When running jtreg tests on macOS aarch64 with ubsanized binaries, the following error is reported :
jdk/src/hotspot/share/logging/logSelection.cpp:154:24: runtime error: applying non-zero offset 1 to null pointer
UndefinedBehaviorSanitizer:DEADLYSIGNAL
UndefinedBehaviorSanitizer: nested bug in the same thread, aborting.
(XCode 13.1 was used)

This can be seen e.g. in these jdk jtreg tests :
jdk/internal/misc/CDS/ArchivedEnumTest.java
jdk/jfr/event/gc/collection/TestGCGarbageCollectionEvent.java
jdk/jfr/startupargs/TestDumpOnExit.java

There is another issue observed here (also when running on macOS aarch64) , seems this happens in the for loop when incrementing comma_pos
" for (char *comma_pos = copy, *cur = copy; success && comma_pos != nullptr; cur = comma_pos + 1) { ..."

src/hotspot/share/logging/logSelectionList.cpp:72:94: runtime error: applying non-zero offset 1 to null pointer
UndefinedBehaviorSanitizer:DEADLYSIGNAL
UndefinedBehaviorSanitizer: nested bug in the same thread, aborting.