some tests fail for branch 7.5 on arm64

[dotstar-6]

Hi! I got some test failing (7 of 22) on arm64 am including the test-suite.log

test-suite.log

Was trying on some other release like above is using focal.

[carlosabalde]

Thanks for reporting, but for now the VMOD has only been tested and deployed on 64bit systems with Intel or AMD processors (x64). In any case, I'll try to take a look just in case is some kind of easy fix.

[carlosabalde]

@dotstar-6, first of all, sorry for taking so long to get back to you. I've been finally able to take a look at this today and I found two ARM64 issues breaking the automated tests:

• JSON encoding was inconsistent between ARM64 and x86_64 due to the different default signedness of the char type. Second time this year I've been bitten by this.

• Usage of Lua's Light Userdata to transport pointers between C and Lua code results in undefined behavior on architectures like ARM64.

Both of them have been fixed in branch fix-lua-lightuserdata-arm64, forked from master. I've tested it on a precarious emulated ARM64 environment and it seems to work fine. Could you please give it a try on your environment? Disclaimer: as I said, the VMOD has only been used in production on x86_64, so I can't guarantee you'll find no other issues on ARM64 :)