http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45375
--- Comment #17 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-12 23:52:52 UTC --- Current mainline crashes: Program received signal SIGSEGV, Segmentation fault. lto_cgraph_replace_node (slot=<value optimized out>, data=<value optimized out>) at ../../gcc/lto-symtab.c:227 227 if (prevailing_node->same_body_alias) (gdb) bt #0 lto_cgraph_replace_node (slot=<value optimized out>, data=<value optimized out>) at ../../gcc/lto-symtab.c:227 #1 lto_symtab_merge_cgraph_nodes_1 (slot=<value optimized out>, data=<value optimized out>) at ../../gcc/lto-symtab.c:798 #2 0x0000000000b0ae08 in htab_traverse_noresize (htab=<value optimized out>, callback=0x60eca0 <lto_symtab_merge_cgraph_nodes_1>, info=0x0) at ../../libiberty/hashtab.c:784 #3 0x00000000004aabf9 in read_cgraph_and_symbols () at ../../gcc/lto/lto.c:2213 #4 lto_main () at ../../gcc/lto/lto.c:2438 #5 0x00000000006cb658 in compile_file (argc=2627, argv=0x11a7460) at ../../gcc/toplev.c:579 #6 do_compile (argc=2627, argv=0x11a7460) at ../../gcc/toplev.c:1874 #7 toplev_main (argc=2627, argv=0x11a7460) at ../../gcc/toplev.c:1937 #8 0x00007ffff6597bc6 in __libc_start_main () from /lib64/libc.so.6 #9 0x0000000000493411 in _start () at ../sysdeps/x86_64/elf/start.S:113 I guess it is fallout of the merging patch. It is weird since previaling_node is NULL. _moz_cairo_surface_destroy/567259(-1) @0x7ffebef47c60 (asm: _moz_cairo_surface_destroy) visibilit: 2 binds_local called by: CreateSimilarSurface/567227 (0.21 per call) CreateSimilarSurface/567227 (0.14 per call) Init/567225 (0.39 per call) _ZN11gfxASurface7ReleaseEv.part.2/567209 (1.00 per call) calls: References: Refering this function: $5 = void I also generated profile. samples % image name app name symbol name 228038 25.3225 lto1 lto1 htab_find_slot_with_hash 82588 9.1710 lto1 lto1 iterative_hash_hashval_t 58000 6.4406 lto1 lto1 type_pair_eq 32557 3.6153 lto1 lto1 gimple_lookup_type_leader 31622 3.5115 lto1 lto1 gtc_visit 29149 3.2369 lto1 lto1 htab_expand 27463 3.0496 lto1 lto1 gimple_type_hash_1 24348 2.7037 lto1 lto1 gimple_types_compatible_p 24217 2.6892 lto1 lto1 inflate_fast 21984 2.4412 lto1 lto1 gimple_types_compatible_p_1 21796 2.4203 libc-2.11.1.so libc-2.11.1.so memset 21700 2.4097 libc-2.11.1.so libc-2.11.1.so _int_malloc 17894 1.9870 lto1 lto1 lookup_type_pair.isra.120.constprop.129 16087 1.7864 lto1 lto1 ggc_set_mark 15719 1.7455 lto1 lto1 gt_ggc_mx_lang_tree_node Our abuse of hashing is making us slow. It is not only type merging but all the hashing during streaming in.
