• TSAN fails an assertion if more than 64 locks are active on a single thread
  • https://github.com/llvm-mirror/compiler-rt/blob/master/lib/sanitizer_common/sanitizer_deadlock_detector.h#L67

  •     CHECK_LT(n_all_locks_, ARRAY_SIZE(all_locks_with_contexts_));
    

• SBE plan cache creates one partition (and one mutex) for each core in the system:

  •         globalPlanCache =
                std::make_unique<sbe::PlanCache>(cappedCacheSize, ProcessInfo::getNumLogicalCores());
    

The rhel80-xxlarge distro uses a c6a.24xlarge machine with 96 cores. This results in attempting to lock 96 partitions when clearing the cache and exceeds the 64 lock limit in TSAN.