The following .lockdown JSC tests are constantly failing on Debug BigSur: cdjs-tests.yaml/main.js.lockdown microbenchmarks/array-from-derived-object-func.js.lockdown microbenchmarks/array-from-object-func.js.lockdown microbenchmarks/bit-test-load.js.lockdown microbenchmarks/bit-test-nonconstant.js.lockdown microbenchmarks/data-view-accesses-2.js.lockdown microbenchmarks/delete-property-allocation-sinking.js.lockdown microbenchmarks/delete-property-inline-cache.js.lockdown microbenchmarks/delete-property-keeps-cacheable-structure.js.lockdown microbenchmarks/elidable-new-object-dag.js.lockdown microbenchmarks/elidable-new-object-then-call.js.lockdown microbenchmarks/elidable-new-object-tree.js.lockdown microbenchmarks/function-to-string.js.lockdown microbenchmarks/get-and-put-by-val-double-index-dont-fall-off-a-cliff.js.lockdown microbenchmarks/get-by-val-polymorphic-ic-1.js.lockdown microbenchmarks/get-by-val-polymorphic-ic-4.js.lockdown microbenchmarks/get-by-val-polymorphic-ic-5.js.lockdown microbenchmarks/get-private-name.js.lockdown microbenchmarks/hoist-get-by-offset-tower-with-inferred-types.js.lockdown microbenchmarks/int52-rand-function.js.lockdown microbenchmarks/memcpy-loop.js.lockdown microbenchmarks/object-is.js.lockdown microbenchmarks/obvious-sink-pathology-taken.js.lockdown microbenchmarks/oob-sane-chain-double.js.lockdown microbenchmarks/polyvariant-delete-property.js.lockdown microbenchmarks/richards-empty-try-catch.js.lockdown microbenchmarks/richards-try-catch.js.lockdown microbenchmarks/sinkable-new-object-dag.js.lockdown microbenchmarks/sinkable-new-object-taken.js.lockdown microbenchmarks/sinkable-new-object-with-builtin-constructor.js.lockdown microbenchmarks/sinkable-new-object.js.lockdown microbenchmarks/string-replace-string.js.lockdown microbenchmarks/to-number-boolean.js.lockdown microbenchmarks/typed-array-get-set-by-val-profiling.js.lockdown stress/allow-math-ic-b3-code-duplication.js.lockdown stress/call-var-args-phantom-arguments-handler-strict.js.lockdown stress/call-var-args-phantom-arguments-strict.js.lockdown stress/checkpoint-osr-exit-needs-to-reload-baseline-jit-constant-pool-gpr.js.lockdown stress/elide-new-object-dag-then-exit.js.lockdown stress/new-regex-inline.js.lockdown stress/obviously-elidable-new-object-then-exit.js.lockdown stress/private-name-assignment-in-constructor.js.lockdown stress/spread-forward-call-varargs-stack-overflow.js.lockdown stress/tail-call-var-args-phantom-arguments-handler-strict.js.lockdown stress/tail-call-var-args-phantom-arguments-strict.js.lockdown stress/undecided-arrays-should-not-need-original-array-for-length.js.lockdown stress/v8-deltablue-strict.js.lockdown stress/v8-richards-strict.js.lockdown v8-v6/v8-deltablue.js.lockdown v8-v6/v8-richards.js.lockdown Observed at this test run: https://build.webkit.org/#/builders/431/builds/2136