#1122241 golang-github-valyala-fasthttp: flaky test: FAIL: TestConfigFastOpen TestConfigBacklog: tcplisten_test.go:70: cannot create listener 0 using Config &tcplisten.Config{ReusePort:true, DeferAccept:true, FastOpen:true, Backlog:0}: cannot bind to "[::1]:10083": address already in use

Package:
golang-github-valyala-fasthttp
Source:
golang-github-valyala-fasthttp
Submitter:
Simon Josefsson
Date:
2026-07-27 19:35:01 UTC
Severity:
normal
#1122241#5
Date:
2025-12-09 07:30:10 UTC
From:
To:
Hi!  This package appears to have a flaky test, or at least it doesn't
show up always, and only seen on ppc64el:

https://ci.debian.net/packages/g/golang-github-valyala-fasthttp/testing/ppc64el/66899753/

This is holding up testing migration for golang-go.crypto right now, but
I'm scheduling another debci run of this, which hopefully will make it
go away.

/Simon

187s === RUN   TestConfigFastOpen
187s     tcplisten_test.go:105: 208. timeout when waiting for response: %!s(<nil>)
187s --- FAIL: TestConfigFastOpen (1.35s)
187s === RUN   TestConfigAll
187s     tcplisten_test.go:70: cannot create listener 0 using Config &tcplisten.Config{ReusePort:true, DeferAccept:true, FastOpen:true, Backlog:0}: cannot bind to "[::1]:10083": address already in use
187s --- FAIL: TestConfigAll (1.26s)
187s === RUN   TestConfigBacklog
187s     tcplisten_test.go:105: 703. timeout when waiting for response: %!s(<nil>)
187s --- FAIL: TestConfigBacklog (1.61s)
187s FAIL
187s FAIL	github.com/valyala/fasthttp/tcplisten	10.730s
#1122241#10
Date:
2026-05-25 21:20:00 UTC
From:
To:
I noticed another flaky test, on s390x:

https://ci.debian.net/packages/g/golang-github-valyala-fasthttp/testing/s390x/71559612/#L3223

112s === NAME  TestRevertPull1233
112s     client_test.go:3691: Not Expected status code 418
112s --- PASS: TestCloseOnShutdown (0.54s)
112s --- FAIL: TestRevertPull1233 (0.06s)

/Simon
#1122241#15
Date:
2026-06-13 05:47:19 UTC
From:
To:
I noticed another flaky test, on amd64, so I suspect some generic issue
with many self-tests in this package.

https://ci.debian.net/packages/g/golang-github-valyala-fasthttp/testing/amd64/71981641/#L2976

100s === NAME  TestClientHeadWithBody
100s     client_test.go:3629: timeout
100s --- FAIL: TestClientHeadWithBody (0.01s)

/Simon
#1122241#20
Date:
2026-06-13 05:49:06 UTC
From:
To:
Another failure on riscv64:

https://ci.debian.net/packages/g/golang-github-valyala-fasthttp/testing/riscv64/71982756/#L2795

1198s === NAME  TestDirFSFSCompressConcurrent
1198s     fs_fs_test.go:816: timeout
1198s --- FAIL: TestDirFSFSCompressConcurrent (2.00s)

https://ci.debian.net/packages/g/golang-github-valyala-fasthttp/testing/riscv64/71982756/#L2894

1198s === NAME  TestFSFSCompressConcurrent
1198s     fs_fs_test.go:360: timeout
1198s --- FAIL: TestFSFSCompressConcurrent (4.00s)

/Simon
#1122241#25
Date:
2026-07-27 19:32:49 UTC
From:
To:
Hi.  Flaky tests noticed again with version 1:1.72.0-1, this time
holding up testing migration of golang-golang-x-net.

https://ci.debian.net/packages/g/golang-github-valyala-fasthttp/testing/s390x/73805358/#L4114

245s === RUN   TestConfigFastOpen
245s     tcplisten_test.go:105: 202. timeout when waiting for response: %!s(<nil>)
245s --- FAIL: TestConfigFastOpen (0.33s)
245s === RUN   TestConfigAll
245s     tcplisten_test.go:70: cannot create listener 0 using Config &tcplisten.Config{ReusePort:true, DeferAccept:true, FastOpen:true, Backlog:0}: cannot bind to "localhost:10083": address already in use
245s --- FAIL: TestConfigAll (0.00s)
245s === RUN   TestConfigBacklog
245s     tcplisten_test.go:70: cannot create listener 0 using Config &tcplisten.Config{ReusePort:false, DeferAccept:false, FastOpen:false, Backlog:32}: cannot bind to "localhost:10083": address already in use
245s --- FAIL: TestConfigBacklog (0.11s)
245s FAIL
245s FAIL	github.com/valyala/fasthttp/tcplisten	4.147s

/Simon