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:
> &gt; Please find attached the info. I can reproduce this crash.
> &gt; 
> &gt; Thank you for helping, Michael
> &gt; 
> &gt; Am 18.01.26 um 16:43 schrieb Ted Felix:
> &gt;&gt; Ok. Usually for this kind of thing, running a debug build using ASAN 
> &gt;&gt; will give us a lot more information when it does crash.&nbsp; Or you 
> can 
> &gt;&gt; run a debug build with gdb, which is a little more cumbersome, but 
> &gt;&gt; should get some good crash information for us to work with.
> &gt;&gt;
> &gt;&gt; &nbsp; Let me know if you need help setting either of those 
> up.&nbsp; The cmake 
> &gt;&gt; line for ASAN is:
> &gt;&gt;
> &gt;&gt; cmake .. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_FLAGS="-Werror - 
> &gt;&gt; fsanitize=address -fno-omit-frame-pointer"
> &gt;&gt;
> &gt;&gt; &nbsp; It's in the README.md.
> &gt;&gt;
> &gt;&gt; Ted.


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