https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98626
Bug ID: 98626 Summary: UBSAN: vec.h:591:30: runtime error: member access within null pointer of type 'struct vec' Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: marxin at gcc dot gnu.org CC: nathan at gcc dot gnu.org Blocks: 63426 Target Milestone: --- I see the following with UBSAN compiler: $ ./xg++ -B. /home/marxin/Programming/gcc/gcc/testsuite/g++.dg/modules/mod-decl-2_a.C -c -fmodules-ts ... $ ./xg++ -B. /home/marxin/Programming/gcc/gcc/testsuite/g++.dg/modules/mod-decl-2_b.C -c -fmodules-ts /home/marxin/Programming/gcc/gcc/testsuite/g++.dg/modules/mod-decl-2_b.C:4:1: error: cannot import module in its own purview 4 | import bob; // { dg-error "cannot import module.* in its own purview" } | ^~~~~~ In module imported at /home/marxin/Programming/gcc/gcc/testsuite/g++.dg/modules/mod-decl-2_b.C:4:1: bob: note: module ‘bob’ declared here /home/marxin/Programming/gcc2/gcc/cp/typeck.c:4024:33: runtime error: member call on null pointer of type 'struct vec' #0 0x1403445 in cp_build_function_call_vec(tree_node*, vec<tree_node*, va_gc, vl_embed>**, int, tree_node*) /home/marxin/Programming/gcc2/gcc/cp/typeck.c:4024 #1 0xfdd5bf in module_add_import_initializers() /home/marxin/Programming/gcc2/gcc/cp/module.cc:18995 #2 0xdc20f9 in start_objects /home/marxin/Programming/gcc2/gcc/cp/decl2.c:3745 #3 0xdc4b3b in generate_ctor_or_dtor_function /home/marxin/Programming/gcc2/gcc/cp/decl2.c:4310 #4 0xdccb6c in c_parse_final_cleanups() /home/marxin/Programming/gcc2/gcc/cp/decl2.c:5234 #5 0x15ae87f in c_common_parse_file() /home/marxin/Programming/gcc2/gcc/c-family/c-opts.c:1233 #6 0x2ccb435 in compile_file /home/marxin/Programming/gcc2/gcc/toplev.c:457 #7 0x2cd3e17 in do_compile /home/marxin/Programming/gcc2/gcc/toplev.c:2193 #8 0x2cd441a in toplev::main(int, char**) /home/marxin/Programming/gcc2/gcc/toplev.c:2332 #9 0x59b3bff in main /home/marxin/Programming/gcc2/gcc/main.c:39 #10 0x7ffff6ce5151 in __libc_start_main (/lib64/libc.so.6+0x28151) #11 0xa82bdd in _start (/home/marxin/Programming/gcc2/objdir/gcc/cc1plus+0xa82bdd) Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426 [Bug 63426] [meta-bug] Issues found with -fsanitize=undefined