http://bugzilla.opensuse.org/show_bug.cgi?id=1042012 Bug ID: 1042012 Summary: Latest gcc 7-1.2 cause crash Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: x86 OS: openSUSE 42.2 Status: NEW Severity: Normal Priority: P5 - None Component: Development Assignee: bnc-team-screening@forge.provo.novell.com Reporter: werner@suse.com QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- Latest gcc in openSUSE Factory cause a segmentation fault with the following code (see function below) void* to_cdata(lua_State* L, int idx, struct ctype* ct) { struct cdata* cd; memset(ct, 0, sizeof(struct ctype)); if (!lua_isuserdata(L, idx) || !lua_getmetatable(L, idx)) { lua_pushnil(L); return NULL; } if (!equals_upval(L, -1, &cdata_mt_key)) { lua_pop(L, 1); /* mt */ lua_pushnil(L); return NULL; } lua_pop(L, 1); /* mt */ cd = (struct cdata*) lua_touserdata(L, idx); if (!cd) { lua_pushnil(L); return NULL; } *ct = cd->type; ^^^^^^^^^^^^^^^^^^^ lua_getuservalue(L, idx); if (ct->is_reference) { return *(void**) (cd+1); } else if (ct->pointers && !ct->is_array) { return *(void**) (cd+1); } else { return cd + 1; } } the assignment does work with gcc-6 flawless. I've also checked the code in the debugger and found that cd->type as well as ct are valid. Don't know if gcc-7 has a flags to allow that pointers in the arguments of a function can be changed within the functions. -- You are receiving this mail because: You are on the CC list for the bug.