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
Did you report it? seems like someone forgot to check the pointer before accessing it.
2016-01-21 9:12 GMT+01:00 Cristian Sava csava@central.ucv.ro:
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
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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@central.ucv.ro:
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
Weird. I've been using virt-manager with kernel 4.3.3 and 4.4.0 on Fedora 23 for some time without problems. Maybe check AVC messages?
ausearch -m AVC
Maybe it's worth relabeling:
restorecon -rv /
I don't know why but even after a clean install and no updates, restorecon fixes labels. It's like they aren't set correctly to start with for some reason. And then after any update I run it and it fixes more things each time. Kinda annoying really. I don't feel like I ought to need to relabel manually after every update. Maybe more than one label is valid, just that one is more valid than another and that's why the install label is sometimes different from post-install label.
Chris Murphy
On Thu, 2016-01-21 at 12:22 -0700, Chris Murphy wrote:
Weird. I've been using virt-manager with kernel 4.3.3 and 4.4.0 on Fedora 23 for some time without problems. Maybe check AVC messages?
ausearch -m AVC
Maybe it's worth relabeling:
restorecon -rv /
I don't know why but even after a clean install and no updates, restorecon fixes labels. It's like they aren't set correctly to start with for some reason. And then after any update I run it and it fixes more things each time. Kinda annoying really. I don't feel like I ought to need to relabel manually after every update. Maybe more than one label is valid, just that one is more valid than another and that's why the install label is sometimes different from post-install label.
How is this related to the topic of this thread?
poc
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@central.ucv.ro:
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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Chris Murphy -
Cristian Sava -
Patrick O'Callaghan -
thibaut noah