Apple's fsx and fstorture programs. They are very good at finding issues with various system calls and in particular overlapping reads/writes.
Based from work of Bill Zissimopoulos, https://bitbucket.org/billziss/secfs.test
Prerequisites:
- Visual Studio (prepared in VS 2015)
- Windows 10 SDK
To run:
- Build the fsx.exe x64 with VS
- cd src\fsx
- .\fsx.exe -N 5000 C:\test