A directory tree was copied into a subdirectory of Lustre. At least one of the subdirectories in the newly created tree in Lustre does not appear in its parent's directory listing. The directory does exist, and it is possible to cd into that unlisted directory.

The same behavior is exhibited from multiple clients, so it is not a problem of just one client's cache being corrupt.

We are seeing this with the LLNL branch of Lustre 2.4.2 (github.com/chaos/lustre).

We could not identify any console messages associated with the problem.

The problem was seen on the secure network, so we cannot directly provide any logs.

This problem has suspiciously similar symptoms in common with LU-5254.