Golang x/sys/unix: TestMmapPtr fails with "Munmap: invalid argument" on GOOS=openbsd

This functionality and test was recently added in CL 592415. It fails on GOOS=openbsd specifically:

=== RUN   TestMmapPtr
    mmap_unix_test.go:72: Munmap: invalid argument
--- FAIL: TestMmapPtr (0.00s)

(From https://ci.chromium.org/b/8744139430297328801.)

CC @golang/openbsd, @ncruces.

Comment From: gabyhelp

Similar Issues

• x/sys/unix: TestMremapPtr fails with "MremapPtr: cannot allocate memory" on GOOS=netbsd #68180

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Comment From: gopherbot

Change https://go.dev/cl/595095 mentions this issue: unix: fix MmapPtr test failing on OpenBSD

Comment From: ncruces

So this should be fixed in https://github.com/golang/sys/pull/199

I ran a GitHub action on a branch that stacks both fixes, and all tests pass on: - linux - darwin - freebsd - openbsd - netbsd - illumos

So, hopefully, this doesn't cause any more issues.