https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82614
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to Marco Castelluccio from comment #3) > > Thanks for the report Marco. Looks it comes from Firefox, am I right? > > Yes, that's correct. Actually, from a build of the JS shell. > > > Which version of GCC have you been using? > > The build was done with "gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609". > > We were also able to reproduce the crash with a gcda generated normally, > without __gcov_dump. I see, not the GCC 5.x is not longer supported. Anyway, please paste backtrace from gcov when the segfaults happens. I did quite some fixes to gcov that are included in GCC 7.x branch. Can you please test a new release?