[Spice-devel] crashes / Assertion `uxa_pixmap_is_offscreen(src_pixmap)' failed

[Christophe Fergeau]

On Tue, May 02, 2017 at 01:46:20PM +0200, Daniel Pocock wrote:
> 
> 
> On 02/05/17 12:43, Christophe Fergeau wrote:
> > On Tue, May 02, 2017 at 11:39:08AM +0200, Daniel Pocock wrote:
> >> 
> >> 
> >> Hi,
> >> 
> >> I've observed that the Xorg process in my virtual server
> >> sometimes crashes when I launch Firefox.  Xorg.0.log had an error
> >> about "Out of video memory: Could not allocate 7274816 bytes", so
> >> I increased video RAM from 64MB to 256MB.  On the last crash the
> >> error about memory was not there, but I found this at the end of
> >> Xorg.0.log:
> >> 
> >> [170197.066] qxl_surface_create: Bad bpp: 1 (1) [170197.076]
> >> qxl_surface_create: Bad bpp: 1 (1) [170228.641]
> >> qxl_surface_create: Bad bpp: 1 (1) [170281.094]
> >> qxl_surface_create: Bad bpp: 1 (1) [170281.641]
> >> qxl_surface_create: Bad bpp: 1 (1)
> > 
> > These ones keep happening I think, and are harmless
> > 
> >> 
> >> and in journalctl I found:
> >> 
> >> gdm-Xorg-:0[1538]: qxl_surface_create: Bad bpp: 1 (1) 
> >> iceweasel.desktop[4967]: Gtk-Message: Failed to load module 
> >> "canberra-gtk-module" gdm-Xorg-:0[1538]: qxl_surface_create: Bad
> >> bpp: 1 (1) gdm-Xorg-:0[1538]: qxl_surface_create: Bad bpp: 1 (1) 
> >> gdm-Xorg-:0[1538]: Xorg: ../../../src/uxa/uxa-glyphs.c:991: 
> >> uxa_glyphs_via_mask: Assertion
> >> `uxa_pixmap_is_offscreen(src_pixmap)' failed.
> >> 
> >> at the moment of the crash.  I opened a Debian bug[1] with that
> >> error.
> > 
> > Would you have a core file when that happens?
> > 
> 
> Not yet, but I'd be happy to try and get one.  Would you be able to
> suggest how I tweak my system to generate core files for the Xorg
> process?  Should I just replace the Xorg binary with a wrapper script
> or is there a more official way to do it by modifying
> /lib/systemd/system/gdm3.service or something else?

On my f26 system, coredumpctl is just magic to grab coredumps, but I
don't know how much integration work is needed. An alternative is to
run a screen/tmux, and attach gdb to the running Xorg process in there,
and switch to a VT once it crashed (hopefully this should be possible).
Or I guess you can just enable core generation system-wide, and grab it
in the location where it landed (this is defined in /proc/xxx)

Christophe
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