@vtjnash would you mind if I rewrite jl_swap_fiber and related function to operate on tasks instead of contexts?, so that instead of littering the ASAN support throughout the code base it is in one place? Similar to how Folly does this facebook/folly@2ea64dd

I should also note that this is not yet complete, since ASAN is still not happy so I most likely missed a switch.

Sure, however you feel is convenient. I settled on this API to emphasize that it is expected to only access this field. But it’s not a hard restriction.

Seems good

It turns out that the issue I was experiencing was a seqfault in

and not that we have to annotate setjmp/longjmp that we use for exception handling (since we don't change stacks).
(Nathan and I did that successfully today at 2e831f2)

Haha oops. Wellllll, it was fun anyway! 😂 And an interesting exercise!

Causes this compiler warning:

In file included from /home/jeff/src/julia/src/rtutils.c:23:0:
/home/jeff/src/julia/src/julia.h:95:20: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
 static inline void sanitizer_finish_switch_fiber() {}
                    ^
/home/jeff/src/julia/src/julia.h: In function ‘sanitizer_finish_switch_fiber’:
/home/jeff/src/julia/src/julia.h:95:20: warning: old-style function definition [-Wold-style-definition]

Sorry about that, noticed it after merging.

I have included a fix in #33259