ubsan.test_longjmp_zero is failing

[sbc100]

For some reason this test fails, but only under ubsan:

Output:
start
longjmp
/usr/local/google/home/sbc/dev/wasm/emscripten/test/core/test_longjmp_zero.c:25:3: runtime error: execution reached an unreachable program point

Its like ubsan is inserting the its "does not return" check incorrectly somehow, because this function clearly isn't returning in practice.

[sbc100]

@aheejin not sure if this matters much?

[aheejin]

At least the program doesn't seem to leak, so I'm not sure why this fails. I guess some bugs in the library. Will try to investigate later (not sure when)...