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cmd/go: test timeouts waiting for os/exec copying goroutines #50187

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bcmills opened this issue Dec 15, 2021 · 8 comments
Closed

cmd/go: test timeouts waiting for os/exec copying goroutines #50187

bcmills opened this issue Dec 15, 2021 · 8 comments
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FrozenDueToAge GoCommand cmd/go NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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Go1.20

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bcmills commented Dec 15, 2021 •
edited by rsc
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#!watchflakes
post <- pkg == "cmd/go" && `panic: test timed out` && `os/exec.\(\*Cmd\)\.Wait` && `cmd/go.*waitOrStop`

greplogs --dashboard -md -l -e '(?ms)\Anetbsd-[a-z0-9_-]+-n2 .*cmd/go_test\.waitOrStop' --since=2021-11-01

This looks superficially like #48789, but the goroutine containing os/exec.(*Cmd).Wait has made it past the call to c.Process.Wait, and is blocked waiting for the copying goroutines:
https://cs.opensource.google/go/go/+/master:src/os/exec/exec.go;l=515;drc=2580d0e08d5e9f979b943758d3c49877fb2324cb

That makes this actually an instance of #23019, which we probably need to work around in order to figure out why the cmd/go subprocess seems to be deadlocked. (cmd/go doesn't intentionally forward stdout or stderr to any subprocess, so there may be some other issue here as well, but we should at least get what we can out of the subprocess to help diagnose it.)

2021-12-14T01:48:22-1afa432/netbsd-amd64-9_0-n2

goroutine 3694 [IO wait, 8 minutes]:
runtime.gopark(0xc0003dda00?, 0xc000036a00?, 0xc8?, 0x75?, 0x47cb99?)
	/tmp/workdir/go/src/runtime/proc.go:366 +0xd6 fp=0xc000597558 sp=0xc000597538 pc=0x438c96
runtime.netpollblock(0xc0009c2000?, 0x8000?, 0x0?)
	/tmp/workdir/go/src/runtime/netpoll.go:453 +0xf3 fp=0xc000597590 sp=0xc000597558 pc=0x432133
internal/poll.runtime_pollWait(0x7f7ff7a4f798, 0x72)
	/tmp/workdir/go/src/runtime/netpoll.go:233 +0x89 fp=0xc0005975b0 sp=0xc000597590 pc=0x462529
internal/poll.(*pollDesc).wait(0xc00092a480?, 0xc0009c2000?, 0x1)
	/tmp/workdir/go/src/internal/poll/fd_poll_runtime.go:83 +0x32 fp=0xc0005975d8 sp=0xc0005975b0 pc=0x49ad72
internal/poll.(*pollDesc).waitRead(...)
	/tmp/workdir/go/src/internal/poll/fd_poll_runtime.go:88
internal/poll.(*FD).Read(0xc00092a480, {0xc0009c2000, 0x8000, 0x8000})
	/tmp/workdir/go/src/internal/poll/fd_unix.go:167 +0x25a fp=0xc000597658 sp=0xc0005975d8 pc=0x49c0da
os.(*File).read(...)
	/tmp/workdir/go/src/os/file_posix.go:31
os.(*File).Read(0xc000208a78, {0xc0009c2000?, 0xc0001fb540?, 0xc000597760?})
	/tmp/workdir/go/src/os/file.go:119 +0x5e fp=0xc0005976b0 sp=0xc000597658 pc=0x4a639e
io.copyBuffer({0xbd4300, 0xc0001fb540}, {0xbd4180, 0xc000208a78}, {0x0, 0x0, 0x0})
	/tmp/workdir/go/src/io/io.go:426 +0x1b2 fp=0xc000597730 sp=0xc0005976b0 pc=0x497832
io.Copy(...)
	/tmp/workdir/go/src/io/io.go:385
os/exec.(*Cmd).writerDescriptor.func1()
	/tmp/workdir/go/src/os/exec/exec.go:311 +0x3a fp=0xc000597790 sp=0xc000597730 pc=0x55111a
os/exec.(*Cmd).Start.func1(0xc000564c00?)
	/tmp/workdir/go/src/os/exec/exec.go:441 +0x25 fp=0xc0005977c8 sp=0xc000597790 pc=0x551f45
os/exec.(*Cmd).Start.func3()
	/tmp/workdir/go/src/os/exec/exec.go:442 +0x2a fp=0xc0005977e0 sp=0xc0005977c8 pc=0x551eea
runtime.goexit()
	/tmp/workdir/go/src/runtime/asm_amd64.s:1571 +0x1 fp=0xc0005977e8 sp=0xc0005977e0 pc=0x467f61
created by os/exec.(*Cmd).Start
	/tmp/workdir/go/src/os/exec/exec.go:440 +0x715

