[Libreoffice] Crash in master: Sum button in sc

[Kohei Yoshida]

Hi Soeren,

On Tue, 2011-01-25 at 23:13 +0100, Soeren Moeller wrote:
> Hi
> 
> I just noticed a bug in master (pull about 1h ago):
> When I in calc press the sum button (shaped like a sigma), then calc
> crashes instantly and without any message. This seems to happen only
> when calc doesn't guess a sum area by itself. (E.g. if there are
> numbers in the cells above the marked cell, calc suggest those cells
> as a sum area, and it works fine, but if there are no cells with
> numbers nearby it crashes). Using the sum function through the
> Function Wizard works fine, though.

Well, I'm not surprised; after all it's master where things are fairly
unstable, and crashes are common occurrences. :-)

Having said that, it's good to catch these nasty crashes early, and I'm
glad you brought this issue to light.

Are you familiar with getting stack traces with gdb?  That would be the
first step when investigating a crash.  To get a meaningful stack trace
you need to re-build the sc module with debug symbol compiled in.

http://wiki.documentfoundation.org/Development/Native_Build#Partial_debug_build

Once done, start Calc, attach gdb, reproduce the crash and get a
backtrace in gdb.  That will give you the location of the crash from
which you can sniff around the code to see what's going wrong.

> I'm just getting used to the codebase, so it would be nice if someone
> who is more into it would take a look, and check if the error can be
> reproduced by others. I can reproduce it even after a "make clean; ./g
> pull; make; make dev-install".

Yup, this is perfectly reproducible.

Anyway, it would be great if you could get a backtrace output from gdb
to see where the crash occurs.

Let me know if you need additional help.

Best,

Kohei

-- 
Kohei Yoshida, LibreOffice hacker, Calc
<kyoshida at novell.com>