https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79341
--- Comment #4 from Dominik Vogt <vogt at linux dot vnet.ibm.com> --- From <glibc>/sysdeps/s390/dl-tls.h: /* The special thing about the s390 TLS ABI is that we do not have the standard __tls_get_addr function but the __tls_get_offset function which differs in two important aspects: 1) __tls_get_offset gets a got offset instead of a pointer to the tls_index structure 2) __tls_get_offset returns the offset of the requested variable to the thread descriptor instead of a pointer to the variable. */ So, ist a NULL function called here because __tls_get_addr_internal does not exist?
