fs-fuzz
two simple fuzzers, one for UNIX filesystem operations, the other for C streams
MIT License
This projects contains two little fuzzers:
fd_fuzz is a single-threaded stress test for the UNIX file I/O layer
file_fuzz is a single-threaded stress test for the C streams layer
Both are intended to operate differentially: run them with the same seed on two different implementations and diff their output.
Both tools contain a number of caveats and limitations and compile-time configuration options embedded in their source code. You'll want to read the code before using these. They are quick and dirty.
Both tools are designed to be a bit conservative, avoiding areas of the respective standards that are highly underspecified. For example file_fuzz avoids opening two FILEs that refer to the same on-disk file because on some platforms (OS X in particular) there does not seem to be any way to sync up the cached file information with the on-dis information, rendering meaningful testing impossible.
N.B. if you want to compare two different runs, the initial contents of the files data-0, data-1, etc. must be the same on both machines. These files need not exist.