> If this is a bug and very rare, will it be named after me?
Ha! No. It will be named after whatever part of Qt is messing this up.
Give the latest in git a try. I've rewritten all the matrix zoom
code and it might be more stable for you now.
Ted.
On 1/21/26 6:52 AM, Babarosa wrote:
Do you have a procedure that starts from an empty composition?
Not really, I didn't manage to crash Rosegarden using an empty composition.
Please do not laugh, but to trigger this crash I use the zoom wheels very
rapidly like a lunatic (!) from maximum to minimum. Sometimes Rosegarden
crashes after 15 movements, sometimes it takes 30 seconds.
If this is a bug and very rare, will it be named after me?
Thanks and Greetings, Michael
Gesendet: Montag, 19. Januar 2026 um 03:25
Von: "Ted Felix" <[email protected]>
An: Babarosa <[email protected]>, rosegarden-user
<[email protected]>
Betreff: Re: [Rosegarden-user] lv2 support for Debian 12 & zooming crash
Fascinating. This crash only touches us once at Panned.cpp:66. And
that's just a message forward. Unlikely that it is an rg problem. More
likely a Qt5 bug. We might want to try watching for a null event
pointer there, but I have a feeling that never happens as it would cause
an earlier crash (shorter call stack).
Do you have a procedure that starts from an empty composition? Don't
spend any time on it if not. It would just be nice to see if it is
reproducible with Qt6 and Philip could test that very easily.
I'll spend a little time beating it up with some huge compositions I
have lying around.
Ted.
On 1/18/26 5:24 PM, Babarosa wrote:
> Please find attached the info. I can reproduce this crash.
>
> Thank you for helping, Michael
>
> Am 18.01.26 um 16:43 schrieb Ted Felix:
>> Ok. Usually for this kind of thing, running a debug build using ASAN
>> will give us a lot more information when it does crash. Or you
can
>> run a debug build with gdb, which is a little more cumbersome, but
>> should get some good crash information for us to work with.
>>
>> Let me know if you need help setting either of those up.
The cmake
>> line for ASAN is:
>>
>> cmake .. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_FLAGS="-Werror -
>> fsanitize=address -fno-omit-frame-pointer"
>>
>> It's in the README.md.
>>
>> Ted.
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