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runtime: usleep() does not work on Linux 386 #21518

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pvoicu opened this issue Aug 18, 2017 · 8 comments
Closed

runtime: usleep() does not work on Linux 386 #21518

pvoicu opened this issue Aug 18, 2017 · 8 comments
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Go1.9

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@pvoicu
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pvoicu commented Aug 18, 2017

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go1.8.3 linux/386

What operating system and processor architecture are you using (go env)?

GOARCH="386"
GOHOSTARCH="386"
GOHOSTOS="linux"
GOOS="linux"

What did you do?

It is internal function to the runtime package, so I cannot provide a test code to reproduce.
To reproduce, someone needs to compile any application for linux/386 and strace the second thread

What did you expect to see?

pselect6(0, NULL, NULL, NULL, {0, 20000}, 0) = 0 (Timeout)

What did you see instead?

I see pselect6(0, NULL, NULL, NULL, {0, 0}, 0) = 0 (Timeout)

runtime.usleep always sets the nanosecond parameter to 0. The fix is at line https://go.googlesource.com/go/+/master/src/runtime/sys_linux_386.s#103, it should be "MOVL AX, 4(SP)".
@ALTree
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ALTree commented Aug 18, 2017 •
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The CL that changed the linked function was not originally in go1.8, but it was cherrypicked here: https://go-review.googlesource.com/c/44002

It's also in go1.9rc2.

cc @aclements

@ALTree ALTree added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Aug 18, 2017
@gopherbot
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Change https://golang.org/cl/56850 mentions this issue: runtime: fix usleep by correctly setting nanoseconds parameter for pselect6

@ALTree ALTree changed the title runtime.usleep() does not work on Linux 386 runtime: usleep() does not work on Linux 386 Aug 18, 2017
@ianlancetaylor ianlancetaylor added this to the Go1.9 milestone Aug 18, 2017
@aclements
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Re-opening for cherry-pick to release branch.

@aclements aclements reopened this Aug 18, 2017
@gopherbot
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Change https://golang.org/cl/56891 mentions this issue: [release-branch.go1.9] runtime: fix usleep by correctly setting nanoseconds parameter for pselect6

@aclements aclements removed the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Aug 18, 2017
@aclements
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Cherry-pick to 1.8.4 is issue #21520.

Thanks for finding this @pvoicu!

gopherbot pushed a commit that referenced this issue Aug 18, 2017
@pvoicu @aclements
[release-branch.go1.9] runtime: fix usleep by correctly setting nanos…

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etu Elis Hirwing
GPG key ID: D57EFA625C9A925F
Verified
Learn about vigilant mode
65717b2 
…econds parameter for pselect6

Fixes #21518

Change-Id: Idd67e3f0410d0ce991b34dcc0c8f15e0d5c529c9
Reviewed-on: https://go-review.googlesource.com/56891
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Petrica Voicu <pvoicu@paypal.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
@ALTree
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ALTree commented Aug 18, 2017

go1.9 cherrypick was merged: http://golang.org/cl/56891, so I'm closing this.

@ALTree ALTree closed this as completed Aug 18, 2017
@tsuna
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tsuna commented Aug 25, 2017

Thanks for fixing this bug, I was going crazy over runtime.sysmon taking up to 50% of the CPU cycles in my profiles as of late, and I thought it was something stupid we did in our own code that caused it. Today I realized the issue didn't exist in go1.8.2 and earlier, and didn't exist in go1.9 either, and traced it back to this issue.

@gopherbot
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Change https://golang.org/cl/70838 mentions this issue: [release-branch.go1.8] runtime: fix usleep by correctly setting nanoseconds parameter for pselect6

gopherbot pushed a commit that referenced this issue Oct 25, 2017
@pvoicu @rsc
[release-branch.go1.8] runtime: fix usleep by correctly setting nanos…

Verified

This commit was signed with the committer’s verified signature.
etu Elis Hirwing
GPG key ID: D57EFA625C9A925F
Verified
Learn about vigilant mode
1ab2a4e 
…econds parameter for pselect6

Fixes #21518

Change-Id: Idd67e3f0410d0ce991b34dcc0c8f15e0d5c529c9
Reviewed-on: https://go-review.googlesource.com/56850
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-on: https://go-review.googlesource.com/70838
Run-TryBot: Russ Cox <rsc@golang.org>
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@tsuna @pvoicu @aclements @ianlancetaylor @ALTree @gopherbot