goroutine 561 [chan receive, 8 minutes]:
runtime.gopark(0x440ec0?, 0xc00019f950?, 0xc0?, 0x89?, 0x9bff3b?)
	/tmp/workdir/go/src/runtime/proc.go:366 +0xd6 fp=0xc000919b20 sp=0xc000919b00 pc=0x438c96
runtime.chanrecv(0xc0000d4960, 0x0, 0x1)
	/tmp/workdir/go/src/runtime/chan.go:577 +0x56c fp=0xc000919bb0 sp=0xc000919b20 pc=0x407b4c
runtime.chanrecv1(0xc0002a7e00?, 0x0?)
	/tmp/workdir/go/src/runtime/chan.go:440 +0x18 fp=0xc000919bd8 sp=0xc000919bb0 pc=0x407578
cmd/go_test.(*testScript).cmdExec(0xc0002a7e00, {0x0, 0x0}, {0xc00019f8c0, 0x3, 0x3})
	/tmp/workdir/go/src/cmd/go/script_test.go:766 +0x285 fp=0xc000919c48 sp=0xc000919bd8 pc=0x9bca25
cmd/go_test.(*testScript).cmdGo(0xa23f00?, {0x0, 0x0}, {0xc00080f900?, 0x2?, 0x1?})
	/tmp/workdir/go/src/cmd/go/script_test.go:828 +0x11c fp=0xc000919cb8 sp=0xc000919c48 pc=0x9bd39c
cmd/go_test.(*testScript).run(0xc0002a7e00)
	/tmp/workdir/go/src/cmd/go/script_test.go:420 +0x689 fp=0xc000919ed8 sp=0xc000919cb8 pc=0x9b9069
cmd/go_test.TestScript.func1(0xc000598820)
	/tmp/workdir/go/src/cmd/go/script_test.go:96 +0x1f4 fp=0xc000919f70 sp=0xc000919ed8 pc=0x9b7a14
testing.tRunner(0xc000598820, 0xc000564c00)
	/tmp/workdir/go/src/testing/testing.go:1410 +0x102 fp=0xc000919fc0 sp=0xc000919f70 pc=0x5141e2
testing.(*T).Run.func1()
	/tmp/workdir/go/src/testing/testing.go:1457 +0x2a fp=0xc000919fe0 sp=0xc000919fc0 pc=0x51508a
runtime.goexit()
	/tmp/workdir/go/src/runtime/asm_amd64.s:1571 +0x1 fp=0xc000919fe8 sp=0xc000919fe0 pc=0x467f61
created by testing.(*T).Run
	/tmp/workdir/go/src/testing/testing.go:1457 +0x35f

