I was able to trigger the segfault just by running the scope from a
terminal using the command line found in the dbus service activation
file. For example:
/usr/bin/python3 /usr/share/unity-scopes/scope-runner-dbus.py -s
info/calculator.scope
When run, I get the following error message:
*** Error in `/usr/bin/python3': free(): invalid next size (fast):
0x0000000000cb77e0 ***
Attached is a stack trace with symbols for the relevant libraries
available. The inner call here is a to the overriden get_scopes()
implementation of the Python UnityScopeLoader subclass.
Frames #8 and #9 are the libffi stubs to marshal this function call.
Frame #7 is the function that takes the libffi function call data and
calls a Python function, converting the arguments as needed.
While frame #6 says it is the same function, it looks to actually be an
inlined version of _invoke_state_clear, which is called right at the end
of _pygi_closure_handle. So at this point, the Python implementation of
get_scopes() has finished running, and it is trying to clean up
afterwards.
** Attachment added: "stacktrace.txt"
https://bugs.launchpad.net/ubuntu/+source/libunity/+bug/1538471/+attachment/4608318/+files/stacktrace.txt
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https://bugs.launchpad.net/bugs/1538471
Title:
scope-runner-dbus.py assert failure: *** Error in `/usr/bin/python3':
free(): invalid next size (fast): 0x0000000001ca17b0 ***
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