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zikaeroh opened this issue Oct 29, 2020 · 9 comments
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cmd/compile: internal compiler error: devirtualization failed (x/text, x/build, protobuf) #42279

zikaeroh opened this issue Oct 29, 2020 · 9 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done. release-blocker
Milestone
Go1.16

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@zikaeroh
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zikaeroh commented Oct 29, 2020 •
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What version of Go are you using (go version)?

$ go version
go version devel +5cc43c51c9 Thu Oct 29 19:06:32 2020 +0000 linux/amd64

Does this issue reproduce with the latest release?

On tip, yes.

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

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/jake/.cache/go-build"
GOENV="/home/jake/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/jake/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/jake/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/jake/sdk/gotip"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/jake/sdk/gotip/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/jake/zikaeroh/hortbot/hortbot2/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build236306354=/tmp/go-build -gno-record-gcc-switches"
GOROOT/bin/go version: go version devel +5cc43c51c9 Thu Oct 29 19:06:32 2020 +0000 linux/amd64
GOROOT/bin/go tool compile -V: compile version devel +5cc43c51c9 Thu Oct 29 19:06:32 2020 +0000
uname -sr: Linux 5.9.1-zen2-1-zen
/usr/lib/libc.so.6: GNU C Library (GNU libc) release release version 2.32.
gdb --version: GNU gdb (GDB) 9.2

What did you do?

Ran gotip test in my project to check for performance changes from the new inlining/devirtualization changes.

I don't think I need to provide the exact code; the error message shows which files in my module cache are failing to be built.

I'm guessing a build dashboard will reveal this, I'm just probably too quick to test changes I'm excited to see...

What did you expect to see?

A build success.

What did you see instead?

An ICE:

# golang.org/x/text/encoding
../../../go/pkg/mod/golang.org/x/text@v0.3.3/encoding/encoding.go:293:5: internal compiler error: devirtualization failed: transform.t.(*Decoder).Transformer.Reset

goroutine 1 [running]:
runtime/debug.Stack(0xdaf700, 0xc00012a008, 0x0)
	/home/jake/sdk/gotip/src/runtime/debug/stack.go:24 +0x9f
cmd/compile/internal/gc.Fatalf(0xca427c, 0x1b, 0xc0004c95c0, 0x1, 0x1)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/subr.go:199 +0x1b0
cmd/compile/internal/gc.devirtualizeCall(0xc0004b8080)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/inl.go:1454 +0x2ab
cmd/compile/internal/gc.devirtualize.func1(0xc0004b8080, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/inl.go:1428 +0x45
cmd/compile/internal/gc.inspect(0xc0004b8080, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1072 +0x43
cmd/compile/internal/gc.inspectList(0xc0004b2480, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.inspect(0xc0004b8880, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1075 +0x66
cmd/compile/internal/gc.inspect(0xc00048d680, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1076 +0x85
cmd/compile/internal/gc.inspectList(0xc00011d8c0, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.inspect(0xc00046fb00, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1078 +0xc5
cmd/compile/internal/gc.inspectList(0xc00011d8d8, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.devirtualize(0xc000192580)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/inl.go:1426 +0x4b
cmd/compile/internal/gc.Main(0xcbbce0)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/main.go:706 +0x324b
main.main()
	/home/jake/sdk/gotip/src/cmd/compile/main.go:52 +0xb1

# github.com/golang/protobuf/proto
../../../go/pkg/mod/github.com/golang/protobuf@v1.4.3/proto/deprecated.go:18:2: internal compiler error: devirtualization failed: xtd.(*impl.extensionTypeDescriptor).ExtensionDescriptor.HasDefault

goroutine 1 [running]:
runtime/debug.Stack(0xdaf700, 0xc00000e018, 0x0)
	/home/jake/sdk/gotip/src/runtime/debug/stack.go:24 +0x9f
cmd/compile/internal/gc.Fatalf(0xca427c, 0x1b, 0xc0007235e0, 0x1, 0x1)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/subr.go:199 +0x1b0
cmd/compile/internal/gc.devirtualizeCall(0xc000429e80)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/inl.go:1454 +0x2ab
cmd/compile/internal/gc.devirtualize.func1(0xc000429e80, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/inl.go:1428 +0x45
cmd/compile/internal/gc.inspect(0xc000429e80, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1072 +0x43
cmd/compile/internal/gc.inspectList(0xc00000d8f0, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.inspect(0xc000429d80, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1078 +0xc5
cmd/compile/internal/gc.inspectList(0xc00000d950, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.inspect(0xc000429a00, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1078 +0xc5
cmd/compile/internal/gc.inspectList(0xc00000da58, 0xcbbe50)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.devirtualize(0xc0001542c0)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/inl.go:1426 +0x4b
cmd/compile/internal/gc.Main(0xcbbce0)
	/home/jake/sdk/gotip/src/cmd/compile/internal/gc/main.go:706 +0x324b
main.main()
	/home/jake/sdk/gotip/src/cmd/compile/main.go:52 +0xb1

