SUMMARY: AddressSanitizer: 204896 byte(s) leaked in 3198 allocation(s).
SUMMARY: AddressSanitizer: 205184 byte(s) leaked in 3200 allocation(s).
I have seen those as well.
So there does seem to be a problem.
Some (most) of them are warnings, but some are errors which result in program
being aborted. E.g. i cannot really run "make check" since it dies on the very first test.
Many (most | all ?) of them comes with a <<< HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext (longjmp and C++ exceptions *are* supported) >>>