An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in yasm_expr__copy_except() in libyasm/expr.c. Reference: https://github.com/yasm/yasm/issues/174
Created yasm tracking bugs for this issue: Affects: epel-all [bug 2122732] Affects: fedora-all [bug 2122733]
Latest upstream commit 9defefa still affected.