build: netbsd-386 builds hang during make.bash

[bradfitz]

The netbsd-386 builds hang during make.bash somewhere.

I'm disabling them from the builders for now, since the build coordinator doesn't yet deal with that well.

/cc @mdempsky @ianlancetaylor @bsiegert

[bradfitz]

(These are gomote accessible if anybody wants to reproduce. I'm not disabling that part. The actual host is a NetBSD 7.0 amd64 image, using GOARCH=386 / GOHOSTARCH=386, which gomote will set for you if you create a netbsd-386-70 image)

[gopherbot]

CL https://golang.org/cl/37622 mentions this issue.

[bradfitz]

I updated the NetBSD builders to NetBSD 7.1.

Maybe something was fixed. We'll see.

/cc @bsiegert

[bradfitz]

I guess we should document in the Release Notes' Known Issues section (https://tip.golang.org/doc/go1.9#known_issues) about NetBSD not being stable and kick this to Go 1.10.

Sound okay @mdempsky, @bsiegert, @ianlancetaylor?

[bradfitz]

I just attached to the serial console of a netbsd-386-71 builder while running make.bash hoping to catch a NetBSD kernel panic like in #20836 but no luck.

I see nothing to the serial port, but the build hangs at:

##### Building packages and commands for netbsd/386.
...
cmd/trace
cmd/vendor/github.com/google/pprof/internal/proftest
cmd/vet/internal/cfg
cmd/vet/internal/whitelist
cmd/vet
                                   
^C
bradfitz@gdev:~/go$ 
bradfitz@gdev:~/go$ gomote run $MOTE go/bin/go version
go version devel gomote.XXXXX netbsd/386

Note that the machine is still usable after killing the make.bash run.

Trying it again, it hangs in a different place:

##### Building packages and commands for netbsd/386.
...
runtime/race
vendor/golang_org/x/text/secure
vendor/golang_org/x/text/unicode
cmd/compile/internal/test
cmd/vet/internal/whitelist

Looking at the GCE console, I see it's using 99% CPU.

[gopherbot]

CL https://golang.org/cl/47036 mentions this issue.

[zoulasc]

What are the steps to reproduce this?

[bradfitz]

@zoulasc, set GOARCH=386, cd into your Go checkout's src/ directory, and then run ./make.bash and watch it spin.

We run NetBSD 7.1 VMs on GCE (KVM, virtio, etc), if that matters.

Our image is built using https://github.com/golang/build/tree/master/env/netbsd-amd64