[Bug tree-optimization/47443] [4.6 Regression] ICE: SSA name in freelist but still referenced or SIGSEGV with -fstack-check=generic

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47443

--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> 2011-01-24 18:35:47 UTC ---
Created attachment 23103
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23103
different crash

$ gcc -O -fstack-check=generic testcase2.c
testcase2.c: In function 'foo':
testcase2.c:13:1: 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.


It crashes at different place, but maybe it's the same problem:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000714225 in fold_comparison (loc=333, code=LT_EXPR,
type=0x7ffff7ed8498, op0=0x7ffff5d4b478, op1=0x7ffff5d4b898)
    at /mnt/svn/gcc-trunk/gcc/fold-const.c:8587
8587      if (POINTER_TYPE_P (TREE_TYPE (arg0))
(gdb) bt
#0  0x0000000000714225 in fold_comparison (loc=333, code=LT_EXPR,
type=0x7ffff7ed8498, op0=0x7ffff5d4b478, 
    op1=0x7ffff5d4b898) at /mnt/svn/gcc-trunk/gcc/fold-const.c:8587
#1  0x00000000006debf1 in fold_binary_loc (loc=333, code=LT_EXPR,
type=0x7ffff7ed8498, op0=0x7ffff5d4b478, 
    op1=0x7ffff5d4b898) at /mnt/svn/gcc-trunk/gcc/fold-const.c:12708
#2  0x00000000006f93a1 in fold_build2_stat_loc (loc=333, code=LT_EXPR,
type=0x7ffff7ed8498, op0=0x7ffff5d4b478, 
    op1=0x7ffff5d4b898) at /mnt/svn/gcc-trunk/gcc/fold-const.c:13982
#3  0x0000000000991baa in forward_propagate_into_gimple_cond
(stmt=0x7ffff5d3c460)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-forwprop.c:422
#4  0x0000000000991edd in tree_ssa_forward_propagate_single_use_vars () at
/mnt/svn/gcc-trunk/gcc/tree-ssa-forwprop.c:2085
#5  0x00000000007f1ba6 in execute_one_pass (pass=0x160d000) at
/mnt/svn/gcc-trunk/gcc/passes.c:1562
#6  0x00000000007f1ea5 in execute_pass_list (pass=0x160d000) at
/mnt/svn/gcc-trunk/gcc/passes.c:1617
#7  0x00000000007f1eb7 in execute_pass_list (pass=0x160c940) at
/mnt/svn/gcc-trunk/gcc/passes.c:1618
#8  0x00000000007f10ac in do_per_function_toporder (callback=0x7f1e90
<execute_pass_list>, data=0x160c880)
    at /mnt/svn/gcc-trunk/gcc/passes.c:1148
#9  0x00000000007f2346 in execute_ipa_pass_list (pass=0x160c9a0) at
/mnt/svn/gcc-trunk/gcc/passes.c:1934
#10 0x0000000000afd391 in ipa_passes () at
/mnt/svn/gcc-trunk/gcc/cgraphunit.c:1725
#11 cgraph_optimize () at /mnt/svn/gcc-trunk/gcc/cgraphunit.c:1797
#12 0x0000000000afd5ea in cgraph_finalize_compilation_unit () at
/mnt/svn/gcc-trunk/gcc/cgraphunit.c:1042
#13 0x000000000050585c in c_write_global_declarations () at
/mnt/svn/gcc-trunk/gcc/c-decl.c:9843
#14 0x00000000008dd544 in compile_file (argc=14, argv=0x7fffffffdad8) at
/mnt/svn/gcc-trunk/gcc/toplev.c:591
#15 do_compile (argc=14, argv=0x7fffffffdad8) at
/mnt/svn/gcc-trunk/gcc/toplev.c:1874
#16 toplev_main (argc=14, argv=0x7fffffffdad8) at
/mnt/svn/gcc-trunk/gcc/toplev.c:1937
#17 0x00007ffff65f1bbd in __libc_start_main () from /lib/libc.so.6
#18 0x00000000004ec455 in _start ()