goroutine 3695 [IO wait, 8 minutes]:
runtime.gopark(0xc000598d00?, 0xc000036a00?, 0xc8?, 0x75?, 0x47cb99?)
	/tmp/workdir/go/src/runtime/proc.go:366 +0xd6 fp=0xc0003d7558 sp=0xc0003d7538 pc=0x438c96
runtime.netpollblock(0xc0009ca000?, 0x8000?, 0x0?)
	/tmp/workdir/go/src/runtime/netpoll.go:453 +0xf3 fp=0xc0003d7590 sp=0xc0003d7558 pc=0x432133
internal/poll.runtime_pollWait(0x7f7ff7a4f140, 0x72)
	/tmp/workdir/go/src/runtime/netpoll.go:233 +0x89 fp=0xc0003d75b0 sp=0xc0003d7590 pc=0x462529
internal/poll.(*pollDesc).wait(0xc00092a540?, 0xc0009ca000?, 0x1)
	/tmp/workdir/go/src/internal/poll/fd_poll_runtime.go:83 +0x32 fp=0xc0003d75d8 sp=0xc0003d75b0 pc=0x49ad72
internal/poll.(*pollDesc).waitRead(...)
	/tmp/workdir/go/src/internal/poll/fd_poll_runtime.go:88
internal/poll.(*FD).Read(0xc00092a540, {0xc0009ca000, 0x8000, 0x8000})
	/tmp/workdir/go/src/internal/poll/fd_unix.go:167 +0x25a fp=0xc0003d7658 sp=0xc0003d75d8 pc=0x49c0da
os.(*File).read(...)
	/tmp/workdir/go/src/os/file_posix.go:31
os.(*File).Read(0xc000208a90, {0xc0009ca000?, 0xc0001fb560?, 0xc0003d7760?})
	/tmp/workdir/go/src/os/file.go:119 +0x5e fp=0xc0003d76b0 sp=0xc0003d7658 pc=0x4a639e
io.copyBuffer({0xbd4300, 0xc0001fb560}, {0xbd4180, 0xc000208a90}, {0x0, 0x0, 0x0})
	/tmp/workdir/go/src/io/io.go:426 +0x1b2 fp=0xc0003d7730 sp=0xc0003d76b0 pc=0x497832
io.Copy(...)
	/tmp/workdir/go/src/io/io.go:385
os/exec.(*Cmd).writerDescriptor.func1()
	/tmp/workdir/go/src/os/exec/exec.go:311 +0x3a fp=0xc0003d7790 sp=0xc0003d7730 pc=0x55111a
os/exec.(*Cmd).Start.func1(0xc00039e4c0?)
	/tmp/workdir/go/src/os/exec/exec.go:441 +0x25 fp=0xc0003d77c8 sp=0xc0003d7790 pc=0x551f45
os/exec.(*Cmd).Start.func3()
	/tmp/workdir/go/src/os/exec/exec.go:442 +0x2a fp=0xc0003d77e0 sp=0xc0003d77c8 pc=0x551eea
runtime.goexit()
	/tmp/workdir/go/src/runtime/asm_amd64.s:1571 +0x1 fp=0xc0003d77e8 sp=0xc0003d77e0 pc=0x467f61
created by os/exec.(*Cmd).Start
	/tmp/workdir/go/src/os/exec/exec.go:440 +0x715

goroutine 3696 [chan receive, 2 minutes]:
runtime.gopark(0x18?, 0xf1ed60?, 0x0?, 0xc0?, 0x0?)
	/tmp/workdir/go/src/runtime/proc.go:366 +0xd6 fp=0xc000597e10 sp=0xc000597df0 pc=0x438c96
runtime.chanrecv(0xc00092a600, 0xc000597f20, 0x1)
	/tmp/workdir/go/src/runtime/chan.go:577 +0x56c fp=0xc000597ea0 sp=0xc000597e10 pc=0x407b4c
runtime.chanrecv1(0xc00002de00?, 0x38?)
	/tmp/workdir/go/src/runtime/chan.go:440 +0x18 fp=0xc000597ec8 sp=0xc000597ea0 pc=0x407578
os/exec.(*Cmd).Wait(0xc000824160)
	/tmp/workdir/go/src/os/exec/exec.go:515 +0x188 fp=0xc000597f40 sp=0xc000597ec8 pc=0x552168
cmd/go_test.waitOrStop({0xbd8d08?, 0xc00091d740}, 0xc000824160, {0xbd73e8?, 0xbd06c0}, 0x646b83877)
	/tmp/workdir/go/src/cmd/go/script_test.go:1288 +0x137 fp=0xc000597f90 sp=0xc000597f40 pc=0x9c0417
cmd/go_test.(*testScript).startBackground.func1()
	/tmp/workdir/go/src/cmd/go/script_test.go:1161 +0x4d fp=0xc000597fe0 sp=0xc000597f90 pc=0x9c004d
runtime.goexit()
	/tmp/workdir/go/src/runtime/asm_amd64.s:1571 +0x1 fp=0xc000597fe8 sp=0xc000597fe0 pc=0x467f61
created by cmd/go_test.(*testScript).startBackground
	/tmp/workdir/go/src/cmd/go/script_test.go:1160 +0x43b

