringBuffer)
        at org.mortbay.util.Utf8StringBuffer.toString(Utf8StringBuffer.java:146)
        at org.mortbay.util.UrlEncoded.decodeUtf8To(UrlEncoded.java:257)
        - locked <0xaf8d1720> (a org.mortbay.util.MultiMap)
        at org.mortbay.jetty.HttpURI.decodeQueryTo(HttpURI.java:450)
        at org.mortbay.jetty.Request.extractParameters(Request.java:1236)
        at org.mortbay.jetty.Request.getParameterMap(Request.java:650)
        at org.apache.solr.request.ServletSolrParams.<init>(ServletSolrParams.java:29)
        at org.apache.solr.servlet.StandardRequestParser.parseParamsAndFillStreams(SolrRequestParsers.java:383)
        at org.apache.solr.servlet.SolrRequestParsers.parse(SolrRequestParsers.java:114)
        at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:212)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1089)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)

I then use gdb to attach to the java process and run command info threads and I got a list of OS threads like

  32 Thread 0xb7f75b90 (LWP 12094)  0x00bcb402 in __kernel_vsyscall ()
  31 Thread 0x9cd08b90 (LWP 12095)  0x00bcb402 in __kernel_vsyscall ()
  30 Thread 0x9cc87b90 (LWP 12096)  0x00bcb402 in __kernel_vsyscall ()
  29 Thread 0x9cc06b90 (LWP 12097)  0x00bcb402 in __kernel_vsyscall ()
  28 Thread 0x9cb85b90 (LWP 12098)  0x00bcb402 in __kernel_vsyscall ()
* 27 Thread 0x9c931b90 (LWP 12100)  0x00f69d4c in ?? () from /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/lib/i386/server/libjvm.so
  26 Thread 0x9c8b0b90 (LWP 12101)  0x00bcb402 in __kernel_vsyscall ()
  25 Thread 0x9c85fb90 (LWP 12102)  0x00bcb402 in __kernel_vsyscall ()
  24 Thread 0x9c60eb90 (LWP 12103)  0x00bcb402 in __kernel_vsyscall ()
  23 Thread 0x9c5bdb90 (LWP 12104)  0x00bcb402 in __kernel_vsyscall ()
  22 Thread 0x9c53cb90 (LWP 12105)  0x00bcb402 in __kernel_vsyscall ()
  21 Thread 0x9c4bbb90 (LWP 12106)  0x00bcb402 in __kernel_vsyscall ()
  20 Thread 0x9c46ab90 (LWP 12107)  0x00bcb402 in __kernel_vsyscall ()
  19 Thread 0x9c37fb90 (LWP 12108)  0x00bcb402 in __kernel_vsyscall ()
  18 Thread 0x9bfffb90 (LWP 12109)  0x00bcb402 in __kernel_vsyscall ()
  17 Thread 0x9bfaeb90 (LWP 12110)  0x00bcb402 in __kernel_vsyscall ()
  16 Thread 0x9bf5db90 (LWP 12111)  0x00bcb402 in __kernel_vsyscall ()
  15 Thread 0x9bf0cb90 (LWP 12112)  0x00bcb402 in __kernel_vsyscall ()
  14 Thread 0x9bebbb90 (LWP 12113)  0x00bcb402 in __kernel_vsyscall ()
  13 Thread 0x9be6ab90 (LWP 12114)  0x00bcb402 in __kernel_vsyscall ()
  12 Thread 0x9be19b90 (LWP 12115)  0x00bcb402 in __kernel_vsyscall ()
  11 Thread 0x9bdc8b90 (LWP 12116)  0x00bcb402 in __kernel_vsyscall ()
  10 Thread 0x9bd77b90 (LWP 12117)  0x00bcb402 in __kernel_vsyscall ()
  9 Thread 0x9bd26b90 (LWP 12118)  0x00bcb402 in __kernel_vsyscall ()
  8 Thread 0x9bc3ab90 (LWP 12119)  0x00bcb402 in __kernel_vsyscall ()
  7 Thread 0x9b7ffb90 (LWP 12120)  0x00bcb402 in __kernel_vsyscall ()
  6 Thread 0x9bbddb90 (LWP 12121)  0x00bcb402 in __kernel_vsyscall ()
  5 Thread 0x9bb8cb90 (LWP 12122)  0x00bcb402 in __kernel_vsyscall ()
  4 Thread 0x9b7aeb90 (LWP 12141)  0x00bcb402 in __kernel_vsyscall ()
  3 Thread 0x9b75db90 (LWP 12147)  0x00bcb402 in __kernel_vsyscall ()
  2 Thread 0x9afffb90 (LWP 12192)  0x00bcb402 in __kernel_vsyscall ()
  1 Thread 0xb7f766c0 (LWP 12093)  0x00bcb402 in __kernel_vsyscall ()

How do I find which Java threads map to which OS threads?