See https://github.com/dotnet/runtime/pull/83751/checks?check_run_id=14231197825 for example. Failures look like: > ld.lld(0,0): error : undefined symbol: EventPipeWriteEventGCAllocationTick_V3 @elinor-fung Is it possible this was caused by something cross-merging with https://github.com/dotnet/runtime/pull/87465?