The most suspicious parts should probably be tested by asserting
at various sites that the *PCL-LOCK* is held.
+accesses locked with a nice granularity
+ SB-PCL::*FIND-CLASS*
+
read-only & safe:
SB-PCL::*BUILT-IN-TYPEP-COST*
SB-PCL::*CACHE-EXPAND-THRESHOLD*
SB-PCL::*ENABLE-DFUN-CONSTRUCTOR-CACHING*
SB-PCL::*ENABLE-EMF-CALL-TRACING-P*
SB-PCL::*EQL-SPECIALIZER-TABLE*
-SB-PCL::*FIND-CLASS*
SB-PCL::*GLOBAL-EFFECTIVE-METHOD-GENSYMS*
SB-PCL::*IN-GF-ARG-INFO-P*
SB-PCL::*IN-PRECOMPUTE-EFFECTIVE-METHODS-P*
SB-DEBUG::*NESTED-DEBUG-CONDITION*
SB-DEBUG::*STEP-BREAKPOINTS*
SB-DEBUG::*DEBUG-RESTARTS*
-SB-DEBUG::*CACHED-FORM-NUMBER-TRANSLATIONS*
SB-DEBUG::*BREAKPOINTS*
SB-DEBUG::*TRACED-FUNS*
SB-DEBUG::*DEBUG-COMMANDS*
SB-DI::*IR1-BLOCK-DEBUG-BLOCK*
SB-DI::*OTHER-PARSING-BUFFER*
SB-DI::*COMPILED-DEBUG-FUNS*
-SB-DI::*FORM-NUMBER-TEMP*
SB-DI::*COMPONENT-BREAKPOINT-OFFSETS*
SB-DI::*FUN-END-COOKIES*
SB-DI::*FORM-NUMBER-CIRCULARITY-TABLE*