net/http: apparent TestServerAllowsBlockingRemoteAddr flakes due to hard-coded timeouts #36179

bcmills · 2019-12-17T15:19:35Z

#!watchflakes
post <- pkg == "net/http" && (test == "TestServerAllowsBlockingRemoteAddr" || `^\s+TestServerAllowsBlockingRemoteAddr \(\d+m`) && (`panic: test timed out` || `context deadline exceeded`)

2019-12-16T20:38:31-f7f9866/plan9-386-0intro
2019-06-12T14:58:18-65f53da/plan9-amd64-9front

--- FAIL: TestServerAllowsBlockingRemoteAddr (1.08s)
    serve_test.go:1300: Request 1: Get "http://127.0.0.1:55517": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
    serve_test.go:1349: response 1 addr = ""; want "RA:21.21.21.21:21"
http.test 1018696: warning: process exceeds 100 file descriptors
FAIL
FAIL	net/http	114.189s

As far as I can tell, the root cause is the hard-coded time.Second here:

go/src/net/http/serve_test.go

Lines 1326 to 1330 in 931fe39

    
           select { 
        
           case conn2 = <-conns: 
        
           case <-time.After(time.Second): 
        
           	t.Fatal("Second Accept didn't happen") 
        
           }

It's not obvious to me why a timeout is needed there at all. If the test deadlocks, we presumably want a goroutine dump anyway.

CC @bradfitz @0intro @fhs

The text was updated successfully, but these errors were encountered:

bcmills · 2019-12-17T15:19:57Z

That's the regression test for #12943.

howjmay · 2020-02-29T05:20:14Z

Is this one still one still open

bcmills · 2023-01-31T16:07:57Z

The failure log linked in #57995 (comment) matches this issue; I'm not sure why watchflakes isn't posting it here.

gopherbot · 2023-01-31T20:34:31Z

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && (test == "TestServerAllowsBlockingRemoteAddr" || `^\s+TestServerAllowsBlockingRemoteAddr \(\d+m`) && (`panic: test timed out` || `context deadline exceeded`)

2023-01-17 18:12 dragonfly-amd64-622 go@c0799f70 net/http (log)

1 second passes in backend, proxygone= false
panic: test timed out after 3m0s
running tests:
	TestServerAllowsBlockingRemoteAddr (2m59s)
	TestServerAllowsBlockingRemoteAddr/h1 (2m54s)

goroutine 21276 [running]:
panic({0x848280, 0xc00018a8b0})
	/tmp/workdir/go/src/runtime/panic.go:987 +0x3bb fp=0xc000653f10 sp=0xc000653e50 pc=0x436b7b
testing.(*M).startAlarm.func1()
	/tmp/workdir/go/src/testing/testing.go:2241 +0x3b9 fp=0xc000653fe0 sp=0xc000653f10 pc=0x4fd339
runtime.goexit()
	/tmp/workdir/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000653fe8 sp=0xc000653fe0 pc=0x46b201
created by time.goFunc
	/tmp/workdir/go/src/time/sleep.go:176 +0x32

— watchflakes

gopherbot · 2023-02-24T23:22:35Z

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && (test == "TestServerAllowsBlockingRemoteAddr" || `^\s+TestServerAllowsBlockingRemoteAddr \(\d+m`) && (`panic: test timed out` || `context deadline exceeded`)

2023-02-24 19:16 dragonfly-amd64-622 go@8e5f56a2 net/http (log)

panic: test timed out after 3m0s
running tests:
	TestServerAllowsBlockingRemoteAddr (3m0s)
	TestServerAllowsBlockingRemoteAddr/h1 (2m57s)

goroutine 21822 [running]:
panic({0x821680?, 0xc00108c720?})
	/tmp/workdir/go/src/runtime/panic.go:1015 +0x3ac fp=0xc000627f10 sp=0xc000627e60 pc=0x43564c
testing.(*M).startAlarm.func1()
	/tmp/workdir/go/src/testing/testing.go:2244 +0x3b4 fp=0xc000627fe0 sp=0xc000627f10 pc=0x4f7554
runtime.goexit()
	/tmp/workdir/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000627fe8 sp=0xc000627fe0 pc=0x4693c1
created by time.goFunc
	/tmp/workdir/go/src/time/sleep.go:176 +0x2d

