Hello! Tomáš Čech skribis: > It seems to be easy to crash useradd (from shadow package). Is it on GuixSD? > from strace: > > read(3, "account required pam_deny.so \nau"..., 4096) = 223 > open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/security/pam_deny.so", O_RDONLY|O_CLOEXEC) = 5 > read(5, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\6\0\0\0\0\0\0"..., 832) = 832 > fstat(5, {st_mode=S_IFREG|0555, st_size=6728, ...}) = 0 > mmap(NULL, 2100200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0x7fb8b447c000 > mprotect(0x7fb8b447d000, 2093056, PROT_NONE) = 0 > mmap(0x7fb8b467c000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0) = 0x7fb8b467c000 > close(5) = 0 > --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x7fb8b3d1bda8} --- Could you check in the ‘strace’ output whether PAM modules build with another libc are being loaded? Thanks for your report! Ludo’.