x/net/netutil: TestLimitListener failures with "Client.Timeout exceeded while awaiting headers"

[bradfitz]

https://build.golang.org/log/b5964d8ee324ab1c9a0e36fd018bebe61a5ae09f

Out of fds? Timing/cancelation issues? @0intro?

ok  	golang.org/x/net/bpf	0.023s
ok  	golang.org/x/net/context	0.073s
?   	golang.org/x/net/context/ctxhttp	[no test files]
?   	golang.org/x/net/dict	[no test files]
ok  	golang.org/x/net/dns/dnsmessage	0.107s
ok  	golang.org/x/net/html	0.107s
ok  	golang.org/x/net/html/atom	0.016s
ok  	golang.org/x/net/html/charset	0.031s
ok  	golang.org/x/net/http/httpproxy	0.047s
*** Test killed: ran too long (10m0s).
FAIL	golang.org/x/net/http2	600.765s
ok  	golang.org/x/net/http2/hpack	0.023s
ok  	golang.org/x/net/icmp	0.026s
ok  	golang.org/x/net/idna	0.020s
?   	golang.org/x/net/internal/iana	[no test files]
?   	golang.org/x/net/internal/nettest	[no test files]
?   	golang.org/x/net/internal/socket	[no test files]
ok  	golang.org/x/net/internal/timeseries	0.025s
ok  	golang.org/x/net/ipv4	0.033s
ok  	golang.org/x/net/ipv6	0.027s
ok  	golang.org/x/net/lex/httplex	0.017s
ok  	golang.org/x/net/nettest	6.609s
netutil.test 567: warning: process exceeds 100 file descriptors
netutil.test 566: warning: process exceeds 200 file descriptors
--- FAIL: TestLimitListener (3.47s)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: EOF
	listen_test.go:55: Get http://127.0.0.1:44868: EOF
	listen_test.go:55: Get http://127.0.0.1:44868: EOF
	listen_test.go:55: Get http://127.0.0.1:44868: EOF
	listen_test.go:55: Get http://127.0.0.1:44868: EOF
	listen_test.go:55: Get http://127.0.0.1:44868: EOF
	listen_test.go:55: Get http://127.0.0.1:44868: EOF
	listen_test.go:55: Get http://127.0.0.1:44868: EOF
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:44868: EOF
	listen_test.go:68: 121 requests failed within 125 attempts
FAIL
FAIL	golang.org/x/net/netutil	3.514s
ok  	golang.org/x/net/proxy	0.231s
ok  	golang.org/x/net/publicsuffix	0.157s
ok  	golang.org/x/net/trace	0.035s
ok  	golang.org/x/net/webdav	3.880s
ok  	golang.org/x/net/webdav/internal/xml	0.030s
ok  	golang.org/x/net/websocket	4.551s
ok  	golang.org/x/net/xsrftoken	0.018s

[meirf]

A recent x/net build failure has occurred a couple of times recently, but doesn't appear to be new. See an older one here https://build.golang.org/log/149eb7b73916520a758e84d70bc3c3ec9da16705

The output is similar to the one bradfitz included above, but lacks the file descriptor mention. Unclear if they are the exact same issue.

--- FAIL: TestLimitListener (3.23s)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:55: Get http://127.0.0.1:34629: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
	listen_test.go:68: 131 requests failed within 256 attempts
FAIL
FAIL	golang.org/x/net/netutil	3.415s

[bcmills]

This failure mode is common on plan9, but also occurs less frequently on other builders (darwin and aix).

