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https://issues.apache.org/jira/browse/PYLUCENE-17?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andi Vajda updated PYLUCENE-17:
-------------------------------
Attachment: diff.17.txt
With this patch, I can no longer reproduce this bug using Greg's test. Please
try it with your use case and let me know if this resolves the issue for your
use case too.
In this patch, I only use the lock if the class$ variable was found to be NULL.
> 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, 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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