@stephentyrone and other Apple peeps, poke: https://forums.developer.apple.com/thread/121887 - this seems it's super bad for anyone using AVX and clang, but it's been lingering for a while?
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Replying to @bmastenbrook
Ugh, that's ugly. Seems like no one bothered to file an actual bug report, unless I'm just not finding it, which doesn't help. I think this is an upstream clang change + combination of options that's almost unused in internal builds, so a near-perfect storm.
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Replying to @stephentyrone @bmastenbrook
The good news is that I'm having a hard time reproducing it with code that's any less ugly, so I think the conditions to trigger it are probably fairly contrived.
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The charm library triggers it; it’s very small, super simple and not contrived at all https://github.com/jedisct1/charm - The bug impacts dsvpn unless stack checking is disabled.
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