thread 'fuzzer_1' panicked at 'couldn't read child hello

[qijiale]

When i run 'cargo run ../AFLplusplus/afl-qemu-trace -- ./main @@', it's fail.

Finished dev [unoptimized + debuginfo] target(s) in 0.04s
Running target/debug/fuzzer ../AFLplusplus/afl-qemu-trace -- ./main '@@'
[2022-11-22] 08:13:05 Starting Fuzzing...
thread 'fuzzer_1' panicked at 'couldn't read child hello: Error { kind: UnexpectedEof, message: "failed to fill whole buffer" }', forksrv/src/lib.rs:98:22.

What should I address it?

[1013503897]

verify if your binary file has been instrumented correctly with AFL++

[extf33]

verify if your binary file has been instrumented correctly with AFL++

Why it panics if binary file hasn't instrumented correctly by AFL++? I read the code, but I don't understand it well,