https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61408
--- Comment #4 from Kostya Serebryany <kcc at gcc dot gnu.org> --- > > LLVM trunk? > > Have not tried yet. Shall I? asan is being developed in LLVM trunk. So if there is a bug in run-time it's better to investigate the freshest variant in LLVM trunk The fix will have to go there first anyway. If the problem is in GCC instrumentation, then of course, there is no reason to test LLVM. But you say that the problem stared after the libsanitizer merge, so it is likely in run-time. It can be a problem in FF itself or in the way you run it, of course.