net/http: flaky TestIdleConnChannelLeak

[bradfitz]

Flaky test seen on linux-amd64 at rev 947b6a7ec8e0

http://build.golang.org/log/ba81501397a2cf312dfcf83b4d32bfcbdc2fd03d

ok      mime/quotedprintable    0.195s
ok      net 2.532s
--- FAIL: TestIdleConnChannelLeak (0.00s)
    transport_test.go:1843: ForDisableKeepAlives = false, map size = 1; want 0
FAIL
FAIL    net/http    4.595s
ok      net/http/cgi    0.333s
ok      net/http/cookiejar  0.012s

[crawshaw]

This same error is happening frequently on the android-arm builder since I cleaned out its TMPDIR:

http://build.golang.org/log/b01531046245aead11b3269a2d601883b12f65c0

[bradfitz]

I've been unable to reproduce this. I've also read the code and can't see how it might occur.

There have been a number of fixes recently in the transport code, so hopefully one of those fixes also got this.

Please re-open if you see this again.

[crawshaw]

This appeared again this morning on linux-386, rev 3ca2021:

http://build.golang.org/log/9787432466e57bea66b3084a69f8a81a10603642

I still have no way to reliably reproduce it.

[gopherbot]

CL https://golang.org/cl/9561 mentions this issue.