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

From: Richard Shann
Subject: Re: [Denemo-devel] Denemo sometimes hangs (crashes) on quit
Date: Tue, 27 Oct 2015 08:44:17 +0000

On Tue, 2015-10-27 at 08:12 +0100, Andreas Schneider wrote:
> Am 26.10.2015 um 22:43 schrieb Richard Shann:
> > Is this with some MIDI hardware attached? The back trace unfortunately
> > doesn't lead back to any particular place in the Denemo code, but there
> > are mentions of thread primitives, which shutting down the audio threads
> > might involve. Does it just hang or does it return to the gdb prompt?
> > I presume this is from the latest sources - meaning basically it's
> > version 2.0.0?
> 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!)


> Andreas
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