Firefox + SeaMonkey (gecko browsers) instant crash on some web pages

[Miroslav Lachman]

Walter Schwarzenfeld wrote on 10/07/2015 00:35:
> Firefox 41.0.1 is out, give it a try.



I tried it in VirtualBox - same crash as with older versions.

In real host I got this (started ff from command line)

 > firefox

(process:77500): GLib-CRITICAL **: g_slice_set_config: assertion 
'sys_page_size == 0' failed
Assertion failed: (!scaled_font->cache_frozen), function 
_cairo_scaled_glyph_page_destroy, file cairo-scaled-font.c, line 459.
Abort


In VirtualBox on FreeBSD 10.2 with Firefox 41

 > firefox

(process:5471): GLib-CRITICAL **: g_slice_set_config: assertion 
'sys_page_size == 0' failed
Fontconfig warning: "local.conf", line 1093: saw number, expected matrix
libGL error: Calling driver entry point failed
libGL error: reverting to software direct rendering
libGL error: failed to load driver: vboxvideo
ATTENTION: default value of option force_s3tc_enable overridden by 
environment.
Assertion failed: (!scaled_font->cache_frozen), function 
_cairo_scaled_glyph_page_destroy, file cairo-scaled-font.c, line 459.
Redirecting call to abort() to mozalloc_abort

Segmentation fault


First line with GLib-CRITICAL is shown on Firefox startup and is not 
related to crash on www.mapy.cz

The "cairo scaled" error is something I saw in the past with some other 
software, like GIMP or Avidemux. GIMP and Avidemux are not able to even 
start on my computer if I have Helvetica as system default font.
Firefox and Seamonkey works fine until I need to open www.seznam.cz, 
www.mapy.cz and other websites from this company.

I tried it on host with differen font (Arial) and Firefox crashed again.

 > firefox

(process:79336): GLib-CRITICAL **: g_slice_set_config: assertion 
'sys_page_size == 0' failed
Assertion failed: (!scaled_font->cache_frozen), function 
_cairo_scaled_glyph_page_destroy, file cairo-scaled-font.c, line 459.
Redirecting call to abort() to mozalloc_abort


###!!! [Parent][MessageChannel] Error: Channel error: cannot send/recv

Assertion failed: (!scaled_font->cache_frozen), function 
_cairo_scaled_glyph_page_destroy, file cairo-scaled-font.c, line 459.
Abort

So the crash is not related to choosen default font.

Miroslav Lachman