https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65432
Bug ID: 65432 Summary: [5 Regression] Invalid read of size 1: ipa_icf::sem_item_optimizer::merge_classes(unsigned int) (ipa-icf.c:2958) Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: ipa Assignee: unassigned at gcc dot gnu.org Reporter: trippels at gcc dot gnu.org Running the testsuite on ppc64le with an --enable-checking=valgrind compiler shows many instances of: ==94166== Invalid read of size 1 ==94166== at 0x40980F8: strlen (in /usr/lib64/valgrind/vgpreload_memcheck-ppc64le-linux.so) ==94166== by 0x4626503: vfprintf@@GLIBC_2.17 (in /usr/lib64/libc-2.20.so) ==94166== by 0x4631003: fprintf@@GLIBC_2.17 (in /usr/lib64/libc-2.20.so) ==94166== by 0x10CF34B3: ipa_icf::sem_item_optimizer::merge_classes(unsigned int) (ipa-icf.c:2958) ==94166== by 0x10CF962B: ipa_icf::sem_item_optimizer::execute() (ipa-icf.c:2236) ==94166== by 0x10CFC8DF: ipa_icf_driver (ipa-icf.c:3060) ==94166== by 0x10CFC8DF: ipa_icf::pass_ipa_icf::execute(function*) (ipa-icf.c:3107) ==94166== by 0x1068FBC7: execute_one_pass(opt_pass*) (passes.c:2328) ==94166== by 0x10690B53: execute_ipa_pass_list(opt_pass*) (passes.c:2727) ==94166== by 0x1038D2DF: ipa_passes (cgraphunit.c:2207) ==94166== by 0x1038D2DF: symbol_table::compile() (cgraphunit.c:2295) ==94166== by 0x1038ED47: symbol_table::finalize_compilation_unit() (cgraphunit.c:2444) ==94166== by 0x101A31CB: cp_write_global_declarations() (decl2.c:4754) ==94166== by 0x1076894F: compile_file() (toplev.c:608) ==94166== Address 0x701ee20 is 0 bytes inside a block of size 38 free'd ==94166== at 0x4095394: free (in /usr/lib64/valgrind/vgpreload_memcheck-ppc64le-linux.so) ==94166== by 0x10243CAF: cxx_printable_name_internal(tree_node*, int, bool) (tree.c:2026) ==94166== by 0x10374D23: symtab_node::name() const (symtab.c:479) ==94166== by 0x10CF3497: name (ipa-icf.h:177) ==94166== by 0x10CF3497: ipa_icf::sem_item_optimizer::merge_classes(unsigned int) (ipa-icf.c:2958) ==94166== by 0x10CF962B: ipa_icf::sem_item_optimizer::execute() (ipa-icf.c:2236) ==94166== by 0x10CFC8DF: ipa_icf_driver (ipa-icf.c:3060) ==94166== by 0x10CFC8DF: ipa_icf::pass_ipa_icf::execute(function*) (ipa-icf.c:3107) ==94166== by 0x1068FBC7: execute_one_pass(opt_pass*) (passes.c:2328) ==94166== by 0x10690B53: execute_ipa_pass_list(opt_pass*) (passes.c:2727) ==94166== by 0x1038D2DF: ipa_passes (cgraphunit.c:2207) ==94166== by 0x1038D2DF: symbol_table::compile() (cgraphunit.c:2295) ==94166== by 0x1038ED47: symbol_table::finalize_compilation_unit() (cgraphunit.c:2444) ==94166== by 0x101A31CB: cp_write_global_declarations() (decl2.c:4754) ==94166== by 0x1076894F: compile_file() (toplev.c:608)