Fuzzer Error when fuzzing apache/apr

[Wakotu]

I encountered a fuzzer error when fuzzing apache/apr in official docker environment.

I build apache/apr with the following commands,where /fuzz/targets/apr is the prefix of install location.

./configure --prefix=/fuzz/targets/apr
make
make test
make install

Then I build and fuzz with the following commands:

OUTPUT_DIR=./output/apr_2
hopper compile --header targets/apr/include/apr-2/all.h --library targets/apr/lib/libapr-2.so --output "$OUTPUT_DIR"
hopper fuzz "$OUTPUT_DIR"

Note that targets/apr/include/apr-2/all.h is the header file that contains all the exported headers of apache/apr.
Hopper compiles and runs successfully.

Then I encountered the following fuzzer error soon.

in misc/fuzzer_error.log

Error {
    msg: "stop process status",
    source: Error {
        msg: "fail to read line: ",
        source: Os {
            code: 11,
            kind: WouldBlock,
            message: "Resource temporarily unavailable",
        },
    },
}

Backstrace:

  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
                                ⋮ 3 frames hidden ⋮
   4: hopper::execute::io_utils::read_line::h01d39995087e0878
      at <unknown source file>:<unknown line>
   5: hopper::execute::io_utils::receive_line::he0e0d72a627c9aa8
      at <unknown source file>:<unknown line>
   6: hopper::execute::forkcli::ForkCli::execute_program_fast::h90abd06c7ba34259
      at <unknown source file>:<unknown line>
   7: hopper::fuzzer::Fuzzer::run_program::hf7d4738307673528
      at <unknown source file>:<unknown line>
   8: hopper::fuzzer::Fuzzer::pilot_generate_func::h58636918dbcb3010
      at <unknown source file>:<unknown line>
   9: hopper::fuzz::infer::<impl hopper::fuzzer::Fuzzer>::pilot_infer::hc3de39070c76bfa5
      at <unknown source file>:<unknown line>
  10: hopper::fuzzer::Fuzzer::fuzz_loop::h50ce6719fba995c4
      at <unknown source file>:<unknown line>
  11: hopper::run_fuzzer::h537b24e41cd51b65
      at <unknown source file>:<unknown line>
  12: hopper_fuzzer::main::h43694cf3d82ea273
      at <unknown source file>:<unknown line>
  13: std::sys_common::backtrace::__rust_begin_short_backtrace::h51c167a89950432c
      at <unknown source file>:<unknown line>
  14: std::rt::lang_start::{{closure}}::h3e2fea973b7dd151
      at <unknown source file>:<unknown line>
  15: std::rt::lang_start_internal::hcee5ed89fc25829a
      at <unknown source file>:<unknown line>
  16: main<unknown>
      at <unknown source file>:<unknown line>
  17: __libc_start_main<unknown>
      at <unknown source file>:<unknown line>
  18: _start<unknown>
      at <unknown source file>:<unknown line>