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commitd3042cbe84upstream. The error path of copying the old config used the wrong variable in the error message: $ mkdir /tmp/build $ ./tools/testing/ktest/config-bisect.pl -b /tmp/build config-good /tmp/config-bad $ chmod 0 /tmp/build $ ./tools/testing/ktest/config-bisect.pl -b /tmp/build config-good /tmp/config-bad good cp /tmp/build//.config config-good.tmp ... [0 seconds] FAILED! Use of uninitialized value $config in concatenation (.) or string at ./tools/testing/ktest/config-bisect.pl line 744. failed to copy to config-good.tmp When it should have shown: failed to copy /tmp/build//.config to config-good.tmp Cc: stable@vger.kernel.org Cc: John 'Warthog9' Hawley <warthog9@kernel.org> Fixes:0f0db06599("ktest: Add standalone config-bisect.pl program") Link: https://patch.msgid.link/20251203180924.6862bd26@gandalf.local.home Reported-by: "John W. Krahn" <jwkrahn@shaw.ca> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>