In our build infrastructure, I've seen a lot of segfaults recently that
were all only happening on OSX. Upon inspecting the coredumps, it
appearded that all segfaults happened at the same instruction, and upon
translating the assembly back to the source, I found that an array could
be indexed with a -1 index before the index was checked to be not -1.
As concrete evidence, here is the situation that I found caused the
segfault. The instruction in question along with the relevant register
values was:
mov (%r8,%r15,8),%r12
r8 = 0x7fb0ba800000
r15 = 0xffffffffffffffff
r8 + r15 * 8 == 0x7fb0ba7ffff8
It appears that the base of loop->watchers was page aligned, and by
going back one word I guess that the page wasn't mapped, causing our
segfaults.
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