http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49484
--- Comment #13 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-18 15:41:02 UTC --- Hmm, and as libgcov is static we can end up with multiple copies in shared libraries which means multiple mutexes and thus exposal to the fcntl file-locking ineffectiveness (in this case the library must fork, of course). At least we should not see crashes even in this case because we properly protect the non-shared __gcov_var.
