From: Andrew Morton <akpm@digeo.com>
To: Petr Vandrovec <vandrove@vc.cvut.cz>
Cc: linux-kernel@vger.kernel.org, Hugh Dickins <hugh@veritas.com>
Subject: Re: Memory modified after freeing in 2.5.63?
Date: Fri, 28 Feb 2003 13:23:22 -0800 [thread overview]
Message-ID: <20030228132322.1ec5689a.akpm@digeo.com> (raw)
In-Reply-To: <20030228150447.GA3862@vana.vc.cvut.cz>
Petr Vandrovec <vandrove@vc.cvut.cz> wrote:
>
> Hi,
> for some time I'm using patch attached at the end of this email,
> which modifies check_poison function to not only verify that
> last byte is POISON_END, but also that all preceeding bytes are
> either POISON_BEFORE or POISON_AFTER bytes.
Nice patch.
> And now when I returned from my month vacation and upgraded
> from 2.5.52 to 2.5.63, when dselect/apt updates dozens of packages,
> I'm getting memory corruption reports as shown below - 22nd byte
> in vm_area_struct - which looks like that VM_ACCOUNT in vm_flags
> is set after vma is freeed... Any clue? Setting VM_ACCOUNT
> in mremap.c:move_vma after calling do_unmap() looks suspicious
> to me, but as I know almost nothing about MM...
Ha! I've been harrassing Hugh over this ;)
Thanks.
next prev parent reply other threads:[~2003-02-28 21:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-28 15:04 Petr Vandrovec
2003-02-28 21:23 ` Andrew Morton [this message]
2003-02-28 21:49 ` Hugh Dickins
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