[Bug c/67649] New: trunk build with valgrind fail in get_def_blocks_for

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67649

            Bug ID: 67649
           Summary: trunk build with valgrind fail in get_def_blocks_for
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

I just tried to build gcc trunk of today (20150920) on x86_64
and got this:

/home/dcb/gcc/working/./gcc/xgcc -B/home/dcb/gcc/working/./gcc/
-B/home/dcb/gcc/results/x86_64-pc-linux-gnu/bin/
-B/home/dcb/gcc/results/x86_64-pc-linux-gnu/lib/ -isystem
/home/dcb/gcc/results/x86_64-pc-linux-gnu/include -isystem
/home/dcb/gcc/results/x86_64-pc-linux-gnu/sys-include    -g -O3 -march=native
-O2  -g -O3 -march=native -DIN_GCC    -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition 
-isystem ./include   -fpic -mlong-double-80 -DUSE_ELF_SYMVER -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector   -fpic -mlong-double-80
-DUSE_ELF_SYMVER -I. -I. -I../.././gcc -I../../../src/trunk/libgcc
-I../../../src/trunk/libgcc/. -I../../../src/trunk/libgcc/../gcc
-I../../../src/trunk/libgcc/../include
-I../../../src/trunk/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS  -DUSE_TLS -o _ashldi3.o -MT _ashldi3.o -MD -MP -MF _ashldi3.dep
-DL_ashldi3 -c ../../../src/trunk/libgcc/libgcc2.c -fvisibility=hidden
-DHIDE_EXPORTS
==9820== Invalid write of size 8
==9820==    at 0x670401: bitmap_initialize_stat (bitmap.h:332)
==9820==    by 0x670401: bitmap_obstack_alloc_stat(bitmap_obstack*)
(bitmap.c:286)
==9820==    by 0xAEB9B3: get_def_blocks_for (tree-into-ssa.c:489)
==9820==    by 0xAEB9B3: set_livein_block (tree-into-ssa.c:543)