On Mon, 2017-05-15 at 21:33 -0400, A. F. Cano wrote:
> On Sat, May 13, 2017 at 04:47:56PM -0400, A. F. Cano wrote:
> > On Wed, May 10, 2017 at 02:21:07PM -0400, I wrote:
> > > I have encountered this the last time I connected.  The ppp
> > > connection
> > > was working fine but this message kept repeating the whole time
> > > the
> > > connection was up:
> > > 
> > > May  9 21:02:06 fbx NetworkManager[379]: g_signal_emit_valist:
> > > assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
> > > ...
> > 
> > But now these messages have stopped.  These packages have been
> > recently
> > upgraded, so it's possible that a bug was fixed in one of them.
> > 
> > 2017-05-13 06:39:04,329 INFO Packages that will be upgraded: file
> > gcc-6-base init init-system-helpers initramfs-tools initramfs-
> > tools-core
> > iso-codes libfreetype6 libgcc1 libgomp1 libmagic-mgc libmagic1
> > libnss-myhostname libpam-systemd libstdc++6 libsystemd0 libudev1
> > ntp
> > ssl-cert systemd systemd-sysv udev
> > 
> > Or maybe not and it's some non-repeatable trigger, but the
> > backtrace
> > previously supplied seemed to point to a lot of libraries.
> 
> This seems to be more random than I hoped.  The g_signal_emit_valist
> messages are back...
> 
> May 15 21:28:10 fbx NetworkManager[31616]: instance with invalid
> (NULL)
> class pointer
> May 15 21:28:10 fbx NetworkManager[31616]: g_signal_emit_valist:
> assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
> May 15 21:28:15 fbx NetworkManager[31616]: instance with invalid
> (NULL)
> class pointer
> May 15 21:28:15 fbx NetworkManager[31616]: g_signal_emit_valist:
> assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
> 
> But this time with a NULL class pointer, so it appears that further
> checks are being made.

Hi,

These are bugs. If you set G_DEBUG=fatal-criticals, then glib will
core-dump for such assertion failures.
You can also set 
  [main]
  debug+=fatal-warnings
in NetworkManager.conf

Make sure to install debugging symbols, and get a backtrace. It might
be simpliest to run NM under gdb (with --debug to keep it in
forground).


best,
Thomas

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