Fork server handshake failed issue on Jil.dll about sharpfuzz HOT 4 CLOSED

I'm having a similar issue (I'm using afl-fuzz 2.52b, the google one), but it stopped working from me when I moved from WSL1 to WSL2 (Ubuntu 20.04).

I did ulimit -Sv $[999 << 10]; dotnet bin/fuzzed_app.dll and this appears:

Failed to create CoreCLR, HRESULT: 0x8007000E

From dotnet/runtime#13027 It looks that It may be a problem with the ram, but if I write ulimit -v I get unlimited

I will keep investigating but this may help you @nvivekk

Any idea @Metalnem ?

Thanks!

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@nvivekk, did you instrument Jil.dll by running sharpfuzz Jil.dll command on it? Also, can you share your main program (even better would be if you could attach the whole project)?

@Jossec101, I have no idea what could be causing your issue. If it was working on WSL1, and now it's not on WSL2, I doubt the issue is in SharpFuzz.

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And issue got resolved I was instrumenting Jil.dll and replacing it on test folder. But i ran build without instrumented DLL earlier. Now its working fine.

@Jossec101 I am trying it on linux distro. So WSL2 may not be an issue here.

Thanks for the reponse. @Metalnem

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I'm using dotnet 6.0 on ubuntu 20.04 with 2GB RAM and got Fork server handshake failed

Here is my step to run afl-fuzz @Metalnem

git clone https://github.com/Metalnem/sharpfuzz-samples.git
cd sharpfuzz-samples/Newtonsoft.Json/Newtonsoft.Json.Fuzz
wget https://www.nuget.org/api/v2/package/Newtonsoft.Json/13.0.2-beta1
mv 13.0.2-beta1 13.0.2-beta1.zip; unzip 13.0.2-beta1.zip -d Newtonsoft13beta
# cp 13.0.2-beta1/lib/net6.0/* .
sharpfuzz Newtonsoft13beta/lib/netstandard2.0/Newtonsoft.Json.dll
dotnet add package SharpFuzz
# prepare corpus
mkdir input; mkdir tmpinput; mkdir output
echo '{"a": "b"}' > input/a.json
wget https://raw.githubusercontent.com/AFLplusplus/AFLplusplus/stable/dictionaries/json.dict
dotnet build
afl-fuzz -i input/ -o output -m none -t 5000 -x json.dict dotnet bin/Debug/netcoreapp2.2/Newtonsoft.Json.Fuzz.dll

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