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cmd/trace: "failed to parse trace: no consistent ordering of events possible" #29707

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256dpi opened this Issue Jan 12, 2019 · 3 comments

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256dpi commented Jan 12, 2019

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

$ go version
go version go1.11.4 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
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/256dpi/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/256dpi/Development/Go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.11.4/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.11.4/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
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/mj/lp3r462x6tqfd4v_93bvh65h0000gn/T/go-build000614795=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I ran a network intensive go program (closed source) with a fairly light workload.

What did you expect to see?

I expect to be able to obtain a trace profile and explore it with the viewer program.

What did you see instead?

After obtaining the profile with wget -O trace.out "http://localhost:6060/debug/pprof/trace?seconds=10". When running go tool trace trace.out I received:

2019/01/12 12:37:26 Parsing trace...
failed to parse trace: no consistent ordering of events possible
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256dpi commented Jan 15, 2019

I have to add, I was testing a binary that was linked with C code (CGO). Is it possible that tracing does not work properly in CGO builds?

@bcmills bcmills changed the title failed to parse trace: no consistent ordering of events possible net/http/pprof: "failed to parse trace: no consistent ordering of events possible" Jan 30, 2019

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bcmills commented Jan 30, 2019

CC @rsc @hyangah @matloob @dvyukov for pprof and trace

@bcmills bcmills added this to the Go1.13 milestone Jan 30, 2019

@bcmills bcmills changed the title net/http/pprof: "failed to parse trace: no consistent ordering of events possible" cmd/trace: "failed to parse trace: no consistent ordering of events possible" Jan 30, 2019

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hyangah commented Jan 30, 2019

#16755 was the first one that came to my mind, but I've never seen the issue with darwin/amd64, so I am not sure. I am not aware of cmd/trace issues involving cgo.

@256dpi is it possible to share the captured trace with me?

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