Out of latest 100 failures in mach5 xxx-comp-baseline, 5 failures are with the ./lib/classlist file:

~/tmp/tasks_log$ grep '[.]/lib/classlist' *
xxxxxxx-xxxx-20220303-0651-29640694-macosx-x64-cmp-baseline-macosx-x64-build-18:[2022-03-03T07:29:40,104Z] ./lib/classlist
iklam-zoo-20220315-1706-30065110-macosx-aarch64-cmp-baseline-macosx-aarch64-build-71:[2022-03-15T17:33:06,108Z] ./lib/classlist
mach5-one-jdk-11-0-16+1-80-tier5-20220304-0823-29681724-windows-x64-cmp-baseline-windows-x64-build-18:[2022-03-04T08:43:43,781Z] ./lib/classlist
mach5-one-jdk-17-0-4+1-69-tier5-20220208-2240-28940781-windows-x64-cmp-baseline-windows-x64-build-17:[2022-02-08T23:25:11,227Z] ./lib/classlist
xxxxxxx-xxxxxx-xxxx-20220304-1848-29701404-windows-x64-cmp-baseline-windows-x64-build-890:[2022-03-04T20:31:46,533Z] ./lib/classlist

Occurrence is low. About 5 times in more than 1 month of testing.