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Re: [Denemo-devel] denemo causing session crash


From: Richard Shann
Subject: Re: [Denemo-devel] denemo causing session crash
Date: Sat, 21 Apr 2018 17:46:57 +0100

Thanks for these updates

Richard
On Sat, 2018-04-21 at 12:34 -0400, Bric wrote:
> > On April 8, 2018 at 12:47 PM Richard Shann wrote:
> > 
> > 
> > On Sun, 2018-04-08 at 07:15 -0400, Bric wrote:
> > > > On April 7, 2018 at 9:58 PM Bric wrote: 
> > > > 
> > > > I occasionally experience a denemo crash on my Ubuntu 16.04 LTS
> > > > which crashes my entire session, ending with the Ubuntu user
> > > > login
> > > > screen.
> > > > This has happened several times, when I am refreshing the
> > > > "Typeset
> > > > Music" window, after some particular change. And today it
> > > > happened
> > > > again after the pop-up dialog "Restart Subsystem?", to which I
> > > > answered "OK" and then got the crash. And then another crash
> > > > logout when I changed settings - unchecked "Spill notes to next
> > > > measure" and (i believe) clicked to refresh the Typeset Window.
> > > > After that it crashed again, when I (re)started denemo (after I
> > > > deleted the auto-saved document), before any user activity,
> > > > 
> > > > After that I logged back in, and it has run without crashing.
> > > > 
> > > > It might be tricky to capturing the crash/debug messages here
> > > > (not
> > > > sure), since I get totally logged out, immediately (I could be
> > > > wrong)
> > > > 
> > > > Just thought I'd report it finally. This has been rare, such
> > > > that
> > > > I kept ignoring it.
> > > > 
> > > > I am using Gnome metacity classic
> > > > 
> > > > Linux **** 4.4.0-112-generic #135-Ubuntu SMP Fri Jan 19
> > > > 11:48:36
> > > > UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
> > > Hmm... This install/build of Denemo is becoming unusable for me.
> > > 
> > > Just crashed again, when I started it and then invoked the
> > > playback
> > > window. I was trying to fix my lack of audio playback - it
> > > suddenly
> > > went silent in all windows that should produce playback sound.
> > > When
> > > I press "play" in the editor there are no errors, and the cursor
> > > is
> > > moving, as it normally does during playback, but there is no
> > > sound.
> > > 
> > > I am suspecting the crashes to be related to the audio
> > > component... I
> > > used to use jack audio on other Ubuntu setups, but have not been
> > > lately - using pulse. I remember crashes years ago, related to
> > > the
> > > wrong audio configuration
> > > 
> > > Needless to say (but i'm saying it nonetheless): the x session
> > > crash
> > > is devastatingly disruptive; i don't remember experiencing
> > > anything
> > > like that before... an app bringing down the whole sessio
> 
> git-pulled and built a more recent snapshot a few days ago; it's been
> running without crashing so far. Still a bunch of theories on the
> crashes:
> 
> 1) My audio/midi  settings, which i had tinkered with prior to the
> crashes, were causing the audio subsystem to crash (and bring down
> the session). The new install ported over my settings - but maybe
> excluded the bad stuff?
> 2) It is/was a combination of my particular, flawed Ubuntu install,
> which cold-freezes on me every now and then (mostly during certain
> firefox browser activity), and i'm using retro metacity GNOME...
> which isn't the default windowing for latest Ubuntu. The freezes are
> consistently freezes, though, and the session crashes were always
> just that... the symptoms never crossed over.
> 3) Bad RAM ... not excluding that... but then, again, the new install
> hasn't crashed 
> 
> denemo --version:
> GNU Denemo version 2.2.7
> Gtk versions runtime: 3.18.9, compiled against: 3.18.9
> 
> > The only similar thing I have seen is some failure between Gtk and
> > X
> > when re-sizing the Print View - the program hangs with Gtk waiting
> > for
> > X to respond. I've also got the X-interaction stuck when telling
> > the
> 
> I've had a temporary pop-up "updating" window "hour-glass"
> indefinitely, during Print View updates/refresh. But it seems
> harmless, because I can dismiss it, and everything seems ok after
> that. (This is with my most recent install)
> 
> > debugger to stop the program at a point where a menu has just been
> > popped up - the menu has grabbed the interaction and the only thing
> > that works is Ctrl-Alt-Fn5 which gives a login prompt. I login and
> > then
> > kill off the denemo process at the command line and then use Ctrl-
> > Alt-
> > Fn7 to go back to my X-session.
> > 
> > You may find it a good practice to *always* run Denemo from the gdb
> > prompt - it runs just as well but if it crashes gdb will be able to
> > tell you where the crash happened.
> > > Also: My gnome session gives me some errors when I first log into
> > > Ubuntu, but i haven't had any "fatalities" until this one, so
> > > i've
> > > been ignoring those. Perhaps it's time to address these - could
> > > be
> > > some weird combination of that plus denemo specifics.
> > 
> > The re-start of the Audio subsystem can certainly cause a crash,
> > that's
> > why the dialog asks you before trying it. I don't have any real
> > suspicion that the problem lies with Denemo, unknown MIDI hardware
> > is
> > notoriously difficult to interact with safely, the manufacturer may
> > or
> > may not have got it right. Currently my machine randomly switches
> > between line out and headphones, but I'm pretty sure that is a
> > hardware
> > fault that has developed. It happens a lot after resuming a
> > session,
> > but settles down for long periods after a while.
> > 
> > Richard



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