<jemalloc>: jemalloc_arena.c:182: Failed assertion: "p[i] == 0"

After applying Dimitry Andric's patches to contrib/jemalloc and replacing
/usr/bin/as with one built last Sunday, I was finally(!) able to rebuild
head as of 234536:

FreeBSD freebeast.catwhisker.org 10.0-CURRENT FreeBSD 10.0-CURRENT #797 234536M: Sat Apr 21 10:23:33 PDT 2012     root_at_freebeast.catwhisker.org:/usr/obj/usr/src/sys/GENERIC  i386

However, as I was copying a /usr/obj hierarchy via tar -- e.g.:

root_at_freebeast:/common/home/david # (cd /var/tmp && rm -fr obj && mkdir obj) && (cd /usr && tar cpf - obj) | (cd /var/tmp && tar xpf -)

it ran for a while, then:

<jemalloc>: jemalloc_arena.c:182: Failed assertion: "p[i] == 0"
Abort (core dumped) 
root_at_freebeast:/common/home/david # echo $?
134
root_at_freebeast:/common/home/david # ls -lTio *.core
ls: No match.
root_at_freebeast:/common/home/david # 

So ... no core file, apparently.

freebeast(10.0-C)[2] find /usr/src/contrib/jemalloc -type f -name jemalloc_arena.c
freebeast(10.0-C)[3] 

No file named "jemalloc_arena.c", either.

But contrib/jemalloc/src/arena.c contains a function,
arena_chunk_validate_zeroed():

    175 static inline void
    176 arena_chunk_validate_zeroed(arena_chunk_t *chunk, size_t run_ind)
    177 {
    178         size_t i;
    179         UNUSED size_t *p = (size_t *)((uintptr_t)chunk + (run_ind << LG_PAGE));
    180
    181         for (i = 0; i < PAGE / sizeof(size_t); i++)
    182                 assert(p[i] == 0);
    183 }

Thoughts?

Peace,
david
-- 
David H. Wolfskill				david_at_catwhisker.org
Depriving a girl or boy of an opportunity for education is evil.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.