runtime: "program exceeds 50-thread limit" in test of os package on darwin-arm-mg912baios [1.13 backport] #34712
Description
@odeke-em requested issue #32326 to be considered for backport to the next 1.13 minor release.
Some great news, @minux's CL https://go-review.googlesource.com/c/go/+/197938 fixed this issue in that change from entersyscallblock() to entersyscall() so we'll need to backport Minux's CL to both Go1.12 and Go1.13 as per https://groups.google.com/d/msg/golang-dev/UYDTDWHJsC8/a1_4KiKnCwAJ.
@gopherbot please backport this issue to Go1.12 and Go1.13.