Public bug reported:
Under certain circumstances, the Mate-Control-Center Appearance window simply
segfaults when the font-tab is chosen.
Here is how to reproduce it (and work-around it).
1. Always open mate-appearance-properties from the CLI, rather than the
control-center - just to see the error message. When it does crash, it
always gives this line:
mate-appearance-properties: ../../../../src/cairo-scaled-font.c:459:
_cairo_scaled_glyph_page_destroy: Assertion `!scaled_font->cache_frozen' failed.
Aborted (core dumped)
2. To get back into a good state, (i.e. so that opening the font control
allows us to use it, rather than crash), do the following:
- Open appearance-properties
- Select one of the "good" themes. Experimentally, these include BlueMenta,
Quid, Fog, AlaDelta
- Go to the fonts tab (it doesn't now crash)
- Close appearance-properties window.
3. To make it crash:
- Open appearance-properties
- Select one of the "bad" themes. Experimentally, these include Ambiance,
Ambiant-Mate, Radiance, Radiant-Mate
- Go to the fonts tab (it doesn't (usually) crash this time)
- Close appearance-properties window.
- Open the appearance-properties window again
- Go to the fonts tab (it doesn't (usually) crash this time)
- It will segfault instantly.
I looked into specific cases that upset it, and the crash only happens
on certain choices of Fixed-width font:
- Terminus (my favourite for years) causes the crash (various font sizes:
6,9,17 all do)
- The others, don't seem to: I tried: Ubuntu Mono, Ubuntu Condensed,
Monospaced, Courier, Courier 10 Pitch, Courier New,
in other words, the following will cause a segfault: all conditions are
necessary
* One of the Ambience-derived themes
* The monospace-font being set to Terminus
* Opening the font-tab of mate-appearance-properties for the second time after
setting the theme.
I have these packages, running under Ubuntu Mate, on Wily 64-bit:
libfreetype6:amd64 2.5.2-4ubuntu1
mate-control-center 1.8.3+dfsg1-2
xfonts-terminus 4.39-1
libcairo2:amd64 1.14.2-2ubuntu1 (this is also the latest
release from upstream)
This is perhaps the weirdest bug I've ever tracked down... so I hope I've given
enough info to get this fixed.
** Affects: mate-control-center (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1464069
Title:
mate-appearance-properties segfaults on font-tab in certain cases
(Ambience + Terminus)
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