goroutine 3697 [chan send, 2 minutes]:
runtime.gopark(0x47cbb2?, 0x47ab18?, 0x25?, 0x0?, 0x50e6?)
	/tmp/workdir/go/src/runtime/proc.go:366 +0xd6 fp=0xc000443e28 sp=0xc000443e08 pc=0x438c96
runtime.chansend(0xc0000d49c0, 0xc000443f80, 0x1, 0xc000443eb8?)
	/tmp/workdir/go/src/runtime/chan.go:258 +0x425 fp=0xc000443eb0 sp=0xc000443e28 pc=0x406ca5
runtime.chansend1(0xc000443f90?, 0xbd73e8?)
	/tmp/workdir/go/src/runtime/chan.go:144 +0x1d fp=0xc000443ee0 sp=0xc000443eb0 pc=0x40685d
cmd/go_test.waitOrStop.func1()
	/tmp/workdir/go/src/cmd/go/script_test.go:1285 +0x2cf fp=0xc000443fe0 sp=0xc000443ee0 pc=0x9c07af
runtime.goexit()
	/tmp/workdir/go/src/runtime/asm_amd64.s:1571 +0x1 fp=0xc000443fe8 sp=0xc000443fe0 pc=0x467f61
created by cmd/go_test.waitOrStop
	/tmp/workdir/go/src/cmd/go/script_test.go:1250 +0x12d
@bcmills bcmills added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Dec 15, 2021
@bcmills bcmills added this to the Backlog milestone Dec 15, 2021
@bcmills bcmills self-assigned this Dec 15, 2021
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bcmills commented Dec 15, 2021

The underlying hang seems likely to be related to #50138, but we should still fix the waitOrStop helper.

@bcmills bcmills mentioned this issue Dec 16, 2021
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bcmills commented Feb 4, 2022

greplogs --dashboard -md -l -e '(?ms)\Anetbsd-[^ ]+ .*cmd/go_test\.waitOrStop' --since=2021-12-16

2022-02-03T22:55:24-248ad85/netbsd-amd64-9_0
2022-01-11T18:17:05-a20724d/netbsd-amd64-9_0-n2d
2022-01-07T17:55:52-98ed916/netbsd-386-9_0-n2d
2022-01-07T00:15:59-07525e1/netbsd-386-9_0-n2d
2022-01-06T22:12:11-b9cae6f/netbsd-amd64-9_0-n2d
2022-01-04T22:05:15-e39ab9b/netbsd-amd64-9_0-n2d
2021-12-17T03:28:06-3c49583/netbsd-386-9_0-n2d

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bcmills commented Feb 4, 2022

Lacking a fix for #23019, progress on this is probably gated on #50436.

(I don't see that it would be worth shimming os/exec with a workaround when we can probably fix os/exec directly in some form.)

@bcmills bcmills mentioned this issue Apr 25, 2022
Closed
@bcmills bcmills changed the title cmd/go: hang in waitOrStop on netbsd-amd64-9_0-n2 cmd/go: test timeouts waiting for os/exec copying goroutines Sep 6, 2022
@bcmills bcmills modified the milestones: Backlog, Go1.20 Sep 6, 2022
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bcmills commented Sep 6, 2022

