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As part of #40, we started noticing that our tests were failing with a segfault in the Travis CI container, but only for Python 3.4.
We were unable to reproduce this locally on our laptops, but with Docker, and using a Travis CI container, we can. Here are the steps to trigger a segfault:
# Start Docker
docker run -it quay.io/travisci/travis-python /bin/bash
Once you're in your Docker container, run these commands:
sudo add-apt-repository ppa:fkrull/deadsnakes
sudo apt-get update
sudo apt-get install python3.4
pip install pip==7.1.0
pip install virtualenv==13.1.2
virtualenv -p /usr/bin/python3.4 /test
source /test/bin/activate
cd ~
git clone --depth=50 https://github.com/confluentinc/confluent-kafka-python.git
cd confluent-kafka-python/
git fetch origin pull/40/head:40
git checkout 40
export LD_LIBRARY_PATH=$PWD/tmp-build/lib
bash tools/bootstrap-librdkafka.sh v0.9.2 tmp-build
pip install pytest-timeout
pip install -v --global-option=build_ext --global-option="-Itmp-build/include/:/opt/python/3.4.2/include/python3.4m" --global-option="-Ltmp-build/lib" . .[avro]
git checkout 8148a79026d7324c34a24a03ba9043ebe2f931fd
py.test -v --timeout 20 --ignore=tmp-build --import-mode append
This will show a segfault before the tests finish.
Furthermore, I'm able to trigger this on master without any of our changes. After the above commands, run:
git checkout master
Then apply this diff:
diff --git a/tests/test_threads.py b/tests/test_threads.py
index 09f6467..e4f76e8 100644
--- a/tests/test_threads.py
+++ b/tests/test_threads.py
@@ -64,6 +64,35 @@ def test_thread_safety():
print('Done')
+import time
+class myThread (threading.Thread):
+ def __init__(self, threadID, name, counter):
+ threading.Thread.__init__(self)
+ self.threadID = threadID
+ self.name = name
+ self.counter = counter
+ def run(self):
+ print("Starting " + self.name)
+ print_time(self.name, self.counter, 5)
+ print("Exiting " + self.name)
+
+def print_time(threadName, delay, counter):
+ while counter:
+ if exitFlag:
+ threadName.exit()
+ time.sleep(delay)
+ print("%s: %s" % (threadName, time.ctime(time.time())))
+ counter -= 1
+
+def test_foo():
+ # Create new threads
+ thread1 = myThread(1, "Thread-1", 1)
+ thread2 = myThread(2, "Thread-2", 2)
+
+ # Start new Threads
+ thread1.start()
+ thread2.start()
+
It's just some example of Python threading that I found on Stack Overflow. After the diff is applied, run the same py.test command again. It will again segfault.
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