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debug/macho: over allocation in NewFile #58755

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catenacyber opened this issue Feb 27, 2023 · 2 comments
Closed

debug/macho: over allocation in NewFile #58755

catenacyber opened this issue Feb 27, 2023 · 2 comments
Labels
FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.21

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

$ go version
go version go1.19 linux/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=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/root/.go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/root/.go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.19"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/src/ngolo-fuzzing/go.mod"
GOWORK=""
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 -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2481516251=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Run https://go.dev/play/p/hCK_Qo2vN9S?v=gotip

What did you expect to see?

The program finishing and printing Hello, without allocating too much

What did you see instead?

Running go tool pprof --sample_index=alloc_space toto.heap and then top I see

      flat  flat%   sum%        cum   cum%
    3304.16MB 99.87% 99.87%  3304.16MB 99.87%  debug/macho.NewFile

Found by https://github.com/catenacyber/ngolo-fuzzing with oss-fuzz :
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=56385
@dmitshur
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CC @golang/compiler, @ianlancetaylor.

@dmitshur dmitshur added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Feb 27, 2023
@dmitshur dmitshur added this to the Backlog milestone Feb 27, 2023
@gopherbot
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Change https://go.dev/cl/471835 mentions this issue: debug/macho: use saferio to read dynamic indirect symbols

@dmitshur dmitshur modified the milestones: Backlog, Go1.21 Feb 28, 2023
@dmitshur dmitshur added NeedsFix The path to resolution is known, but the work has not been done. and removed NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Feb 28, 2023
@golang golang locked and limited conversation to collaborators Feb 28, 2024
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Milestone
Go1.21
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@dmitshur @gopherbot @catenacyber