https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68392
Bug ID: 68392 Summary: ICE: SIGSEGV in update_uses (fwprop.c:896) with -fno-checking Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: zsojka at seznam dot cz Target Milestone: --- Created attachment 36743 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36743&action=edit reduced testcase Compiler output: $ aarch64-unknown-linux-gnu-gcc -O -fno-checking testcase.c -wrapper valgrind,-q,--num-callers=40 ==16356== Invalid read of size 8 ==16356== at 0x111163A: sparseset_bit_p (sparseset.h:143) ==16356== by 0x111163A: update_uses (fwprop.c:896) ==16356== by 0x111163A: update_df(rtx_insn*, rtx_def*) (fwprop.c:919) ==16356== by 0x11127FC: try_fwprop_subst(df_ref_d*, rtx_def**, rtx_def*, rtx_insn*, bool) (fwprop.c:1007) ==16356== by 0x1112F2A: forward_propagate_and_simplify (fwprop.c:1321) ==16356== by 0x1112F2A: forward_propagate_into(df_ref_d*) (fwprop.c:1374) ==16356== by 0x1113C24: fwprop (fwprop.c:1457) ==16356== by 0x1113C24: (anonymous namespace)::pass_rtl_fwprop::execute(function*) (fwprop.c:1490) ==16356== by 0xA29FF7: execute_one_pass(opt_pass*) (passes.c:2325) ==16356== by 0xA2A597: execute_pass_list_1(opt_pass*) (passes.c:2398) ==16356== by 0xA2A5A9: execute_pass_list_1(opt_pass*) (passes.c:2399) ==16356== by 0xA2A5F4: execute_pass_list(function*, opt_pass*) (passes.c:2409) ==16356== by 0x703593: cgraph_node::expand() (cgraphunit.c:1965) ==16356== by 0x704E95: expand_all_functions (cgraphunit.c:2101) ==16356== by 0x704E95: symbol_table::compile() (cgraphunit.c:2450) ==16356== by 0x706D85: symbol_table::finalize_compilation_unit() (cgraphunit.c:2540) ==16356== by 0xB2A1D3: compile_file() (toplev.c:489) ==16356== by 0x56C7BD: do_compile (toplev.c:1951) ==16356== by 0x56C7BD: toplev::main(int, char**) (toplev.c:2058) ==16356== by 0x56E576: main (main.c:39) ==16356== Address 0x18 is not stack'd, malloc'd or (recently) free'd ==16356== testcase.c: In function 'foo': testcase.c:8:1: internal compiler error: Segmentation fault } ^ Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. $ aarch64-unknown-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=/mnt/svn/gcc-trunk/binary-latest-aarch64/bin/aarch64-unknown-linux-gnu-gcc COLLECT_LTO_WRAPPER=/mnt/svn/gcc-trunk/binary-230409-checking-release-nographite-aarch64/libexec/gcc/aarch64-unknown-linux-gnu/6.0.0/lto-wrapper Target: aarch64-unknown-linux-gnu Configured with: /mnt/svn/gcc-trunk//configure --enable-checking=release --enable-languages=c,c++ --prefix=/mnt/svn/gcc-trunk/binary-230409-checking-release-nographite-aarch64/ --without-cloog --without-ppl --without-isl --host=x86_64-pc-linux-gnu --target=aarch64-unknown-linux-gnu --build=x86_64-pc-linux-gnu --with-sysroot=/home/aarch64-chroot --with-as=/usr/libexec/gcc/aarch64-unknown-linux-gnu/as --with-ld=/usr/libexec/gcc/aarch64-unknown-linux-gnu/ld Thread model: posix gcc version 6.0.0 20151116 (experimental) (GCC) I don't have any other recent GCC by hand than this aarch64 crosscompiler, configured with --enable-checking=yes,rtl,df Tested revisions: r230409 - ICE