WinAFL works better with older versions of windows?

[Daniel0xcc]

Hey My question is, if WinAFL works better with older versions of windows for example: Windows 7 x64 ?

thank you :).

[ifratric]

I've seen some issues lately with DynamoRIO on Windows 10 v1809, so if you're using that and experiencing issues it might make sense to try with an older version in a VM (an older version of Windows 10 should do, you don't have to go all the way back to Windows 7).

[Daniel0xcc]

Thank's ! :).

[baerli]

I experienced issues as well. I have a local Windows 10 v1809, Build 17763.557 (upgraded from Win7), working just fine with the current release of Dynamorio (DynamoRIO-Windows-7.1.0-1) and WinAFL out of the box, not even recompiled.
Trying to recreate that on a VM in the cloud, starting with v1809, DynamoRIO in all sorts of versions and recomiling WinAFL for that version. So far, I didn't get it to work. Right now I am on v1709, DynamoRIO-Windows-7.91.18058-0 and DynamoRIO-Windows-7.91.18068-0, WinAFL recompiled accordingly, getting strange DynamoRIO errors every 100-1000th run of the target ("Failed to take over all threads after multiple attempts").
I will spent some more time on it and let you know if I will find a good version/combination. Maybe I will setup a Win7 VM, but some things need to be fuzzed on Win10 :).
Cheers! :)