---
name: internal errors
---
# Internal errors

A **P** diagnostic is a panic: a check that should never fail in
correct operation did fail. These messages are not something your
Perl code can cause through ordinary mistakes - they signal a bug
in PetaPerl itself. If you see one, it is worth a bug report. See
[Disclaimer & bug reports](../../../disclaimer).

There is nothing to fix on the Perl side. Capture the message, the
input that triggered it, and the `pperl` version, and file it.

## `` `Unknown error` ``

**(P)** A fallback message for an error path that produced no
specific diagnostic - most often surfaced from a native module
(such as the GMP bignum backend) when an underlying library
returned a failure code with no text. Treat it as an internal
error and report it with the operation that triggered it.

## See also

- [Disclaimer & bug reports](../../../disclaimer) - how to file a
  pperl bug, and what to include.
- [pperl-specific diagnostics](pperl-specific) - other messages
  with no upstream Perl counterpart.