Getting a stack trace when addon crashes Blender I am developing an addon for Blender 2.69, and a specific python library call is causing Blender to crash. I have tried to enclose the call in a try-catch block, but it still crashes. As a result, I can't view the error details in the system console.

Is there any way I could print the stack trace to a file before crashing, or any other way I could access this information?

The problematic library call is intriguing on its own, and I've posted it as a Stack Overflow question here: PIL Image.save() function fails in Blender python
If you really want to invest time to find why it crashes you might be best doing your own debug build of Blender and checking exactly where it crashes in a debugger.

Failing that, blender does write a stack trace on exit (on Linux at least).

Try run blender from a terminal and on crash you will get a message like...

Writing: /tmp/blender.crash.txt

# Blender 2.69 (sub 9), Unknown revision
bpy.data.window_managers["WinMan"].(null) = 'F8'  # Property
bpy.data.window_managers["WinMan"].(null) = 'F8'  # Property

# backtrace
/src/blender/blender.bin() [0x709cf1]
/src/blender/blender.bin() [0x709f7a]
/usr/lib/libc.so.6(+0x353e0) [0x7f617dd343e0]
/src/blender/blender.bin() [0x141ca0c]
/src/blender/blender.bin(RNA_property_type+0x27) [0x141d77e]
/src/blender/blender.bin(RNA_property_collection_begin+0x2f) [0x1424665]
/src/blender/blender.bin(WM_operator_properties_sanitize+0x55) [0x727453]
/src/blender/blender.bin() [0x720de3]
/src/blender/blender.bin(WM_keyconfig_update+0x9f) [0x7240bb]
/src/blender/blender.bin(wm_event_do_handlers+0xa03) [0x718d6a]
/src/blender/blender.bin(WM_main+0x33) [0x70da43]
/src/blender/blender.bin(main+0x44d) [0x70c971]
/usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7f617dd20b05]
/src/blender/blender.bin() [0x709009]


Or you could look into Pythons faulthandler module, which can catch segfaults and report information about this too.