Red Hat Bugzilla – Bug 589908
QMF python console: list index out of range FAILURE
Last modified: 2011-08-12 12:02:01 EDT
Created attachment 412274 [details] C++ QMF agent with Python test While testing bug 547519, I found this strange behavior: Traceback (most recent call last): File "<stdin>", line 5, in ? IndexError: list index out of range FAILURE Version-Release number of selected component (if applicable): python-qpid-0.7.938298-1.el5 qpid-cpp-server-0.7.939184-1.el5 Very easily reproducible: 1. run qpidd 2. run 'while perftest; do :; done' in one terminal (this is not vital) 3. run 'while ./runtest.sh; do :; done' in qmf-agent-20100507 directory in another terminal Actual results: IndexError: list index out of range Expected results (it appears, but it should appear ALWAYS): {u'second': 34, u'map-data': {u'numeric-data': 10000, u'string-data': 'Text'}, u'first': 'String data'}
On python-qpid-0.7.946106-2.el5 I am getting this error on _every_ run instead of occasionally. Raising priority.
See TCMS https://tcms.engineering.redhat.com/case/47650/?from_plan=2216
Strangely enough, on RHEL6, python-qmf-0.7.946106-4.el6.noarch it ends with same error only ocassionally.
I am retesting this with python-qpid-0.7.946106-4.el5 now and everything seems to be working, running in a loop of one thousand runs, will get back with results soon.
So the problem is that 17 out of 1000 runs ended with following: -------------------------------------------------------------------------- {u'second': 34, u'map-data': {u'numeric-data': 10000, u'string-data': 'Text'}, u'first': 'String data'} Exception in thread Thread for broker: localhost:5672 (most likely raised during interpreter shutdown): Traceback (most recent call last): File "/usr/lib64/python2.4/threading.py", line 442, in __bootstrap File "/usr/lib/python2.4/site-packages/qmf/console.py", line 2539, in run File "/usr/lib64/python2.4/Queue.py", line 125, in get exceptions.TypeError: 'NoneType' object is not callable Unhandled exception in thread started by Error in sys.excepthook: Original exception was: -------------------------------------------------------------------------- The rest ended merely with the first line, {u'second': 34, u'map-data': {u'numeric-data': 10000, u'string-data': 'Text'}, u'first': 'String data'} Everything was performed on RHN-up-to-date RHEL5 x86_64 with qpid-cpp-server-0.7.946106-6.el5 running with --auth=no. python-qpid-0.7.946106-4.el5
Created attachment 430267 [details] C++ QMF agent with Python test in a loop This is the reproducer I used.
I believe you can avoid that by calling s.delBroker(b) at the end of the python script.
Thank you, Gordon. This way the only remaining problem is cleared out and I will now focus on verifying this bug on all the supported systems.
Created attachment 430270 [details] C++ QMF agent with a fixed Python test in a loop Verified on RHEL5 x86_64 qpid-cpp-server-0.7.946106-6.el5 python-qpid-0.7.946106-4.el5 python-qmf-0.7.946106-5.el5
Oh no, sorry, it is not working on i386. ------------------------------------------ Traceback (most recent call last): File "<stdin>", line 5, in ? IndexError: list index out of range ------------------------------------------ RHEL5.5 i386 qmf-devel-0.7.946106-6.el5 python-qmf-0.7.946106-5.el5 python-qpid-0.7.946106-4.el5 qpid-cpp-server-0.7.946106-6.el5 Putting back to ASSIGNED.
Excuse me, this is rather error on the side of program I use. It should first check if the list contains the element it wants to read. Is this assumption right? ------------------------------------------- from qmf.console import Session s = Session() b = s.addBroker() parents = s.getObjects(_class="parent") # check should go here print parents[0].args s.delBroker(b) -------------------------------------------