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syscall: checkptr failures relating to Dirent on darwin and freebsd #35092

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mdempsky opened this issue Oct 23, 2019 · 11 comments
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syscall: checkptr failures relating to Dirent on darwin and freebsd #35092

mdempsky opened this issue Oct 23, 2019 · 11 comments

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@mdempsky
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@mdempsky mdempsky commented Oct 23, 2019

The freebsd and darwin -race builders are currently failing:

Both of these appear to be failing due to use of syscall.Dirent.

@cuonglm
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@cuonglm cuonglm commented Oct 23, 2019

It does not happen for me under 10.15:

$ env -u GO111MODULE go tool dist test -race go_test:syscall
##### Testing packages.
ok  	syscall	3.549s

ALL TESTS PASSED (some were excluded)
@bradfitz bradfitz added this to the Go1.14 milestone Oct 23, 2019
@cuonglm
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@cuonglm cuonglm commented Oct 23, 2019

It seems that:

$ cd syscall
$ go test -race

trigger the error.

@cuonglm
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@cuonglm cuonglm commented Oct 23, 2019

So it's not -race, but in #34972, we check with -short, so not all tests were run. With:

go test -a -gcflags=all=-d=checkptr syscall

The test is always false.

@tklauser
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@tklauser tklauser commented Oct 23, 2019

Same happens in golang.org/x/sys/unix on the freebsd-amd64-race builder with -d=checkptr enabled:

https://build.golang.org/log/79e02a85654067a443293a96844a33710e123c27

@mdempsky
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@mdempsky mdempsky commented Oct 23, 2019

I'm probably not going to have time to look into this for another week or so. If someone wants to fix this, please go for it. Otherwise, it's probably worth at least adding some //go:nocheckptr directives with TODOs referencing this issue to at least get the build passing again.

@cuonglm
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@cuonglm cuonglm commented Oct 24, 2019

@mdempsky I'm investigating darwin one. Still not clearly understand the issue. If I add runtime.KeepAlive(buf) after this line:

var buf [2048]byte

Then the test pass. But it does fails again with -d=checkptr=2.

@gopherbot
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@gopherbot gopherbot commented Oct 24, 2019

Change https://golang.org/cl/203077 mentions this issue: syscall: make TestGetdirentries checkptr safe

gopherbot pushed a commit that referenced this issue Oct 24, 2019
Fixes Darwin.

Updates #35092

Change-Id: I045f070c8549d00610b459e3a82cac870d9ddb54
Reviewed-on: https://go-review.googlesource.com/c/go/+/203077
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
@gopherbot
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@gopherbot gopherbot commented Oct 24, 2019

Change https://golang.org/cl/202878 mentions this issue: syscall: make convertFromDirents11 checkptr safe

@gopherbot gopherbot closed this in 722b0e3 Oct 24, 2019
@gopherbot
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@gopherbot gopherbot commented Oct 24, 2019

Change https://golang.org/cl/202959 mentions this issue: unix: make convertFromDirents11 checkptr safe

@gopherbot
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@gopherbot gopherbot commented Oct 24, 2019

Change https://golang.org/cl/202880 mentions this issue: syscall: correct comment in testGetdirentries

gopherbot pushed a commit that referenced this issue Oct 24, 2019
Correct comment about allocating big enough slice to copy result of
Getdirentries.

While at it, also convert from Dirent directly to slice of byte.

Updates #35092

Change-Id: I892de7953120622882e1561728e1e56b009a2351
Reviewed-on: https://go-review.googlesource.com/c/go/+/202880
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
@gopherbot
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@gopherbot gopherbot commented Oct 24, 2019

Change https://golang.org/cl/203238 mentions this issue: unix: make convertFromDirents11 checkptr safe

gopherbot pushed a commit to golang/sys that referenced this issue Oct 25, 2019
Follow CL 202878 which did the same for package syscall.

Updates golang/go#35092

Change-Id: Id53d2cde0333581c98d13b096a48f2a602b2425f
Reviewed-on: https://go-review.googlesource.com/c/sys/+/202959
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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