If you think you have found a bug in GNU cmp,
diff, diff3, or sdiff, please report it
by electronic mail to the
GNU utilities
bug report mailing list bug-diffutils@gnu.org. Please send
bug reports for GNU patch to
bug-patch@gnu.org. Send as precise a description of the
problem as you can, including the output of the --version
option and sample input files that produce the bug, if applicable. If
you have a nontrivial fix for the bug, please send it as well. If you
have a patch, please send it too. It may simplify the maintainer’s
job if the patch is relative to a recent test release, which you can
find in the directory ftp://alpha.gnu.org/gnu/diffutils/.