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https://issues.apache.org/jira/browse/PYLUCENE-17?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13401049#comment-13401049
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Andi Vajda commented on PYLUCENE-17:
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Ok, I missed that the problem is with the C++ side of things, not the Python
layer.
And with your initializing$ change, you make getClass(true) return NULL so that
the locked path is taken. Got it.
Thank you for the explanation.
> Possible race condition with pylucene attachCurrentThread
> ---------------------------------------------------------
>
> Key: PYLUCENE-17
> URL: https://issues.apache.org/jira/browse/PYLUCENE-17
> Project: PyLucene
> Issue Type: Bug
> Environment: Linux 2.6.39
> Sun jdk 1.6.26
> Reporter: Greg Bowyer
> Labels: pylucene
> Attachments: PYLUCENE-17-3.patch, PYLUCENE-17-4.patch, backtrace,
> diff.17.txt, lucene-threadtest.py
>
>
> It looks like there is a possible race that can cause null pointer exceptions
> in the JVM, making it crash
> Because its a race it is hard to reproduce, the best luck I have had so far
> is dropping my FS cache in the OS, which seems to slow down the
> initialisation of the JVM enough to make it easier to reproduce.
> Attached is my test case
> Test session follows
> ---------------------------------------------------------------
> greg@localhost ~/programming/python $ sudo bash -c 'echo 3 >
> /proc/sys/vm/drop_caches'
> greg@localhost ~/programming/python $ python ./lucene-threadtest.py
> #
> # A fatal error has been detected by the Java Runtime Environment:
> #
> # SIGSEGV (0xb) at pc=0x00007f79226b35c8, pid=26581, tid=140158003312384
> #
> # JRE version: 6.0_26-b03
> # Java VM: Java HotSpot(TM) 64-Bit Server VM (20.1-b02 mixed mode linux-amd64
> compressed oops)
> # Problematic frame:
> # V [libjvm.so+0x4b05c8] instanceKlass::cached_itable_index(unsigned
> long)+0x18
> #
> # An error report file with more information is saved as:
> # /home/greg/programming/python/hs_err_pid26581.log
> #
> # If you would like to submit a bug report, please visit:
> # http://java.sun.com/webapps/bugreport/crash.jsp
> #
> Aborted (core dumped)
> greg@localhost ~/programming/python $ python ./lucene-threadtest.py
> greg@localhost ~/programming/python $ python ./lucene-threadtest.py
> greg@localhost ~/programming/python $ python ./lucene-threadtest.py
> greg@localhost ~/programming/python $ rm -r /tmp/test-index/
> greg@localhost ~/programming/python $ sudo bash -c 'echo 3 >
> /proc/sys/vm/drop_caches'
> greg@localhost ~/programming/python $ python ./lucene-threadtest.py
> #
> # A fatal error has been detected by the Java Runtime Environment:
> [thread 139988165344768 also had an error][thread 139988165344768 also had an
> error]#
> # SIGSEGV (0xb)
> at pc=0x00007f5197550a29, pid=27657, tid=139988039468800
> #
> # JRE version: 6.0_26-b03
> # Java VM: Java HotSpot(TM) 64-Bit Server VM (20.1-b02 mixed mode linux-amd64
> compressed oops)
> # Problematic frame:
> # V [libjvm.so+0x4f2a29] unsigned+0x299
> #
> # An error report file with more information is saved as:
> # /home/greg/programming/python/hs_err_pid27657.log
> #
> # If you would like to submit a bug report, please visit:
> # http://java.sun.com/webapps/bugreport/crash.jsp
> #
> Aborted (core dumped)
> greg@localhost ~/programming/python $ python ./lucene-threadtest.py
> greg@localhost ~/programming/python $ sudo bash -c 'echo 3 >
> /proc/sys/vm/drop_caches'
> greg@localhost ~/programming/python $ python ./lucene-threadtest.py
> #
> # A fatal error has been detected by the Java Runtime Environment:
> #
> # SIGSEGV (0xb) at pc=0x00007f51bc2eaa1e, pid=28124, tid=139988377052928
> #
> # JRE version: 6.0_26-b03
> # Java VM: Java HotSpot(TM) 64-Bit Server VM (20.1-b02 mixed mode linux-amd64
> compressed oops)
> # Problematic frame:
> # V [libjvm.so+0x4f2a1e] unsigned+0x28e
> #
> # An error report file with more information is saved as:
> # /home/greg/programming/python/hs_err_pid28124.log
> #
> # If you would like to submit a bug report, please visit:
> # http://java.sun.com/webapps/bugreport/crash.jsp
> #
> Aborted (core dumped)
> greg@localhost ~/programming/python $
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