os: plan9: sometimes stat has too short of a buffer

[gopherbot]

by mischief@offblast.org:

Before filing a bug, please check whether it has been fixed since the
latest release. Search the issue tracker and check that you're running the
latest version of Go:

Run "go version" and compare against
http://golang.org/doc/devel/release.html  If a newer version of Go exists,
install it and retry what you did to reproduce the problem.

Thanks.

What does 'go version' print?
go version devel +67bbd0083f7d Fri Sep 19 14:13:51 2014 -0700 plan9/amd64

What steps reproduce the problem?
If possible, include a link to a program on play.golang.org.

go test -v -a -run TestAll cmd/gofmt

What happened?

--- FAIL: TestAll (12.87s)
    long_test.go:106: stat /sys/src/go/.hg/store/data/doc/articles/go__concurrency__patterns__timing__out__moving__on.html.i: stat buffer too short
    long_test.go:106: stat /sys/src/go/.hg/store/data/src/crypto/tls/testdata/_client-_t_l_sv10-_client_cert-_e_c_d_s_a-_e_c_d_s_a.i: stat buffer too short
    long_test.go:106: stat /sys/src/go/.hg/store/data/src/crypto/tls/testdata/_client-_t_l_sv10-_client_cert-_e_c_d_s_a-_r_s_a.i: stat buffer too short
    long_test.go:106: stat /sys/src/go/.hg/store/data/src/crypto/tls/testdata/_client-_t_l_sv10-_client_cert-_r_s_a-_e_c_d_s_a.i: stat buffer too short

.....

What should have happened instead?
--- PASS: TestAll (11.96s)
PASS
ok      cmd/gofmt   11.968s

Please provide any additional information below.
stat_plan9.go always errors out if stat returns an error. stat on plan 9 can return an
error, but you must check the size of the buffer returned to determine if you should try
again with a larger stat buffer. it should do as plan 9 libc does.

[ianlancetaylor]

Comment 1:

Labels changed: added repo-main, release-none, os-plan9.

[gopherbot]

Comment 2:

CL https://golang.org/cl/150730043 mentions this issue.

[0intro]

Nick Owens submitted a fix for this issue.

https://codereview.appspot.com/150730043/

However, it wasn't merged in the tree.

[0intro]

CC @mischief