FAIL	github.com/hortbot/hortbot/internal/bot [build failed]
FAIL

cc @mdempsky
@zikaeroh zikaeroh changed the title cmd/compile: internal compiler error: devirtualization failed cmd/compile: internal compiler error: devirtualization failed (x/text, protobuf) Oct 29, 2020
@mdempsky mdempsky self-assigned this Oct 29, 2020
@mdempsky mdempsky added NeedsFix The path to resolution is known, but the work has not been done. release-blocker labels Oct 29, 2020
@mdempsky mdempsky added this to the Go1.16 milestone Oct 29, 2020
@mdempsky
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Thanks, on it.

@gopherbot
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Change https://golang.org/cl/266359 mentions this issue: cmd/compile: gracefully fail when devirtualization fails

@zikaeroh
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Confusingly, golang.org/x/text@v0.3.3/encoding/encoding.go at line 293 isn't even what the error reports, its an errors.New call with a string.

var ErrInvalidUTF8 = errors.New("encoding: invalid UTF-8")

@kevinburke1
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In case more test cases helps

$ go build ./...
# github.com/meterup/auth/vendor/github.com/golang/protobuf/proto
vendor/github.com/golang/protobuf/proto/deprecated.go:18:2: internal compiler error: devirtualization failed: xtd.(*impl.extensionTypeDescriptor).ExtensionDescriptor.HasDefault

goroutine 1 [running]:
runtime/debug.Stack(0x19adbe0, 0xc0000b8008, 0x0)
	/Users/kevin/go/src/runtime/debug/stack.go:24 +0x9f
cmd/compile/internal/gc.Fatalf(0x18a1cc4, 0x1b, 0xc0008df5e0, 0x1, 0x1)
	/Users/kevin/go/src/cmd/compile/internal/gc/subr.go:199 +0x1b0
cmd/compile/internal/gc.devirtualizeCall(0xc000142200)
	/Users/kevin/go/src/cmd/compile/internal/gc/inl.go:1454 +0x2ab
cmd/compile/internal/gc.devirtualize.func1(0xc000142200, 0x18b9748)
	/Users/kevin/go/src/cmd/compile/internal/gc/inl.go:1428 +0x45
cmd/compile/internal/gc.inspect(0xc000142200, 0x18b9748)
	/Users/kevin/go/src/cmd/compile/internal/gc/syntax.go:1072 +0x43
cmd/compile/internal/gc.inspectList(0xc00041a108, 0x18b9748)
	/Users/kevin/go/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.inspect(0xc000142100, 0x18b9748)
	/Users/kevin/go/src/cmd/compile/internal/gc/syntax.go:1078 +0xc5
cmd/compile/internal/gc.inspectList(0xc00041a168, 0x18b9748)
	/Users/kevin/go/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.inspect(0xc00013fd80, 0x18b9748)
	/Users/kevin/go/src/cmd/compile/internal/gc/syntax.go:1078 +0xc5
cmd/compile/internal/gc.inspectList(0xc00041a270, 0x18b9748)
	/Users/kevin/go/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.devirtualize(0xc000419340)
	/Users/kevin/go/src/cmd/compile/internal/gc/inl.go:1426 +0x4b
cmd/compile/internal/gc.Main(0x18b95d8)
	/Users/kevin/go/src/cmd/compile/internal/gc/main.go:706 +0x324b
main.main()
	/Users/kevin/go/src/cmd/compile/main.go:52 +0xb1

that's github.com/golang/protobuf v1.4.2

@mdempsky
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Confusingly, golang.org/x/text@v0.3.3/encoding/encoding.go at line 293 isn't even what the error reports, its an errors.New call with a string.

Yeah, I noticed that too. I think that's an artifact of Fatalf using lineno, but devirtualizeCall being new and written in a style that avoids setting lineno. So Fatalf is misreporting against the last time we set lineno (which was probably the last function to be analyzed for inlining).

