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
Attachments: 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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