assigned to @JDevlieghere

In case it's relevant, I should note that this all occurs under a breakpoint script. The script can be found at:

https://developer.mozilla.org/en-US/docs/Mozilla/Debugging/Debugging_on_Mac_OS_X#Setting_up_lldb

I should also note that when lldb is invoked directly from a terminal (i.e. not invoked by Xcode linking to liblldb to invoke the driver) and this breakpoint is set and runs, this problem does not occur.

I can reproduce this:

$ echo "script foo = 1" > test.lldb
$ lldb ./a.out
(lldb) b main
(lldb) breakpoint command add -s python
Enter your Python command(s). Type 'DONE' to end.
def function (frame, bp_loc, internal_dict):
"""frame: the lldb.SBFrame for the location at which you stopped
bp_loc: an lldb.SBBreakpointLocation for the breakpoint location information
internal_dict: an LLDB support object not to be used"""
target = frame.GetThread().GetProcess().GetTarget()
debugger = target.GetDebugger()
debugger.HandleCommand("command source -s true ./test.lldb")
DONE
(lldb) run
Traceback (most recent call last):
File "temp.py", line 11, in lldb_autogen_python_bp_callback_func__0
KeyError: 'foo'

Although unrelated, the repro is also hitting an assert in the editline implementation: lldbassert(m_editor_status != EditorStatus::Editing) in Editline::GetLine().