testfs
This is a DeepState test harness for TestFS, which is a user level toy file system that is similar to ext3.
TestFS comes out of U Toronto file system research:
J. Sun, D. Fryer, A. Goel,and A. D. Brown, “Using declarative invariants for protecting file-system integrity,” in Proceedings of the 6th Workshop on Programming Languages and Operating Systems. 2011. http://www.sigops.org/sosp/sosp11/workshops/plos/06-sun.pdf
This version is based on a series of implementations, first adapted to DeepState by Peter Goodman (https://github.com/pgoodman/testfs), now maintained by Alex Groce. The primary change is that a broken (undefined behavior causing) inode hash table has been disabled, with inode lookups always going to "disk." Disk here is a block-device emulated with a Big Old Array. Also, this adds a semi-POSIX layer on top of the low-level interface to TestFS.
Tests.cpp shows what a DeepState harness for a POSIX-like interface looks like.
Usage
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Install DeepState (https://github.com/trailofbits/deepstate), and build with BUILD_LIBFUZZER
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cmake .; make
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Use TestsLF to test via libFuzzer, and Tests to replay tests