show a python core dump, with full debug symbols

.travis.yml

@@ -1,40 +1,43 @@
-language: cpp
+language: python
 
 env:
   matrix:
-   - CRASH_PLEASE=boooooooom
-   - HAPPY_NO_CRASH=all-good
-
-compiler:
- # gcc compiler, clang would be fine too
- - gcc
+    # These must match one of the lines from `python-build --definitions`
+    #- PYTHON=2.6.9  ## 2.6 doesn't have the gdb tools
+    - PYTHON=2.7.8
+    - PYTHON=3.3.6
+    - PYTHON=3.4.2
 
 before_install:
  # install the gnu debugger for later use in reading the core file
  - sudo apt-get -y install gdb
+ # use pyenv to build a debug version of python
+ - sudo python-build --keep --debug $PYTHON /opt/python/${PYTHON}-dbg
+ # The cpython source tree has useful gdb tools that make its core dumps readable
+ - PYTHON_GDBTOOLS=$(ls -1rdt /tmp/python-build.*/Python-$PYTHON/Tools/gdb/ | head -1)
 
-install:
- # What is the current file size max for core files?
- # It is usually 0, which means no core file will be dumped if there is a crash 
- - ulimit -c
+
+ # make a virtualenv for the -dbg interpreter
+ - virtualenv --python /opt/python/${PYTHON}-dbg/bin/python virtualenv/python${PYTHON}-dbg
+ - source virtualenv/python${PYTHON}-dbg/bin/activate
+ - pip install virtualenv
 
 before_script:
- # Set the core file limit to unlimited so a core file is generated upon crash
- - ulimit -c unlimited -S
+ # What is the current file size max for core files?
+ # It is usually 0, which means no core file will be dumped if there is a crash
+ - ulimit -Hc  # hard limit
+ - ulimit -Sc  # soft limit
+ - python-build --definitions  # show available pythons
 
 script:
- - RESULT=0
- # Compile our demo program which will crash if
- # the CRASH_PLEASE environment variable is set (to anything)
- - g++ -o test might_crash.cpp -g -O0 -DDEBUG
  # Run the program to prompt a crash
- # Note: we capture the return code of the program here and add
- # `|| true` to ensure that travis continues past the crash
- - RESULT=$(./test > /dev/null)$? || true
- - if [[ ${RESULT} == 0 ]]; then echo "\\o/ our test worked without problems"; else echo "ruhroh test returned an errorcode of $RESULT"; fi;
- # If the program returned an error code, now we check for a
- # core file in the current working directory and dump the backtrace out
- - for i in $(find ./ -maxdepth 1 -name 'core*' -print); do gdb $(pwd)/test core* -ex "thread apply all bt" -ex "set pagination 0" -batch; done;
- # now we should present travis with the original
- # error code so the run cleanly stops
- - if [[ ${RESULT} != 0 ]]; then exit $RESULT ; fi;
+ - bash -c 'ulimit -Sc unlimited && source ./repro.sh'
+ # Now we check for a core file and dump the backtrace out
+ - >
+    find -regex '.*/core\(\.[0-9]+\)?' |
+    xargs -rn1 --verbose
+    gdb $(which python)
+    -ex "python import sys; sys.path.append('$PYTHON_GDBTOOLS'); import libpython; reload(libpython)"
+    -ex "thread apply all py-bt"
+    -ex "thread apply all bt"
+    -batch

repro.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -ex
+
+rm -rf clean
+mkdir clean
+cd clean/
+virtualenv tmpvenv
+
+./tmpvenv/bin/pip install --upgrade pip wheel coverage
+./tmpvenv/bin/pip wheel coverage
+./tmpvenv/bin/python -m coverage.__main__ run -m pip install --no-index --ignore-installed --find-links wheelhouse/ coverage