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Panic in compress/gzip: index out of range #40008

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aka-rider opened this issue Jul 2, 2020 · 2 comments
Closed

Panic in compress/gzip: index out of range #40008

aka-rider opened this issue Jul 2, 2020 · 2 comments

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@aka-rider
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@aka-rider aka-rider commented Jul 2, 2020

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

go version go1.14.2 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output
$ go env

GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/rider/Library/Caches/go-build"
GOENV="/Users/rider/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY="gitlab.com/aigent/"
GONOSUMDB="gitlab.com/aigent/
"
GOOS="darwin"
GOPATH="/Users/rider/wrk/go"
GOPRIVATE="gitlab.com/aigent/*"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/Cellar/go/1.14.2_1/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.14.2_1/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/rider/wrk/go/src/gitlab.com/aigent/platform/processing/kaldi-client/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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/l8/_c7mlptn4zgbjb_xywymh2lm0000gn/T/go-build535733669=/tmp/go-build -gno-record-gcc-switches -fno-common"

Minimal code sample

The following snippet does not reproduce this panic, it should give an idea of what sequence of steps were used in the original application.

https://play.golang.org/p/6l6vN-hP006

panic: runtime error: index out of range [43] with length 30

goroutine 94 [running]:
compress/flate.(*huffmanBitWriter).indexTokens(0xc00000c3c0, 0xc0005b2000, 0xaf, 0x4001, 0xc0002ad5a0, 0x68624e)
	/usr/local/go/src/compress/flate/huffman_bit_writer.go:551 +0x2df
compress/flate.(*huffmanBitWriter).writeBlock(0xc00000c3c0, 0xc0005b2000, 0xaf, 0x4001, 0x0, 0xc0005ac522, 0x0, 0x5ade)
	/usr/local/go/src/compress/flate/huffman_bit_writer.go:440 +0xa1
compress/flate.(*compressor).writeBlock(0xc000700000, 0xc0005b2000, 0xae, 0x4001, 0xa522, 0x45, 0x0)
	/usr/local/go/src/compress/flate/deflate.go:170 +0xc5
compress/flate.(*compressor).deflate(0xc000700000)
	/usr/local/go/src/compress/flate/deflate.go:415 +0x8be
compress/flate.(*compressor).syncFlush(0xc000700000, 0x0, 0xc000081180)
	/usr/local/go/src/compress/flate/deflate.go:568 +0x50
compress/flate.(*Writer).Flush(...)
	/usr/local/go/src/compress/flate/deflate.go:727
compress/gzip.(*Writer).Flush(0xc0000e0a50, 0xac54c0, 0xc00035a500)
	/usr/local/go/src/compress/gzip/gzip.go:221 +0x5f
.........

goroutine 1890 [running]:
compress/flate.(*huffmanBitWriter).indexTokens(0xc00000c3c0, 0xc0005b2000, 0xaf, 0x4001, 0xc000aeb4f0, 0x68624e)
	/usr/local/go/src/compress/flate/huffman_bit_writer.go:551 +0x2df
compress/flate.(*huffmanBitWriter).writeBlock(0xc00000c3c0, 0xc0005b2000, 0xaf, 0x4001, 0x0, 0xc0005ac055, 0x4cd, 0x5fab)
	/usr/local/go/src/compress/flate/huffman_bit_writer.go:440 +0xa1
compress/flate.(*compressor).writeBlock(0xc000700000, 0xc0005b2000, 0xae, 0x4001, 0xa522, 0x58, 0x0)
	/usr/local/go/src/compress/flate/deflate.go:170 +0xc5
compress/flate.(*compressor).deflate(0xc000700000)
	/usr/local/go/src/compress/flate/deflate.go:415 +0x8be
compress/flate.(*compressor).write(0xc000700000, 0xc0000e6800, 0x305, 0x3ef, 0x3ef, 0xc0a35bef12, 0xc000aeb620)
	/usr/local/go/src/compress/flate/deflate.go:554 +0x83
compress/flate.(*Writer).Write(...)
	/usr/local/go/src/compress/flate/deflate.go:712
compress/gzip.(*Writer).Write(0xc0000e0a50, 0xc0000e6800, 0x305, 0x3ef, 0x0, 0x0, 0x88)
	/usr/local/go/src/compress/gzip/gzip.go:196 +0xc1
encoding/json.(*Encoder).Encode(0xc0000b1450, 0xac54c0, 0xc0001e6c80, 0xc00068d748, 0x40dc96)
	/usr/local/go/src/encoding/json/stream.go:231 +0x1ca
.........
@randall77
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@randall77 randall77 commented Jul 2, 2020

You have two goroutines using the same writer. That's a data race and is not allowed.
You should see a data race report when using the race detector (the -race option).

@aka-rider
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@aka-rider aka-rider commented Jul 2, 2020

Thanks for the clarification, I will look at it.

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