net/http: TestServerShutdownStateNew is flaky #26233
Description
Two recent failures on linux-amd64-longtest:
https://build.golang.org/log/ef73c0ec3463104a804cba25d4b550a403db26b9
https://build.golang.org/log/6e2a1f6b524c1c8d2f794bce1bae272c87a62ef7
--- FAIL: TestServerShutdownStateNew (2.00s)
serve_test.go:5603: shutdown too soon after 49.41µs
serve_test.go:5617: timeout waiting for Read to unblock
FAIL
FAIL net/http 37.294s
The test accepts shutdowns between 0.5x and 1.5x the expected amount, which is 5s. The result of not even a millisecond seems to point that the test completely breaks, as opposed to this being a timing issue. Looking into it.
/cc @bradfitz