— watchflakes

bcmills · 2023-02-25T01:36:14Z

Interesting! Those dragonfly failures look like actual deadlocks, not just spurious timeouts.

bcmills · 2023-02-27T18:57:24Z

Nope, it is still the same spurious timeout:
https://cs.opensource.google/go/go/+/master:src/net/http/serve_test.go;l=1362;drc=133e0bca0be23980604ee98589ddcacdb1262afd

It's just manifesting as a deadlock due to some synchronous cleanup code.

gopherbot · 2023-02-27T23:52:53Z

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && (test == "TestServerAllowsBlockingRemoteAddr" || `^\s+TestServerAllowsBlockingRemoteAddr \(\d+m`) && (`panic: test timed out` || `context deadline exceeded`)

2023-02-27 22:37 darwin-amd64-13 go@5cded8b3 net/http (log)

panic: test timed out after 3m0s
running tests:
	TestServerAllowsBlockingRemoteAddr (2m59s)
	TestServerAllowsBlockingRemoteAddr/h1 (2m42s)

goroutine 21340 [running]:
panic({0x1421c00?, 0xc0012fd4d0?})
	/tmp/buildlet/go/src/runtime/panic.go:1015 +0x3ac fp=0xc00038ef10 sp=0xc00038ee60 pc=0x10347ac
testing.(*M).startAlarm.func1()
	/tmp/buildlet/go/src/testing/testing.go:2244 +0x3b4 fp=0xc00038efe0 sp=0xc00038ef10 pc=0x10f6e74
runtime.goexit()
	/tmp/buildlet/go/src/runtime/asm_amd64.s:1598 +0x1 fp=0xc00038efe8 sp=0xc00038efe0 pc=0x1069981
created by time.goFunc
	/tmp/buildlet/go/src/time/sleep.go:176 +0x2d

— watchflakes

gopherbot · 2023-03-08T18:18:14Z

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && (test == "TestServerAllowsBlockingRemoteAddr" || `^\s+TestServerAllowsBlockingRemoteAddr \(\d+m`) && (`panic: test timed out` || `context deadline exceeded`)

2023-03-01 21:23 freebsd-arm-paulzhol go@09852e75 net/http.TestServerAllowsBlockingRemoteAddr (log)

--- FAIL: TestServerAllowsBlockingRemoteAddr (0.00s)
    --- FAIL: TestServerAllowsBlockingRemoteAddr/h1 (1.15s)
        serve_test.go:1333: Request 1: Get "http://127.0.0.1:53309": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
        serve_test.go:1382: response 1 addr = ""; want "RA:21.21.21.21:21"

— watchflakes

gopherbot · 2023-03-08T22:12:24Z

Change https://go.dev/cl/474582 mentions this issue: net/http: remove arbitrary timeout in TestServerAllowsBlockingRemoteAddr

gopherbot · 2023-03-13T19:45:49Z

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && (test == "TestServerAllowsBlockingRemoteAddr" || `^\s+TestServerAllowsBlockingRemoteAddr \(\d+m`) && (`panic: test timed out` || `context deadline exceeded`)

2023-03-13 18:55 dragonfly-amd64-622 go@778627f3 net/http.TestServerAllowsBlockingRemoteAddr (log)

--- FAIL: TestServerAllowsBlockingRemoteAddr (0.00s)
    --- FAIL: TestServerAllowsBlockingRemoteAddr/h1 (1.01s)
        serve_test.go:1333: Request 1: Get "http://127.0.0.1:64872": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
        serve_test.go:1376: response 1 addr = ""; want "RA:21.21.21.21:21"

— watchflakes

bcmills · 2023-03-13T20:01:42Z

Oops, missed another arbitrary timeout.

gopherbot · 2023-03-13T20:45:30Z

Change https://go.dev/cl/476035 mentions this issue: net/http: remove more arbitrary timeouts from server tests

