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encoding/json: SyntaxError.Offset is wrong when decoding stream #44811

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santhosh-tekuri opened this issue Mar 5, 2021 · 5 comments
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encoding/json: SyntaxError.Offset is wrong when decoding stream #44811

santhosh-tekuri opened this issue Mar 5, 2021 · 5 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.

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@santhosh-tekuri
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What version of Go are you using (go version)?

$ go version
go version go1.15.6 darwin/amd64

Does this issue reproduce with the latest release?

yes. reproducable on playground with 1.16 version

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

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/santhosh/Library/Caches/go-build"
GOENV="/Users/santhosh/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/santhosh/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/santhosh/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/santhosh/json/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/z6/vfg99x7d2szf54dd2yms9j5r0000gn/T/go-build029684704=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

https://play.golang.org/p/cPDdjRRl1Rg

What did you expect to see?

offset: 34

What did you see instead?

offset: 24
@networkimprov
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cc @mvdan @dsnet

@mvdan mvdan added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Mar 5, 2021
@dsnet
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dsnet commented Mar 5, 2021

Yep. That looks like a bug.

AlexanderYastrebov added a commit to AlexanderYastrebov/go that referenced this issue Oct 13, 2021
@AlexanderYastrebov
encoding/json: calculate correct SyntaxError.Offset in the stream
3df3888 
Stream decoder does not count whitespaces, empty objects and arrays
in syntax error offset. This change removes offset tracking from the
scanner and relies on the calling code to provide the correct value.

Fixes golang#44811
@AlexanderYastrebov AlexanderYastrebov mentioned this issue Oct 13, 2021
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@gopherbot
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Change https://golang.org/cl/355729 mentions this issue: encoding/json: calculate correct SyntaxError.Offset in the stream

@AlexanderYastrebov
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I've found an apparent duplicate #34543 for which https://go-review.googlesource.com/c/go/+/284078/ attempts to add dec.scan.bytes++ in every possible place while my take abandons scanner offset tracking altogether.

AlexanderYastrebov added a commit to AlexanderYastrebov/go that referenced this issue Oct 13, 2021
@AlexanderYastrebov
encoding/json: calculate correct SyntaxError.Offset in the stream
47e6224 
Stream decoder does not count whitespaces, empty objects and arrays
in syntax error offset. This change removes offset tracking from the
scanner and relies on the calling code to provide the correct value.

Fixes golang#44811, golang#34543
@smlx smlx mentioned this issue Nov 1, 2021
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@seankhliao
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Duplicate of #34543

@seankhliao seankhliao marked this as a duplicate of #34543 Aug 20, 2022
@seankhliao seankhliao closed this as not planned Won't fix, can't repro, duplicate, stale Aug 20, 2022
@golang golang locked and limited conversation to collaborators Aug 20, 2023
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encoding/json: calculate correct SyntaxError.Offset in the stream AlexanderYastrebov/go
7 participants
@networkimprov @AlexanderYastrebov @santhosh-tekuri @mvdan @dsnet @gopherbot @seankhliao