greplogs -l -e 'panic: test timed out.*\n\n(?:goroutine .*:\n(?:.+\n\t.+\n)+\n)*goroutine \d+ \[chan receive, \d+ minutes\]:\n(?:.+\n\t.+\n)*runtime\.chanrecv.*\n\t.+\nos/exec\.\(\*Cmd\)\.Wait.*\n\t.+\ncmd/go.*\.waitOrStop' --since=2022-01-01
2022-07-06T19:34:57-2f43de6/windows-amd64-longtest
2022-07-01T15:37:46-9a4d535/windows-amd64-longtest
2022-06-06T15:42:19-47e34ca/windows-amd64-longtest
2022-05-26T22:25:23-55c42c2/windows-amd64-longtest
2022-05-20T23:37:43-0a1a092/linux-amd64-longtest
2022-05-20T23:37:43-0a1a092/windows-amd64-longtest
2022-05-20T23:05:38-c3470ca/linux-amd64-longtest
2022-05-20T23:05:38-c3470ca/windows-amd64-longtest
2022-05-20T22:30:37-2b0e457/linux-amd64-longtest
2022-05-20T22:30:37-2b0e457/windows-amd64-longtest
2022-05-20T21:54:20-b580670/linux-amd64-longtest
2022-05-20T21:54:20-b580670/windows-amd64-longtest
2022-05-20T21:32:57-7ec6ef4/linux-amd64-longtest
2022-05-20T21:32:57-7ec6ef4/windows-amd64-longtest
2022-02-03T22:55:24-248ad85/netbsd-amd64-9_0

@bcmills bcmills added the GoCommand cmd/go label Sep 6, 2022
@bcmills bcmills mentioned this issue Sep 20, 2022
Open
@rsc rsc added this to Test Flakes Sep 20, 2022
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gopherbot commented Sep 20, 2022 •
edited by rsc
Loading

Found new matching dashboard test flakes for:

#!watchflakes
post <- pkg == "cmd/go" && `panic: test timed out` && `os/exec.\(\*Cmd\)\.Wait` && `cmd/go.*waitOrStop`
2022-09-19 13:56 linux-amd64-longtest go@fc1cddcf cmd/go.TestScript (log) 
go test proxy running at GOPROXY=http://127.0.0.1:43059/mod
panic: test timed out after 45m0s

runtime.gopark(0x4432e0?, 0xc001503800?, 0x20?, 0x55?, 0xa0f99b?)
	/workdir/go/src/runtime/proc.go:375 +0xd6 fp=0xc000153b18 sp=0xc000153af8 pc=0x43ae76
runtime.chanrecv(0xc000e4f200, 0x0, 0x1)
	/workdir/go/src/runtime/chan.go:583 +0x49d fp=0xc000153ba8 sp=0xc000153b18 pc=0x40877d
runtime.chanrecv1(0xc0001cb900?, 0x0?)
	/workdir/go/src/runtime/chan.go:442 +0x18 fp=0xc000153bd0 sp=0xc000153ba8 pc=0x408278
cmd/go_test.(*testScript).cmdExec(0xc0001cb900, {0x0, 0x0}, {0xc000f56a80, 0x6, 0x6})
	/workdir/go/src/cmd/go/script_test.go:823 +0x29f fp=0xc000153c40 sp=0xc000153bd0 pc=0xa0c05f
cmd/go_test.(*testScript).cmdGo(0xa7b780?, {0x0, 0x0}, {0xc000d9c680?, 0x5?, 0x1?})
	/workdir/go/src/cmd/go/script_test.go:885 +0x105 fp=0xc000153cb0 sp=0xc000153c40 pc=0xa0c9e5
cmd/go_test.(*testScript).run(0xc0001cb900)
	/workdir/go/src/cmd/go/script_test.go:462 +0x823 fp=0xc000153ed0 sp=0xc000153cb0 pc=0xa08763
cmd/go_test.TestScript.func1(0xc0000d5380)
	/workdir/go/src/cmd/go/script_test.go:97 +0x20f fp=0xc000153f70 sp=0xc000153ed0 pc=0xa068af
testing.tRunner(0xc0000d5380, 0xc000638640)

