[Bug tree-optimization/54735] New: [4.8 Regression] Segmentation fault in walk_aliased_vdefs_1

[markus at trippelsdorf dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54735



             Bug #: 54735

           Summary: [4.8 Regression] Segmentation fault in

                    walk_aliased_vdefs_1

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: tree-optimization

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: mar...@trippelsdorf.de





The testcase from Bug 54146 segfaults on trunk (r191824):



% gdb g++

Reading symbols from /usr/bin/g++...(no debugging symbols found)...done.

(gdb) run slow.cc -c -w -O2

Starting program: /usr/bin/g++ slow.cc -frounding-math -c -w -O2

warning: no loadable sections found in added symbol-file system-supplied DSO at

0x7ffff7ffa000

process 2999 is executing new program:

/usr/x86_64-pc-linux-gnu/gcc-bin/4.8.0/g++

[New process 3002]

process 3002 is executing new program:

/usr/libexec/gcc/x86_64-pc-linux-gnu/4.8.0/cc1plus



Program received signal SIGSEGV, Segmentation fault.

[Switching to process 3002]

0x00000000008c3b58 in walk_aliased_vdefs_1(ao_ref_s*, tree_node*, bool

(*)(ao_ref_s*, tree_node*, void*), void*, bitmap_head_def**, unsigned int)

[clone .constprop.15] ()

(gdb) bt

#0  0x00000000008c3b58 in walk_aliased_vdefs_1(ao_ref_s*, tree_node*, bool

(*)(ao_ref_s*, tree_node*, void*), void*, bitmap_head_def**, unsigned int)

[clone .constprop.15] ()

#1  0x00000000008c459e in walk_aliased_vdefs(ao_ref_s*, tree_node*, bool

(*)(ao_ref_s*, tree_node*, void*), void*, bitmap_head_def**) ()

#2  0x00000000008d0dee in propagate_necessity(edge_list*) () at

/home/markus/gcc/gcc/tree-ssa-dce.c:909

#3  0x00000000008d1da2 in perform_tree_ssa_dce(bool) () at

/home/markus/gcc/gcc/tree-ssa-dce.c:1584

#4  0x00000000007c86b2 in execute_one_pass(opt_pass*) () at

/home/markus/gcc/gcc/passes.c:2199

#5  0x00000000007c8a15 in execute_pass_list(opt_pass*) () at

/home/markus/gcc/gcc/passes.c:2254

#6  0x00000000007c8a27 in execute_pass_list(opt_pass*) () at

/home/markus/gcc/gcc/passes.c:2255

#7  0x000000000064f204 in expand_function(cgraph_node*) ()

#8  0x00000000006506ba in compile() ()

#9  0x0000000000650c25 in finalize_compilation_unit() ()

#10 0x00000000005290b7 in cp_write_global_declarations() () at

/home/markus/gcc/gcc/cp/decl2.c:4024

#11 0x0000000000858a05 in compile_file() ()

#12 0x000000000085a20a in toplev_main(int, char**) ()