2021-01-19T19:43:25-5f4716e/plan9-386-0intro
2021-01-19T19:43:25-5f4716e/plan9-amd64-9front
2020-12-24T01:40:10-6772e93/plan9-386-0intro
2020-12-16T05:46:12-986b41b/plan9-386-0intro
2020-12-16T05:46:12-986b41b/plan9-amd64-9front
2020-12-09T12:38:23-ac852fb/plan9-386-0intro
2020-12-09T12:38:23-ac852fb/plan9-amd64-9front
2020-12-07T22:46:15-747e238/plan9-386-0intro
2020-12-07T22:46:15-747e238/plan9-amd64-9front
2020-12-02T16:19:06-c7110b5/plan9-386-0intro
2020-12-02T16:19:06-c7110b5/plan9-amd64-9front
2020-12-01T19:55:09-5d6afe9/plan9-amd64-9front
2020-11-10T03:11:24-69a7880/plan9-386-0intro
2020-11-10T03:11:24-69a7880/plan9-amd64-9front
2020-10-31T05:49:03-ff519b6/plan9-386-0intro
2020-10-31T05:49:03-ff519b6/plan9-amd64-9front
2020-10-29T22:17:08-28c70e6/darwin-amd64-10_12
2020-10-26T09:15:29-146b70c/plan9-386-0intro
2020-10-24T04:28:10-be3efd7/plan9-386-0intro
2020-10-21T03:54:29-f585440/plan9-386-0intro
2020-10-21T03:54:29-f585440/plan9-amd64-9front
2020-10-20T06:53:57-d65d470/plan9-386-0intro
2020-10-20T06:53:57-d65d470/plan9-amd64-9front
2020-10-16T16:51:38-7b1cca2/plan9-386-0intro
2020-10-16T16:51:38-7b1cca2/plan9-amd64-9front
2020-10-10T22:47:23-4f7140c/plan9-386-0intro
2020-10-10T22:47:23-4f7140c/plan9-amd64-9front
2020-10-09T03:24:41-dbdefad/plan9-386-0intro
2020-10-06T15:34:59-a7d1128/plan9-386-0intro
2020-10-02T20:24:02-0a1ea39/plan9-386-0intro
2020-09-30T14:50:03-4acb6c0/plan9-386-0intro
2020-09-04T19:48:48-62affa3/plan9-386-0intro
2020-08-22T12:43:28-c890458/plan9-386-0intro
2020-08-13T13:45:08-3edf25e/plan9-386-0intro
2020-06-25T00:16:55-4c52546/plan9-386-0intro
2020-06-02T11:40:24-627f964/plan9-386-0intro
2020-06-02T11:40:24-627f964/plan9-amd64-9front
2020-05-28T22:51:25-3c3fba1/plan9-386-0intro
2020-05-20T18:23:14-0ba52f6/plan9-386-0intro
2020-05-19T11:38:04-d87ec0c/plan9-386-0intro
2020-05-19T11:38:04-d87ec0c/plan9-amd64-9front
2020-05-13T18:57:01-a91f071/plan9-386-0intro
2020-05-13T18:57:01-a91f071/plan9-amd64-9front
2020-05-06T14:57:44-7e3656a/plan9-386-0intro
2020-05-05T04:18:28-1ed2336/plan9-386-0intro
2020-05-05T04:18:28-1ed2336/plan9-amd64-9front
2020-05-01T05:30:45-e0ff5e5/plan9-386-0intro
2020-05-01T05:30:45-e0ff5e5/plan9-amd64-9front
2020-04-25T23:01:54-ff2c4b7/plan9-386-0intro
2020-03-20T22:07:50-118fecf/plan9-386-0intro
2020-03-20T18:12:08-1c781a1/plan9-386-0intro
2020-03-01T02:21:30-244492d/plan9-386-0intro
2020-02-25T22:33:29-5d076fc/plan9-386-0intro
2020-02-22T03:33:25-078779b/plan9-386-0intro
2020-02-22T03:33:25-078779b/plan9-amd64-9front
2020-02-02T09:46:26-1617124/plan9-386-0intro
2020-01-14T15:54:13-6afb519/plan9-386-0intro
2019-12-09T16:08:50-c0dbc17/plan9-386-0intro
2019-11-24T23:23:54-b954d4e/plan9-386-0intro
2019-11-24T23:18:49-4163a4d/plan9-386-0intro
2019-11-19T07:31:36-fc4aabc/plan9-386-0intro
2019-11-18T18:34:10-d06c31c/plan9-386-0intro
2019-11-16T16:09:21-f9c8255/plan9-amd64-9front
2019-11-12T18:23:07-2180aed/plan9-386-0intro
2019-11-12T18:23:07-2180aed/plan9-amd64-9front
2019-11-01T17:50:33-0deb692/aix-ppc64
2019-10-28T08:55:09-fe3aa8a/aix-ppc64
2019-10-21T14:45:47-ec77196/darwin-amd64-10_14
2019-03-27T21:43:58-63eda1e/plan9-amd64-9front
2019-03-24T22:39:53-e3b2ff5/plan9-amd64-9front
2019-03-22T12:03:37-addf6b3/plan9-amd64-9front
2019-03-20T06:40:53-1272bf9/plan9-amd64-9front
2019-03-13T22:02:15-9f648a6/plan9-amd64-9front
2019-01-25T09:10:13-d26f9f9/plan9-386
2019-01-25T00:28:52-4b62a64/plan9-386
2019-01-19T20:41:37-ed066c8/plan9-386
2019-01-10T20:02:30-915654e/plan9-386
2019-01-10T04:46:37-be1c187/plan9-386
2019-01-08T22:56:52-1e06a53/plan9-386
2019-01-08T15:50:00-395948e/plan9-386
2019-01-08T15:08:41-be88a9a/plan9-386
2019-01-07T21:02:23-45ffb0c/plan9-386
2019-01-07T15:51:00-1a61f44/plan9-386
2019-01-07T15:50:40-a67830c/plan9-386
2018-12-20T20:33:05-927f977/plan9-386
2018-12-17T02:32:33-e147a91/plan9-386
2018-12-13T20:27:11-891ebc4/plan9-386
2018-12-07T15:40:23-6105869/plan9-386
2018-12-01T00:20:55-351d144/plan9-386
2018-11-29T05:56:19-fae4c4e/plan9-386
2018-11-14T22:03:01-adae6a3/plan9-386
2018-11-13T16:55:02-88d92db/plan9-386