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x/net/ipv4: deadlock in TestPacketConnConcurrentReadWriteUnicast #51342

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bcmills opened this issue Feb 24, 2022 · 3 comments
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x/net/ipv4: deadlock in TestPacketConnConcurrentReadWriteUnicast #51342

bcmills opened this issue Feb 24, 2022 · 3 comments
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FrozenDueToAge help wanted NeedsFix The path to resolution is known, but the work has not been done. release-blocker Testing An issue that has been verified to require only test changes, not just a test failure.
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Go1.19

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@bcmills
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bcmills commented Feb 24, 2022 •
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Looks like exactly the same failure mode as in #50455, but for the ipv4 package instead of ipv6.

That probably means we can just port over CL 376094 and CL 376095 to the ipv4 package. We may also want to audit whether any other ipv6 test fixes should be ported to ipv4.

greplogs --dashboard -md -l -e '(?ms)panic: test timed out.*\nsync\.\(\*WaitGroup\)\.Wait.*\n\t.*\ngolang\.org/x/net/ipv4_test.testPacketConnConcurrentReadWriteUnicast'

2022-02-24T00:04:18-cd36cc0-78e9976/freebsd-amd64-13_0
@bcmills bcmills added Testing An issue that has been verified to require only test changes, not just a test failure. help wanted NeedsFix The path to resolution is known, but the work has not been done. labels Feb 24, 2022
@gopherbot gopherbot added this to the Unreleased milestone Feb 24, 2022
@bcmills
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bcmills commented Feb 24, 2022

Marking as release-blocker for Go 1.19 due to the similarity to #50455, which was observed on darwin/amd64 (a first-class port).

@bcmills bcmills modified the milestones: Unreleased, Go1.19 Feb 24, 2022
@bcmills bcmills self-assigned this Feb 24, 2022
@gopherbot
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Change https://go.dev/cl/387915 mentions this issue: ipv4: shut down the PacketConn on failure in TestPacketConnConcurrentReadWriteUnicast

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Change https://go.dev/cl/387916 mentions this issue: ipv6: retry ENOBUFS errors in TestPacketConnConcurrentReadWriteUnicast

gopherbot pushed a commit to golang/net that referenced this issue Feb 25, 2022
ipv4: shut down the PacketConn on failure in TestPacketConnConcurrent…
f80d34d 
…ReadWriteUnicast

This avoids a deadlock (observed in golang/go#51342) that may
otherwise swallow the error logs from a failure, which may help us
better diagnose the underlying problem.

This is a port of CL 376094 to the "ipv4" package.

For golang/go#51342

Change-Id: I7b5ba25fcbdd1ec0b319fe35b558d9dcbf8054c6
Reviewed-on: https://go-review.googlesource.com/c/net/+/387915
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
@bcmills bcmills mentioned this issue Jun 15, 2022
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@rsc rsc unassigned bcmills Jun 22, 2022
@bcmills bcmills mentioned this issue Nov 4, 2022
Open
WeiminShang added a commit to WeiminShang/net that referenced this issue Nov 16, 2022
@WeiminShang
ipv4: shut down the PacketConn on failure in TestPacketConnConcurrent…
6eaf168 
…ReadWriteUnicast

This avoids a deadlock (observed in golang/go#51342) that may
otherwise swallow the error logs from a failure, which may help us
better diagnose the underlying problem.

This is a port of CL 376094 to the "ipv4" package.

For golang/go#51342

Change-Id: I7b5ba25fcbdd1ec0b319fe35b558d9dcbf8054c6
Reviewed-on: https://go-review.googlesource.com/c/net/+/387915
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
WeiminShang added a commit to WeiminShang/net that referenced this issue Nov 16, 2022
@WeiminShang
ipv4: retry ENOBUFS errors in TestPacketConnConcurrentReadWriteUnicast
8d770ea 
This change is sheer speculation based on the failures observed in
golang/go#37319.

(A deadlock in the test prevented us from seeing the actual failure
mode of golang/go#51342 up until CL 387915, and it isn't obvious to me
that we should wait for another failure before trying a likely — and
otherwise harmless — fix.)

This is a port of CL 376095 to the "ipv4" package.

Fixes golang/go#51342.
(Maybe.)

Change-Id: Idd6d2d785dbb0c98404f99bd98a3c4ddc11cb2cf
Reviewed-on: https://go-review.googlesource.com/c/net/+/387916
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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