@mdempsky
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Looks like both of the reported failure cases are because of a struct type having a promoted method from an embedded interface-typed field. So we can't fully devirtualize those calls, but we can still improve them somewhat.

gopherbot pushed a commit that referenced this issue Oct 29, 2020
@mdempsky
cmd/compile: gracefully fail when devirtualization fails
aa4f48b 
We should still be able to devirtualize here, but I need to understand
the AST better. While I'm doing that, at least switch to a graceful
failure case (i.e., skip the optimization and print a warning message)
to fix the x/text builders.

Updates #42279.

Change-Id: Ie2b0b701fccf590d0cabfead703fc2fa999072cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/266359
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
@gopherbot
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Change https://golang.org/cl/266300 mentions this issue: cmd/compile: fix devirtualization of promoted interface methods

@zikaeroh zikaeroh mentioned this issue Oct 29, 2020
Closed
@dmitshur dmitshur changed the title cmd/compile: internal compiler error: devirtualization failed (x/text, protobuf) cmd/compile: internal compiler error: devirtualization failed (x/text, x/build, protobuf) Oct 30, 2020
@dmitshur
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Two more data points from x/build:


# golang.org/x/build/cmd/coordinator [golang.org/x/build/cmd/coordinator.test]
cmd/coordinator/builders.go:43:5: internal compiler error: devirtualization failed: tlsLn.(*tls.listener).Listener.Addr

goroutine 1 [running]:
runtime/debug.Stack(0x19adbc0, 0xc0000ba008, 0x0)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/runtime/debug/stack.go:24 +0x9f
cmd/compile/internal/gc.Fatalf(0x18a1cc4, 0x1b, 0xc0008f3618, 0x1, 0x1)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/subr.go:199 +0x1b0
cmd/compile/internal/gc.devirtualizeCall(0xc000077d80)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/inl.go:1454 +0x2ab
cmd/compile/internal/gc.devirtualize.func1(0xc000077d80, 0x0)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/inl.go:1428 +0x45
cmd/compile/internal/gc.inspect(0xc000077d80, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1072 +0x43
cmd/compile/internal/gc.inspect(0xc0014b9800, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1076 +0x85
cmd/compile/internal/gc.inspectList(0xc0000afda0, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.inspect(0xc000077c00, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1078 +0xc5
cmd/compile/internal/gc.inspectList(0xc0000afe30, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.devirtualize(0xc0001242c0)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/inl.go:1426 +0x4b
cmd/compile/internal/gc.Main(0x18b95d0)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/main.go:706 +0x324b
main.main()
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/main.go:52 +0xb1

# golang.org/x/build/devapp [golang.org/x/build/devapp.test]
devapp/data.go:12:2: internal compiler error: devirtualization failed: tlsLn.(*tls.listener).Listener.Addr

goroutine 1 [running]:
runtime/debug.Stack(0x19adbc0, 0xc0000c0008, 0x0)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/runtime/debug/stack.go:24 +0x9f
cmd/compile/internal/gc.Fatalf(0x18a1cc4, 0x1b, 0xc000a29618, 0x1, 0x1)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/subr.go:199 +0x1b0
cmd/compile/internal/gc.devirtualizeCall(0xc000399180)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/inl.go:1454 +0x2ab
cmd/compile/internal/gc.devirtualize.func1(0xc000399180, 0x0)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/inl.go:1428 +0x45
cmd/compile/internal/gc.inspect(0xc000399180, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1072 +0x43
cmd/compile/internal/gc.inspect(0xc000efcf00, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1076 +0x85
cmd/compile/internal/gc.inspectList(0xc00000ced0, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.inspect(0xc000399000, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1078 +0xc5
cmd/compile/internal/gc.inspectList(0xc00000cf18, 0x18b9740)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/syntax.go:1085 +0x58
cmd/compile/internal/gc.devirtualize(0xc00042d4a0)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/inl.go:1426 +0x4b
cmd/compile/internal/gc.Main(0x18b95d0)
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/internal/gc/main.go:706 +0x324b
main.main()
	/private/var/folders/kh/5zzynz152r94t18yzstnrwx80000gn/T/workdir-host-darwin-10_15/go/src/cmd/compile/main.go:52 +0xb1

From https://build.golang.org/?repo=golang.org%2fx%2fbuild for Go commit 5cc43c5. (Other Go commits look okay.)

@mdempsky
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@dmitshur Thanks. Those are both instances of promoted interface methods too, and should be handled correctly by e62adb1.

@golang golang locked and limited conversation to collaborators Oct 30, 2021
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