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    <p>I have encountered the same error, and I managed to figure out what is happening, at least in my case. It looks like a bug in JRockit, and your question was very helpful in investigating it.</p> <p>The search that is carried out for the "magic number" placed in the slot extends over two pages of data starting at the beginning of the TEB. However, there are only 64 slots worth of storage located within the TEB itself. See <a href="http://msdn.microsoft.com/en-gb/library/windows/desktop/ms686708(v=vs.85).aspx" rel="nofollow">http://msdn.microsoft.com/en-gb/library/windows/desktop/ms686708(v=vs.85).aspx</a>.</p> <p>If the storage slot that is allocated is of index 64 or higher, rather than putting the data in the embedded array, Windows puts it into the block pointed to by the TlsExpansionSlots pointer. Since this is outside the TEB, the search for the magic number fails and JRockit produces this error.</p> <p>My instance of this also occurred within a .NET program. My speculation is that the CLR makes significant use of TLS, making it more likely for a high slot number to be allocated.</p> <p>In my case, JRockit actually crashed while attempting to write the log line, possibly because it happens so early that the log has not yet been created. Not sure which version of JRockit you're using. Mine is:</p> <pre><code>C:\&gt;java -version java version "1.6.0_14" Java(TM) SE Runtime Environment (build 1.6.0_14-b08) BEA JRockit(R) (build R27.6.5-32_o-121899-1.6.0_14-20091001-2107-windows-ia32, compiled mode) </code></pre> <p>I don't know if this is fixed in later revisions. If it isn't we (ie. my employer) will probably have to raise it with Oracle.</p>
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    1. COI tried allocating 64 tls slots before initializing the JVM and I managed to replicate the error on my side, looks like it is a bug with the JVM like you said.
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    2. COI tried wit the latest jrockit-jre1.6.0_37-R28.2.5 that I can find on the oracle website, the problem still persists
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    3. COThanks for checking. I'm going to get a ticket raised with Oracle.
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