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os: spurious SIGCHILD on running child process [1.24 backport] #71849

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gopherbot opened this issue Feb 20, 2025 · 5 comments
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os: spurious SIGCHILD on running child process [1.24 backport] #71849

gopherbot opened this issue Feb 20, 2025 · 5 comments
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CherryPickApproved Used during the release process for point releases
Milestone
Go1.24.1

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@gopherbot
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@ianlancetaylor requested issue #71828 to be considered for backport to the next 1.24 minor release.

@gopherbot Please open backport issues.

This bug causes a spurious SIGCHLD signal the first time a process is executed when running on Linux systems. This is a regression from past behavior and from behavior on non-Linux systems. The patch is small and safe.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Feb 20, 2025
@gopherbot gopherbot mentioned this issue Feb 20, 2025
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@gopherbot gopherbot added this to the Go1.24.1 milestone Feb 20, 2025
@gopherbot
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Change https://go.dev/cl/651035 mentions this issue: [release-branch.go1.24] syscall: don't send child signal when testing pidfd

@gopherbot
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Change https://go.dev/cl/651476 mentions this issue: [release-branch.go1.24] runtime: use WCLONE when waiting on pidfd test child

@prattmic
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https://go.dev/cl/651035 contains a bug, which is fixed by https://go.dev/cl/651035, so both must be cherry-picked together.

@prattmic prattmic added the CherryPickApproved Used during the release process for point releases label Feb 26, 2025
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Feb 26, 2025
gopherbot pushed a commit that referenced this issue Feb 26, 2025
@ianlancetaylor @prattmic
[release-branch.go1.24] syscall: don't send child signal when testing…
d418e22 
… pidfd

Avoid a spurious SIGCHLD the first time we start a process.

For #71828
Fixes #71849

Change-Id: I744100d21bf6aaaaafc99bc5eec9f9f807a50682
Reviewed-on: https://go-review.googlesource.com/c/go/+/651035
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
gopherbot pushed a commit that referenced this issue Feb 26, 2025
@prattmic
[release-branch.go1.24] runtime: use WCLONE when waiting on pidfd tes…
becc17e 
…t child

As of CL 650835, the pidfd test child no longer sends SIGCHLD on exit.
Per clone(2), "If [the child termination] signal is specified as
anything other than SIGCHLD, then the parent process must specify the
__WALL or __WCLONE options when waiting for the child with wait(2)."

Align with this requirement.

For #71849.
For #71828.

Change-Id: I6a6a636c739e4a59abe1533fe429a433e8588939
Reviewed-on: https://go-review.googlesource.com/c/go/+/651415
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
(cherry picked from commit e1e65ae)
Reviewed-on: https://go-review.googlesource.com/c/go/+/651476
@gopherbot
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Closed by merging CL 651476 (commit becc17e) to release-branch.go1.24.

@gopherbot
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Closed by merging CL 651035 (commit d418e22) to release-branch.go1.24.

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