http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54313
Bug #: 54313 Summary: [4.8 Regression] GCC fails to bootstrap with MALLOC_PERTURB – Segfault in bitmap_obstack_free Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Keywords: build, ice-on-valid-code Severity: normal Priority: P3 Component: middle-end AssignedTo: unassig...@gcc.gnu.org ReportedBy: bur...@gcc.gnu.org CC: ste...@gcc.gnu.org If malloc doesn't return nullified memory, bootstrapping fails as soon as the stage1 compiler is used to build libgcc. To reproduce: With GLIBC, simply set export MALLOC_PERTURB_=163 and on FreeBSD, use jemalloc with junk filling. Then either bootstrap, which will fail at the first use of the stage1 compiler, i.e. when building the first libgcc file. Or if you already have a bootstrapped compiler: $ cat test.c int main () { return 0; } $ gcc -c -O test.c test.c: In function 'main': test.c:3:1: internal compiler error: Segmentation fault } ^ Please submit a full bug report, That fails in: $ gdb --args ~/projects/gcc-git/gcc-build/gcc/cc1 -O test.c ... Program received signal SIGSEGV, Segmentation fault. 0x0000000000600f52 in bitmap_obstack_free (map=0x157e5d0) at /projects/tob/gcc-git/gcc/gcc/bitmap.c:388 388 map->first = (bitmap_element *) map->obstack->heads; (gdb) p map->obstack $1 = (bitmap_obstack *) 0xa3a3a3a3a3a3a3a3 (gdb) bt #0 0x0000000000600f52 in bitmap_obstack_free (map=0x157e5d0) at /projects/tob/gcc-git/gcc/gcc/bitmap.c:388 #1 0x0000000000ce5f46 in dse_step7 () at /projects/tob/gcc-git/gcc/gcc/dse.c:3826 #2 rest_of_handle_dse () at /projects/tob/gcc-git/gcc/gcc/dse.c:3891 #3 0x0000000000868fef in execute_one_pass (pass=pass@entry=0x14483a0 <pass_rtl_dse1>) at /projects/tob/gcc-git/gcc/gcc/passes.c:2157 #4 0x00000000008693a5 in execute_pass_list (pass=0x14483a0 <pass_rtl_dse1>) at /projects/tob/gcc-git/gcc/gcc/passes.c:2212 #5 0x00000000008693b7 in execute_pass_list (pass=0x1443220 <pass_rest_of_compilation>) at /projects/tob/gcc-git/gcc/gcc/passes.c:2213 #6 0x0000000000669b38 in expand_function (node=0x2aaaac192750) at /projects/tob/gcc-git/gcc/gcc/cgraphunit.c:1609 #7 0x000000000066b9da in expand_all_functions () at /projects/tob/gcc-git/gcc/gcc/cgraphunit.c:1714 #8 compile () at /projects/tob/gcc-git/gcc/gcc/cgraphunit.c:2012 #9 0x000000000066bfd5 in finalize_compilation_unit () at /projects/tob/gcc-git/gcc/gcc/cgraphunit.c:2089 #10 0x0000000000560390 in c_write_global_declarations () at /projects/tob/gcc-git/gcc/gcc/c/c-decl.c:10116 #11 0x000000000090a165 in compile_file () at /projects/tob/gcc-git/gcc/gcc/toplev.c:560 #12 0x000000000090bcda in do_compile () at /projects/tob/gcc-git/gcc/gcc/toplev.c:1863