@Chris - It looks like your hypothesis was correct.
I've rebuilt gnome-settings-daemon with DEB_BUILD_OPTIONS="noopt
nostrip" to get a full stack trace, and filed a new crash report as bug
692149. Here's the popup_menu_set_group stack frame showing group_number
> g:
#5 0x00007f4cb00667b0 in popup_menu_set_group (item=0x0, param=0x2) at
gsd-keyboard-xkb.c:391
shortnames = 0x1f8ef70
lname = 0x1f8f050 "USA"
ln2cnt_map = 0x1f8f9e0
guide = 0x7f4cb006a507 "XXX"
longnames = 0x1f8f0c0
layout_name = 0x1 <Address 0x1 out of bounds>
group_number = 2
engine = 0x1650f80
st = 0x165ba4c
cur = 96469911
__func__ = "popup_menu_set_group"
xklrec = 0x1f16900
registry = 0x1f8f2e0
g = 1
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https://bugs.launchpad.net/bugs/685785
Title:
gnome-settings-daemon crashed with SIGSEGV in __libc_free()
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