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i just pushed a few commits that should help with this. please make sure you've got the very latest version of go-fuzz and try again. if that doesn't work, please provide a public-code-only complete fuzz file that doesn't build. thanks.

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Hello,
Is this command to get the latest version of go-fuzz?
go install github.com/dvyukov/go-fuzz/go-fuzz@latest github.com/dvyukov/go-fuzz/go-fuzz-build@latest
Should I run this command inside the package which I wanna fuzz?

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go install github.com/dvyukov/go-fuzz/go-fuzz@latest github.com/dvyukov/go-fuzz/go-fuzz-build@latest

that should work

you should be able to run it anywhere 

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I still get the same problem. "misplaced compiler directive"

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if that doesn't work, please provide a public-code-only complete fuzz file that doesn't build.

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package integration

import (
"crypto/x509"
)

func Fuzz(data []byte) int {
// Call the function you want to fuzz, e.g., x509.ParseCertificateRequest
_, err := x509.ParseCertificateRequest(data)
if err != nil {
return 0 // Tell go-fuzz this input didn't trigger a panic
}
return 1 // This input is interesting
}
I can successfully run the go-fuzz github's example, but cannot run the above code

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sigh. i've fixed this bug so many times in so many ways. i'll look again next time i have the heart to. if you want to tackle it yourself, take a look at 7356175 and b1ce7bc -- the fix is very likely to be similar, and in the same area of code.

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The fix your provided to me is already there in the latest version of go-fuzz. However, I still have the same error:
/usr/local/go/src/crypto/internal/bigmod/nat_asm.go:21: misplaced compiler directive

Should I change the go-fuzz version to 1.14?

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I'm getting the same bug with the following latest versions

go.sum:
github.com/dvyukov/go-fuzz v0.0.0-20240203152606-b1ce7bc07150 h1:8ww/RtfHmtJSLk7nK/TspKZDdgDvvXwp0JMIIhJF35s=
github.com/dvyukov/go-fuzz v0.0.0-20240203152606-b1ce7bc07150/go.mod h1:11Gm+ccJnvAhCNLlf5+cS9KjtbaD5I5zaZpFMsTHWTw=

go install github.com/dvyukov/go-fuzz/go-fuzz@latest github.com/dvyukov/go-fuzz/go-fuzz-build@latest

$ ~/go/bin/go-fuzz-build
failed to execute go build: exit status 1

crypto/internal/bigmod

/usr/local/go/src/crypto/internal/bigmod/nat_asm.go:21: misplaced compiler directive

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There is an workaround. You can avoid transpiling module in question.

$ ~/go/bin/go-fuzz-build -preserve crypto/internal/bigmod

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