Just to close the loop entirely on this, as I showed the instructions
used when reading the pointer stored in arenas_map, here are the
instructions which write that value, which clearly show it writes to a
different address to the one read from:
5552: e8 39 ed ff ff call 4290 <arenas_extend>
5557: 8b 83 c4 01 00 00 mov 0x1c4(%ebx),%eax
555d: 8b 30 mov (%eax),%esi
555f: 85 f6 test %esi,%esi
5561: 0f 84 03 05 00 00 je 5a6a <.L488+0x14a>
5567: 65 a1 00 00 00 00 mov %gs:0x0,%eax
556d: 81 e8 04 00 00 00 sub $0x4,%eax
5573: 89 30 mov %esi,(%eax)
--
Firefox built with gcc-4.5 is a non-starter on i386
https://bugs.launchpad.net/bugs/663294
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