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If the database is opened through perl bindings (and even though nix.conf has use-sqlite-wal set to false), the database is automatically converted into WAL mode. This makes the next nix process to access the database convert it back to "truncate". If the database is still open at the time in wal mode by the perl program, this fails and crashes the nix doing the wal -> truncate conversion.
Nix is a purely functional package manager. For installation and usage instructions, please read the manual, which can be found in `docs/manual/manual.html', and additionally at the Nix website at <http://nixos.org/>. Acknowledgments This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (http://www.OpenSSL.org/).