Re: [Denemo-devel] Denemo sometimes hangs (crashes) on quit

[Andreas Schneider]

Am 27.10.2015 um 09:44 schrieb Richard Shann:
>> Yes, this is with MIDI hardware attached (my master keyboard), and I'm
>> using the latest git version (I do not know how to swtich to the release
>> candidate in git).
> well, no need at the moment as they are the same - we are in code freeze
> now for the release.
>>  It returned to the (gdb) prompt (that is, the prompt
>> appeared when pressing the return key as many text was in the console
>> before). 
> This returning to the prompt when pressing the Return key is something I
> also see quite often, I've not been sure that it is an indicator of a
> crash during the termination of the Denemo process, I think perhaps not,
> as that should be accompanied by a message from GDB about the signal
> received (e.g. SEGFAULT ...).
> 
> 
>> However, I have also experienced cases where I had to hit
>> ctrl-C to get the (gdb) prompt.
> 
> That would be the process hanging (ie repeatedly looping over some
> section of code) and that would indicate a fault in the process
> termination. I can only guess that the thread code is not stopping
> correctly and something ends up waiting for something else - I think
> that would result in some (fairly harmless) zombie process or something
> when run outside gdb. Can anyone who regularly uses Denemo on a
> GNU/Linux system say whether they notice anything strange on exit when
> not run under gdb control?
> 
> I think this will have to wait the arrival on the Denemo team of fresh
> talent! It doesn't seem to be a serious nuisance, and perhaps doesn't
> even happen on Windows where most users are. (Please speak up Windows
> users if you know differently!)

What I forgot to mention is that the Denemo windows are still there, but
do not respond anymore. That is, when running outside gdb, Denemo just
stops to respond on File > Quit, but all windows stay there (but are not
redrawn of course).

Andreas