net: TestDialParallelSpuriousConnection failures

[gopherbot]

#!watchflakes
post <- pkg == "net" && test == "TestDialParallelSpuriousConnection"

Bug automatically created to track these flakes.

— watchflakes

[gopherbot]

Found new matching flaky dashboard failures for:

#!watchflakes
post <- pkg == "net" && test == "TestDialParallelSpuriousConnection"

2022-08-29 20:19 darwin-arm64-11 go@fd2ac5ef net.TestDialParallelSpuriousConnection (log)

--- FAIL: TestDialParallelSpuriousConnection (178.52s)
    dial_test.go:422: got read tcp6 [::1]:54749->[::1]:54967: i/o timeout; want EOF
panic: test timed out after 3m0s

goroutine 1188 [running]:
panic({0x10288ec00, 0x1400005d8c0})
	/tmp/buildlet/go/src/runtime/panic.go:987 +0x3c8 fp=0x14000056f80 sp=0x14000056ec0 pc=0x102659008
testing.(*M).startAlarm.func1()
	/tmp/buildlet/go/src/testing/testing.go:2064 +0x88 fp=0x14000056fd0 sp=0x14000056f80 pc=0x1026fed28
runtime.goexit()
	/tmp/buildlet/go/src/runtime/asm_arm64.s:1172 +0x4 fp=0x14000056fd0 sp=0x14000056fd0 pc=0x10268ca14
created by time.goFunc
	/tmp/buildlet/go/src/time/sleep.go:176 +0x38

— watchflakes