Ok, with some help from mterry who is able to reproduce this quite
easily, it looks like we've determined that what happens is something in
set_disable_w_typing() writes 0x0 to the %ebx register and doesn't
restore its original contents (%ebx must be preserved by the callee as
per the SysV i386 ABI).

As %ebx is used to hold the base address of the GOT on i386, the next
call which goes via the PLT (which happens to be
gdk_device_manager_list_devices) crashes when trying to read the address
to jump to

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https://bugs.launchpad.net/bugs/1007588

Title:
  [mouse]: gnome-settings-daemon SIGSEGV in
  gdk_device_manager_list_devices@plt()

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