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Date: Sun, 13 Apr 2008 13:53:44 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: linux-kernel@vger.kernel.org, clameter@sgi.com, penberg@cs.helsinki.fi
Subject: Re: 2.6.25-rc8-mm2: IP: [<ffffffff802868f9>] __kmalloc+0x69/0x110
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On Mon, 14 Apr 2008 00:44:22 +0400 Alexey Dobriyan <adobriyan@gmail.com> wrote:

> Grrr, I was hunting for oopses in dup_fd and near that were plaguing one
> box here for far too long, and hit below.
> 
> What happened if freshly booted box (probably not all init scripts finished),
> X already started. ssh from another box and reboot from session.
> 
> 
> (gdb) p __kmalloc
> $1 = {void *(size_t, gfp_t)} 0xffffffff80286890 <__kmalloc>
> (gdb) l *(0xffffffff80286890 + 0x69)
> 0xffffffff802868f9 is in __kmalloc (mm/slub.c:1663).
> 1658
> 1659                    object = __slab_alloc(s, gfpflags, node, addr, c);
> 1660
> 1661            else {
> 1662                    object = c->freelist;
> 1663      ===>          c->freelist = object[c->offset];   <===
> 1664                    stat(c, ALLOC_FASTPATH);
> 1665            }
> 1666            local_irq_restore(flags);

Yes, I don't think the sub changes are ready for prime-time.

There is a fix in
ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.25-rc8/2.6.25-rc8-mm2/hot-fixes
but it won't help this crash.