Steven Bosscher wrote:
On Sat, Aug 18, 2012 at 9:01 AM, Tobias Burnus <bur...@net-b.de> wrote:
I think it's your patch which breaks bootstrapping here:
Program received signal SIGSEGV, Segmentation fault.
0x00000000005bfa40 in bitmap_obstack_free (map=0x18693a0) 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 *) 0x9090909090909090
Thus, your patch assumes that malloc returns nullified memory, but e.g. with
MALLOC_PERTURB_ set, that's not the case.
If my patch broke this, it was broken before also. I only added a few
more bitmap obstacks, but there were lots of existing ones before the
patch.
Maybe, but MALLOC_PERTURB_ builds were successful since years –
including my Friday morning build (though, I didn't do a bootstrap). My
last full bootstrap was on 2012-08-15 and a FreeBSD jemalloc's junk
filling build was done by Steve on the 10th.
Thus, either there is a fairly new bug or some change made an old bug
surface. I also haven't bisected, thus it could also be some other patch.
Can you file a big report with a test case and instructions to
reproduce, so that I can have a look?
I filled a small bug report at
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54313
I hope it is sufficient. If you need more, please tell me.
Tobias
