Re: WARNING regarding 4.3.x kernel

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On Thu, 2016-01-21 at 14:33 +0200, Cristian Sava wrote:
> On Thu, 2016-01-21 at 11:55 +0100, thibaut noah wrote:
> > Did you report it? seems like someone forgot to check the pointer
> > before accessing it.
> Not yet. Further investigation is needed.
> What I've done now in virtual environment:
> 1-Install F23 server, default, no options.
> 2-Update, reboot
> 3-Install minimal X:
>   dnf groupinstall base-x
>   dnf install xterm xorg-x11-xbitmaps xorg-x11-fonts-ISO8859-15-75dpi
> xorg-x11-fonts-ISO8859-15-100dpi xorg-x11-fonts-misc
>   dnf install xorg-x11-xdm xorg-x11-xsm xorg-x11-xkb-extras xorg-x11-
> xfs xorg-x11-xfs-utils xorg-x11-twm
> 4-Install VM environment:
>   dnf install qemu qemu-common qemu-guest-agent qemu-img qemu-kvm
> qemu-
> kvm-tools qemu-user qemu-system-x86
>   dnf install libvirt virt-manager virt-install
> 5-Switch to graphical and the error is there:
>   su -c virt-manager
> 6-Reboot and add very basic gnome:
>   dnf install gnome-desktop3 gnome-commander gnome-abrt gnome-disk-
> utility gnome-menus gnome-shell gnome-shell-extension-common gnome-
> terminal gnome-themes-standard gnome-tweak-tool
> 7-reboot, switch to graphical:
>  a) Still error in xterm: su -c virt-manager
>  b) Surprise: the VM icon works as expected!
> Same result on a phisical machine with the difference that trying to
> switch back to multi-user freezes the box.
> Anyone else want to test it?
> 
> > 2016-01-21 9:12 GMT+01:00 Cristian Sava <csava@xxxxxxxxxxxxxx>:
> > > I have a F23 server with minimal working X (no desktop).
> > > All was working well with kernel-4.2.x
> > > With kernel-4.3.x I get (in xterm):
> > > 
> > > [a53@s ~]$ su -c virt-manager
> > > Password: 
> > > [a53@s ~]$ No protocol specified
> > > Unable to init server: Could not connect: Connection refused
> > > (virt-manager:54862): Gtk-CRITICAL **:
> > > gtk_settings_get_for_screen:
> > > assertion 'GDK_IS_SCREEN (screen)' failed
> > > [a53@s ~]$ 
> > > 
> > > journalctl gives:
> > > 
> > > kernel: virt-manager[8896]: segfault at 0 ip 00007f612fce78a9 sp
> > > 00007ffe5a45e580 error 4 in libgtk-
> > > 3.so.0.1800.6[7f612fa2d000+710000]
> > > kernel: BUG: unable to handle kernel NULL pointer dereference at
> > > 0000000000000060
> > > 
> > > Searching the web I discovered that during years this error shows
> > > up
> > > from time to time across different distributions (including
> > > Fedora).
> > > This time it seems to be kernel related and does not show up with
> > > Gnome.
> > > 
> > > C.S
> > > 
> 
Tested with kernel-4.3.4 (x64 from koji) and the problem persist.

C.S.

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