— watchflakes

@rsc rsc moved this to Active in Test Flakes Sep 20, 2022
This was referenced Sep 21, 2022
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Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "cmd/go" && `panic: test timed out` && `os/exec.\(\*Cmd\)\.Wait` && `cmd/go.*waitOrStop`
2022-10-24 15:56 linux-amd64-longtest go@decdad35 cmd/go.TestScript (log) 
go test proxy running at GOPROXY=http://127.0.0.1:40341/mod
panic: test timed out after 45m0s

runtime.gopark(0x443ee0?, 0xc0004028a0?, 0x80?, 0x13?, 0xa1a57b?)
	/workdir/go/src/runtime/proc.go:378 +0xd6 fp=0xc000881b00 sp=0xc000881ae0 pc=0x43b9f6
runtime.chanrecv(0xc00070f620, 0x0, 0x1)
	/workdir/go/src/runtime/chan.go:583 +0x49d fp=0xc000881b90 sp=0xc000881b00 pc=0x408a9d
runtime.chanrecv1(0xc0001b4dc0?, 0x0?)
	/workdir/go/src/runtime/chan.go:442 +0x18 fp=0xc000881bb8 sp=0xc000881b90 pc=0x408598
cmd/go_test.(*testScript).cmdExec(0xc0001b4dc0, {0x0, 0x0}, {0xc0008c4f00, 0x6, 0x6})
	/workdir/go/src/cmd/go/script_test.go:850 +0x29f fp=0xc000881c28 sp=0xc000881bb8 pc=0xa16c3f
cmd/go_test.(*testScript).cmdGo(0xa86b20?, {0x0, 0x0}, {0xc0001d2480?, 0x5?, 0x1?})
	/workdir/go/src/cmd/go/script_test.go:912 +0x105 fp=0xc000881c98 sp=0xc000881c28 pc=0xa175c5
cmd/go_test.(*testScript).run(0xc0001b4dc0)
	/workdir/go/src/cmd/go/script_test.go:489 +0x823 fp=0xc000881ed0 sp=0xc000881c98 pc=0xa131a3
cmd/go_test.TestScript.func1(0xc0001611e0)
	/workdir/go/src/cmd/go/script_test.go:98 +0x20f fp=0xc000881f70 sp=0xc000881ed0 pc=0xa1104f
testing.tRunner(0xc0001611e0, 0xc000432b80)

— watchflakes

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Change https://go.dev/cl/445357 mentions this issue: cmd/go/internal/script: use the Cancel and WaitDelay fields for subprocesses

gopherbot pushed a commit that referenced this issue Oct 26, 2022
cmd/go/internal/script: use the Cancel and WaitDelay fields for subpr…
49abdbc 
…ocesses

The Cancel and WaitDelay fields recently added to exec.Cmd are
intended to support exactly the sort of cancellation behavior that we
need for script tests. Use them, and simplify the cmd/go tests
accordingly.

The more robust implementation may also help to diagose recurring test
hangs (#50187).

For #50187.
Updates #27494.

Change-Id: I7817fca0dd9a18e18984a252d3116f6a5275a401
Reviewed-on: https://go-review.googlesource.com/c/go/+/445357
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
romaindoumenc pushed a commit to TroutSoftware/go that referenced this issue Nov 3, 2022
@romaindoumenc
cmd/go/internal/script: use the Cancel and WaitDelay fields for subpr…
40b550c 
…ocesses

The Cancel and WaitDelay fields recently added to exec.Cmd are
intended to support exactly the sort of cancellation behavior that we
need for script tests. Use them, and simplify the cmd/go tests
accordingly.

The more robust implementation may also help to diagose recurring test
hangs (golang#50187).

For golang#50187.
Updates golang#27494.

Change-Id: I7817fca0dd9a18e18984a252d3116f6a5275a401
Reviewed-on: https://go-review.googlesource.com/c/go/+/445357
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
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bcmills commented Dec 7, 2022

Fixed by CL 445357.

@bcmills bcmills closed this as completed Dec 7, 2022
Repository owner moved this from Active to Done in Test Flakes Dec 7, 2022
@golang golang locked and limited conversation to collaborators Dec 7, 2023
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