Hello, We are researchers from Columbia University, New York. As part of our current research we have found some semantic discrepancies between ext4 and the POSIX specification/other popular filesystems. We have attached two cases. The first one involves a direct access read starting from file EOF. Ext4 behavior in this case seems to violate the POSIX standard. In directory 2, we discovered that ext4 and other popular filesystems (xfs/btrfs/f2fs) return different error codes for the same lseek syscall. In each directory, you will find a Readme describing the issue and pointing to the code that may cause the problem. For your convenience, we also included test programs (min.cpp) and instructions in Readme to help reproduce the issues. We would appreciate very much if you could confirm the two cases at your conveniences. Thanks, Amy
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ext4_issues.tar.gz
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