net/http: timeout in TestServerHijackGetsBackgroundByte_big

[mknyszek]

#!watchflakes
post <- pkg == "net/http" && test == "TestServerHijackGetsBackgroundByte_big" && log ~ `panic: test timed out`

2022-09-02T18:51:37-5b1fbfb/darwin-arm64-12

CC @neild

[bcmills]

Given that it's darwin/arm64, could be related to #37795/#50254 and/or #54529?

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && test == "TestServerHijackGetsBackgroundByte_big"

2022-09-02 18:51 darwin-arm64-12 go@5b1fbfba net/http.TestServerHijackGetsBackgroundByte_big (log)

panic: test timed out after 3m0s

runtime.gopark(0x103176fa0?, 0x0?, 0x0?, 0x0?, 0x102a5eb30?)
	/tmp/buildlet/go/src/runtime/proc.go:363 +0xe4 fp=0x140002c0dd0 sp=0x140002c0db0 pc=0x1029fff94
runtime.chanrecv(0x140003323c0, 0x0, 0x1)
	/tmp/buildlet/go/src/runtime/chan.go:583 +0x45c fp=0x140002c0e60 sp=0x140002c0dd0 pc=0x1029ce8cc
runtime.chanrecv1(0x1400072c020?, 0x1400072c020?)
	/tmp/buildlet/go/src/runtime/chan.go:442 +0x14 fp=0x140002c0e90 sp=0x140002c0e60 pc=0x1029ce434
net/http_test.TestServerHijackGetsBackgroundByte_big(0x1400040a4e0)
	/tmp/buildlet/go/src/net/http/serve_test.go:6028 +0x29c fp=0x140002c0f60 sp=0x140002c0e90 pc=0x102d105bc
testing.tRunner(0x1400040a4e0, 0x102efd308)

— watchflakes