[reg...@gamow tmp420]$ current-gcc -v Using built-in specs. COLLECT_GCC=current-gcc COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r162143-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ../configure --with-libelf=/usr/local --enable-lto --prefix=/home/regehr/z/compiler-install/gcc-r162143-install --program-prefix=r162143- --enable-languages=c,c++ Thread model: posix gcc version 4.6.0 20100713 (experimental) (GCC)
[reg...@gamow tmp420]$ valgrind -q --trace-children=yes current-gcc -O2 small.c -w ==30337== Invalid read of size 2 ==30337== at 0x697485: walk_stmt_load_store_addr_ops (gimple.c:4776) ==30337== by 0x9B3512: rebuild_cgraph_edges (cgraphbuild.c:471) ==30337== by 0x72D5CD: execute_one_pass (passes.c:1565) ==30337== by 0x72D864: execute_pass_list (passes.c:1620) ==30337== by 0x72CACB: do_per_function_toporder (passes.c:1158) ==30337== by 0x72DC85: execute_ipa_pass_list (passes.c:1920) ==30337== by 0x9B8BF0: cgraph_optimize (cgraphunit.c:1851) ==30337== by 0x9B8E4A: cgraph_finalize_compilation_unit (cgraphunit.c:1171) ==30337== by 0x4A7C32: c_write_global_declarations (c-decl.c:9698) ==30337== by 0x7CED29: toplev_main (toplev.c:990) ==30337== by 0x5935ABC: (below main) (libc-start.c:220) ==30337== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==30337== small.c: In function 'func_4': small.c:29:1: 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. [reg...@gamow tmp420]$ cat small.c int g_19; int *g_42; int **volatile g = &g_42; int g_67[5][9][2][1] = { }; int func_4 (int p_5, unsigned char p_6, unsigned char p_7) { unsigned char l_8[1]; if (p_6) goto lbl_13; for (p_6 = 0; p_6; p_6 = (p_6, 0)) if (0) { } else lbl_13:for (p_6 = 0; p_6 < 1; p_6 += 1) l_8[p_6] = 0; return 0; } int * func_45 (unsigned long p_46, unsigned char p_47) { int *l_56 = &g_19; &l_56 != &g | !1 == func_4 (0, g_67[2][6][1][0], 0) ^ func_4 (1, 0, 0); return 0; } -- Summary: crash due to null pointer deref Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: regehr at cs dot utah dot edu GCC build triplet: x86_64-unknown-linux-gnu GCC host triplet: x86_64-unknown-linux-gnu GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44937
