diff --git a/testing/btest/Baseline.zam/scripts.base.frameworks.logging.rotate-custom-fmt-func-bad/.stderr b/testing/btest/Baseline.zam/scripts.base.frameworks.logging.rotate-custom-fmt-func-bad/.stderr
new file mode 100644
index 0000000000..501f90423c
--- /dev/null
+++ b/testing/btest/Baseline.zam/scripts.base.frameworks.logging.rotate-custom-fmt-func-bad/.stderr
@@ -0,0 +1,5 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+1299481205.000000 warning: non-void function returning without a value: Test::my_rotation_format_func
+1299481205.000000 error: Failed to call Log::rotation_format_func for path test continuing with rotation to: ./test-11-03-07_06.00.05
+1299495605.000000 runtime error in <...>/rotate-custom-fmt-func-bad.zeek, line 34: division by zero
+1299495605.000000 error: Failed to call Log::rotation_format_func for path test continuing with rotation to: ./test-11-03-07_10.00.05
diff --git a/testing/btest/Baseline.zam/scripts.base.frameworks.logging.rotate-custom-fmt-func-bad/out b/testing/btest/Baseline.zam/scripts.base.frameworks.logging.rotate-custom-fmt-func-bad/out
new file mode 100644
index 0000000000..b8c9d46382
--- /dev/null
+++ b/testing/btest/Baseline.zam/scripts.base.frameworks.logging.rotate-custom-fmt-func-bad/out
@@ -0,0 +1,11 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+test-1.log
+test-10.log
+test-11-03-07_06.00.05.log
+test-11-03-07_10.00.05.log
+test-2.log
+test-3.log
+test-5.log
+test-6.log
+test-7.log
+test-9.log