https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108959
--- Comment #2 from David Binderman <dcb314 at hotmail dot com> --- Reduced code seems to be: union U2 { long f0; int f1 }; g_16; g_70[]; static func_61(int) { for (;;) g_70[g_16] = 4; } static func_43(int *p_44) { func_61(*p_44); } main() { union U2 l_38 = {9}; int *l_49 = &l_38; func_43(l_49); }