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cmd/compile: ICE on deferred call to syscall.LazyDLL.Call [1.16 backport] #44464

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gopherbot opened this issue Feb 20, 2021 · 7 comments
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cmd/compile: ICE on deferred call to syscall.LazyDLL.Call [1.16 backport] #44464

gopherbot opened this issue Feb 20, 2021 · 7 comments
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CherryPickApproved
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Go1.16.1

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@gopherbot
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@gopherbot gopherbot commented Feb 20, 2021 •
edited by dmitshur

@ianlancetaylor requested issue #44415 (fixed by 23943a6 for Go 1.17) to be considered for backport to the next 1.16 minor release.

@gopherbot Please backport to Go 1.16.

Compiler crash on valid Windows code that compiled with Go 1.15.
@gopherbot gopherbot added the CherryPickCandidate label Feb 20, 2021
@gopherbot gopherbot mentioned this issue Feb 20, 2021
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@gopherbot gopherbot added this to the Go1.16.1 milestone Feb 20, 2021
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@gopherbot gopherbot commented Feb 25, 2021

Change https://golang.org/cl/296489 mentions this issue: [release-branch.go1.16] cmd/compile: fix mishandling of unsafe-uintptr arguments with call method in go/defer
@cagedmantis
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@cagedmantis cagedmantis commented Feb 25, 2021

Approved. This is a serious issue.
@cagedmantis cagedmantis added the CherryPickApproved label Feb 25, 2021
@gopherbot gopherbot removed the CherryPickCandidate label Feb 25, 2021
@mdempsky
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@mdempsky mdempsky commented Feb 25, 2021

What's the time frame like for 1.16.1? I'm wondering how much time we have for finding a revised fix for #44415 and preparing a backport CL.
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@cagedmantis cagedmantis commented Feb 25, 2021

The point releases are tentatively scheduled for the middle of the first week in March 2021.
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@mdempsky mdempsky commented Feb 25, 2021

Okay, great, we should definitely have a fix for this by then.
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@gopherbot gopherbot commented Feb 26, 2021

Change https://golang.org/cl/296769 mentions this issue: [release-branch.go1.16] cmd/compile: fix mishandling of unsafe-uintptr arguments with call method in go/defer
gopherbot pushed a commit that referenced this issue Mar 1, 2021
@cuonglm @dmitshur
[release-branch.go1.16] cmd/compile: fix mishandling of unsafe-uintpt…
ca9cd62 
…r arguments with call method in go/defer

In CL 253457, we did the same fix for direct function calls. But for
method calls, the receiver argument also need to be passed through the
wrapper function, which we are not doing so the compiler crashes with
the code in #44415.

It will be nicer if we can rewrite OCALLMETHOD to normal OCALLFUNC, but
that will be for future CL. The passing receiver argument to wrapper
function is easier for backporting to go1.16 branch.

Fixes #44464

Change-Id: I03607a64429042c6066ce673931db9769deb3124
Reviewed-on: https://go-review.googlesource.com/c/go/+/296490
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-on: https://go-review.googlesource.com/c/go/+/296769
Trust: Bryan C. Mills <bcmills@google.com>
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@gopherbot gopherbot commented Mar 1, 2021

Closed by merging ca9cd62 to release-branch.go1.16.
@gopherbot gopherbot closed this Mar 1, 2021
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