https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113464
--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> --- Created attachment 57128 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57128&action=edit testcase triggering SIGSEGV at -O0 Slightly different testcase, triggers SIGSEGV at -O0 at a similar place: $ x86_64-pc-linux-gnu-gcc testcase2.c -wrapper valgrind,-q ==8413== Invalid read of size 8 ==8413== at 0x271971F: var_to_partition (tree-ssa-live.h:163) ==8413== by 0x271971F: lower_asm (gimple-lower-bitint.cc:5199) ==8413== by 0x271971F: (anonymous namespace)::bitint_large_huge::lower_stmt(gimple*) (gimple-lower-bitint.cc:5236) ==8413== by 0x271BB69: gimple_lower_bitint() (gimple-lower-bitint.cc:6534) ==8413== by 0x13CBE7A: execute_one_pass(opt_pass*) (passes.cc:2646) ==8413== by 0x13CC76F: execute_pass_list_1(opt_pass*) (passes.cc:2755) ==8413== by 0x13CC7A8: execute_pass_list(function*, opt_pass*) (passes.cc:2766) ==8413== by 0xFCC675: expand (cgraphunit.cc:1842) ==8413== by 0xFCC675: cgraph_node::expand() (cgraphunit.cc:1795) ==8413== by 0xFCD589: output_in_order (cgraphunit.cc:2192) ==8413== by 0xFCD589: symbol_table::compile() [clone .part.0] (cgraphunit.cc:2396) ==8413== by 0xFD0537: compile (cgraphunit.cc:2312) ==8413== by 0xFD0537: symbol_table::finalize_compilation_unit() (cgraphunit.cc:2584) ==8413== by 0x150E111: compile_file() (toplev.cc:474) ==8413== by 0xDE6E6B: do_compile (toplev.cc:2152) ==8413== by 0xDE6E6B: toplev::main(int, char**) (toplev.cc:2308) ==8413== by 0xDE864A: main (main.cc:39) ==8413== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==8413== during GIMPLE pass: bitintlower0 testcase2.c: In function 'bar': testcase2.c:2:1: internal compiler error: Segmentation fault 2 | bar(void) | ^~~ 0x150dc2f crash_signal /repo/gcc-trunk/gcc/toplev.cc:317 0x271971f var_to_partition(_var_map*, tree_node*) /repo/gcc-trunk/gcc/tree-ssa-live.h:163 0x271971f lower_asm /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:5199 0x271971f lower_stmt /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:5236 0x271bb69 gimple_lower_bitint /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:6534 Please submit a full bug report, with preprocessed source (by using -freport-bug). Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions.
