runtime: TLS slot index over 64 and crash [1.20 backport]

[gopherbot]

@qmuntal requested issue #59213 to be considered for backport to the next 1.20 minor release.

@gopherbot please backport to Go 1.20

[dmitshur]

@qmuntal Thanks for requesting this backport. The next step here is to create a cherry-pick CL following the https://go.dev/wiki/MinorReleases#making-cherry-pick-cls process.

CL 486816 backports to release-branch.go1.20 mostly cleanly, except not the change in the src/runtime/sys_windows_386.s file. I think it's because CL 454675 only happened in Go 1.21. Should the cherry-pick CL to 1.20 leave out the change to sys_windows_386.s, or do you suggest a different path for this backport? Thanks.

[qmuntal]

Should the cherry-pick CL to 1.20 leave out the change to sys_windows_386.s, or do you suggest a different path for this backport? Thanks.

I've submitted the cherry-pick leaving the sys_windows_386 out of it, as it does not apply. Thanks for the detailed explanation.

[gopherbot]

Change https://go.dev/cl/504475 mentions this issue: [release-branch.go1.20] runtime: fallback to TEB arbitrary pointer when TLS slots are full

[qmuntal]

CL is ready, it just needs to be submitted. I don't have permissions to submit to a release branch.