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From "Amichai Rothman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-8812) JVM Crashes on Windows x86
Date Mon, 16 Feb 2015 13:18:11 GMT
Amichai Rothman created CASSANDRA-8812:
------------------------------------------

             Summary: JVM Crashes on Windows x86
                 Key: CASSANDRA-8812
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8812
             Project: Cassandra
          Issue Type: Bug
         Environment: Windows 7 running x86(32-bit) Oracle JDK 1.8.0_u31
            Reporter: Amichai Rothman
         Attachments: crashtest.tgz

Under Windows (32 or 64 bit) with the 32-bit Oracle JDK, the JVM may crash due to EXCEPTION_ACCESS_VIOLATION.
This happens inconsistently. The attached test project can recreate the crash - sometimes
it works successfully, sometimes there's a Java exception in the log, and sometimes the hotspot
JVM crash shows up (regardless of whether the JUnit test results in success - you can ignore
that). Run it a bunch of times to see the various outcomes.

Note that both when the Java exception is thrown and when the JVM crashes, the stack trace
is almost the same - they both eventually occur in CommitLogSegment.sync when accessing the
buffer (MappedByteBuffer): if it happens to be in buffer.force(), then the Java exception
is thrown, and if it's in one of the buffer.put() calls before it, then the JVM crashes. This
possibly exposes a JVM bug as well in this case. So it basically looks like a race condition
which results in the buffer sometimes being used after it is no longer valid.

I recreated this on a PC with Windows 7 64-bit running the 32-bit Oracle JDK, as well as on
a modern.ie virtualbox image of Windows 7 32-bit running the JDK, and it happens both with
JDK 7 and JDK 8. Also defining an explicit dependency on cassandra 2.1.2 (as opposed to the
cassandra-unit dependency on 2.1.0) doesn't make a difference. At some point in my testing
I've also seen a Java-level exception on Linux, but I can't recreate it at the moment with
this test project, so I can't guarantee it.




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