Arch Linux

Description:
A bug in the selected commit for testing/cairo (cairo-1.15.10+50+g14404ada8-1) causes frequent crashes in zathura and renders i3lock completely useless, as any key press crashes i3lock effectively unlocking the screen.

Example stack trace (cairo recompiled with debug symbols):

Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f0ccf799901 in free () from /usr/lib/libc.so.6
(gdb) bt
#0 0x00007f0ccf799901 in free () from /usr/lib/libc.so.6
#1 0x00007f0cd0fbf32a in _cairo_font_options_fini (options=<optimized out>)
at cairo-font-options.c:160
#2 0x00007f0cd10540ec in _cairo_ft_options_fini (options=0x56315fd6a358)
at cairo-ft-font.c:206
#3 _cairo_ft_font_face_destroy (abstract_face=0x56315fd6a320) at cairo-ft-font.c:3163
#4 0x00007f0cd0fbf006 in INT_cairo_font_face_destroy (font_face=0x56315fd6a320)
at cairo-font-face.c:186
#5 0x00007f0cd10133f4 in _cairo_toy_font_face_destroy (abstract_face=0x56315fd6d160)
at cairo-toy-font-face.c:371
#6 0x00007f0cd0fbf006 in INT_cairo_font_face_destroy (font_face=0x56315fd6d160)
at cairo-font-face.c:186
#7 0x00007f0cd0fc10da in _cairo_gstate_fini (gstate=0x56315fd799d0) at cairo-gstate.c:197
#8 0x00007f0cd0fbd116 in _cairo_default_context_fini (cr=0x56315fd799a0)
at cairo-default-context.c:75
#9 0x00007f0cd0fbd189 in _cairo_default_context_destroy (abstract_cr=0x56315fd799a0)
at cairo-default-context.c:93
#10 0x000056315f54ba21 in ?? ()
#11 0x000056315f54c2a8 in ?? ()
#12 0x000056315f54b6d0 in ?? ()
#13 0x00007f0ccfce04e3 in ev_invoke_pending () from /usr/lib/libev.so.4
#14 0x00007f0ccfce3ad6 in ev_run () from /usr/lib/libev.so.4
#15 0x000056315f548fd1 in ?? ()
#16 0x00007f0ccf737f4a in __libc_start_main () from /usr/lib/libc.so.6
#17 0x000056315f5493ca in ?? ()

The bug has been reported and resolved upstream: https://bugs.freedesktop.org/show_bug.cgi?id=105084

The commit that fixes the issue immediately follows the commit that testing/cairo is currently built from, and I have verified that using a more recent commit does fix zathura and i3lock.