This change eliminates the easy, arbitrary timouts that should never happen. It leaves in place a couple of more complicated ones that will probably need retry loops for robustness. For #49336. For #36179. Change-Id: I657ef223a66461413a915da5ce9150f49acec04a Reviewed-on: https://go-review.googlesource.com/c/go/+/476035 Run-TryBot: Bryan Mills <bcmills@google.com> Auto-Submit: Bryan Mills <bcmills@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Damien Neil <dneil@google.com>

bcmills · 2023-03-13T21:24:52Z

Hopefully completely fixed this time, by CL 476035.

gopherbot · 2024-04-12T22:49:02Z

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && (test == "TestServerAllowsBlockingRemoteAddr" || `^\s+TestServerAllowsBlockingRemoteAddr \(\d+m`) && (`panic: test timed out` || `context deadline exceeded`)

2024-04-03 15:35 android-386-emu go@d8392e69 net/http (log)

panic: test timed out after 3m0s
running tests:
	Test304Responses (2m58s)
	TestBadResponseAfterReadingBody (2m58s)
	TestBidiStreamReverseProxy (2m58s)
	TestCancelRequestMidBody (2m58s)
	TestCancelRequestWhenSharingConnection (2m59s)
	TestCancelRequestWithChannel (2m59s)
	TestCancelRequestWithChannelBeforeDo_Cancel (2m59s)
	TestCancelRequestWithChannelBeforeDo_Context (2m59s)
...
	TestWriteHeader0 (2m58s)
	TestWriteHeaderNoCodeCheck (2m58s)
	TestWriteHeaderSwitchingProtocols (2m59s)
	TestZeroLengthPostAndResponse (2m59s)

goroutine 24228 [running]:
testing.(*M).startAlarm.func1()
	/workdir/go/src/testing/testing.go:2259 +0x3e1
created by time.goFunc
	/workdir/go/src/time/sleep.go:176 +0x35

2024-04-03 18:01 android-386-emu go@74501172 net/http (log)

panic: test timed out after 3m0s
running tests:
	Test304Responses (2m58s)
	TestBadResponseAfterReadingBody (2m58s)
	TestBidiStreamReverseProxy (2m58s)
	TestCancelRequestMidBody (2m58s)
	TestChunkedResponseHeaders (2m58s)
	TestClient (2m58s)
	TestClientAltersCookiesOnRedirect (2m58s)
	TestClientCallsCloseOnlyOnce (2m58s)
...
	TestWriteDeadlineExtendedOnNewRequest (2m58s)
	TestWriteHeader0 (2m58s)
	TestWriteHeaderNoCodeCheck (2m58s)
	TestZeroLengthPostAndResponse (2m58s)

goroutine 31241 [running]:
testing.(*M).startAlarm.func1()
	/workdir/go/src/testing/testing.go:2259 +0x3e1
created by time.goFunc
	/workdir/go/src/time/sleep.go:176 +0x35

— watchflakes

bcmills added Testing An issue that has been verified to require only test changes, not just a test failure. help wanted NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Dec 17, 2019

bcmills added this to the Backlog milestone Dec 17, 2019

bcmills mentioned this issue Jan 26, 2023

net/http: unrecognized failures #57600

Closed

bcmills added this to Test Flakes Jan 26, 2023

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bcmills mentioned this issue Jan 26, 2023

Testing packages.: unrecognized failures #57995

Closed

gopherbot closed this as completed in d6fa0d2 Mar 8, 2023

github-project-automation bot moved this to Done in Test Flakes Mar 8, 2023

bcmills removed the help wanted label Mar 9, 2023

bcmills self-assigned this Mar 9, 2023

bcmills modified the milestones: Backlog, Go1.21 Mar 9, 2023

gopherbot reopened this Mar 13, 2023

bcmills closed this as completed Mar 13, 2023

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gopherbot reopened this Apr 12, 2024

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dmitshur added NeedsFix The path to resolution is known, but the work has not been done. and removed NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels May 30, 2024

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net/http: apparent TestServerAllowsBlockingRemoteAddr flakes due to hard-coded timeouts #36179

net/http: apparent TestServerAllowsBlockingRemoteAddr flakes due to hard-coded timeouts #36179

bcmills commented Dec 17, 2019 •

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net/http: apparent TestServerAllowsBlockingRemoteAddr flakes due to hard-coded timeouts #36179

net/http: apparent TestServerAllowsBlockingRemoteAddr flakes due to hard-coded timeouts #36179

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