[-] PROGRAM ABORT : Repeatedly failed to deliver sample

Hi Ivan,

Unfortunately am facing this issue where after 2 days of fuzzing am getting the following error with Jackalope exiting and
not saving the crash test case!

Exception at address 0000000076A39AFB
Exception in instrumented module xxx.dll
Code before:
99 2b c2 8b c8 d1 f9 8b c6 99
Code after:
f7 f9 8b b5 28 fd ff ff e9 38 00 00 00 8b 85 48
[!] WARNING: Error delivering sample, retrying with a clean target
[-] PROGRAM ABORT : Repeatedly failed to deliver sample         Location : Fuzzer::TryReproduceCrash(), C:\Users\symeon\Desktop\Jackalope\fuzzer.cpp:300

Interesting enough, I was able to reproduce this issue with different samples where before exiting it did save
the crash and I can confirm it was a valid crash!

What's the best way to help you reproduce it? Any ideas why is this happening?

Thanks!

Edit: Yes can confirm if I load the input_1 from the output folder (last fuzzed file) will indeed crash my harness.

Edit2: Am able to reproduce this issue within seconds, perhaps I could send you my repro privately..

Start at Fuzzer::TryReproduceCrash() in fuzzer.cpp around line 300 and reproduce the abort with the reported harness or the input_1 file from the output folder. Trace the repeated sample-delivery failure and determine how a valid crash can be preserved instead of causing the abort. Done means the failure is reproducible and the intended crash output behavior is verified.