From: Sasha Levin <sasha.levin@oracle.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>,
"david S. Miller" <davem@davemloft.net>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Dave Jones <davej@redhat.com>,
dave@stgolabs.net
Subject: Re: mm: NULL ptr deref in unlink_file_vma
Date: Mon, 22 Dec 2014 13:05:13 -0500 [thread overview]
Message-ID: <54985D59.5010506@oracle.com> (raw)
In-Reply-To: <20141222180102.GA8072@node.dhcp.inet.fi>
On 12/22/2014 01:01 PM, Kirill A. Shutemov wrote:
> On Mon, Dec 22, 2014 at 10:04:02AM -0500, Sasha Levin wrote:
>> > Hi all,
>> >
>> > While fuzzing with trinity inside a KVM tools guest running the latest -next
>> > kernel, I've stumbled on the following spew:
>> >
>> > [ 432.376425] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
>> > [ 432.378876] IP: down_write (./arch/x86/include/asm/rwsem.h:105 ./arch/x86/include/asm/rwsem.h:121 kernel/locking/rwsem.c:71)
> Looks like vma->vm_file->mapping is NULL. Somebody freed ->vm_file from
> under us?
>
> I suspect Davidlohr's patchset on i_mmap_lock, but I cannot find any code
> path which could lead to the crash.
I've reported a different issue which that patchset: https://lkml.org/lkml/2014/12/9/741
I guess it could be related?
Thanks,
Sasha
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next prev parent reply other threads:[~2014-12-22 18:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-22 15:04 Sasha Levin
2014-12-22 18:01 ` Kirill A. Shutemov
2014-12-22 18:04 ` Kirill A. Shutemov
2014-12-22 19:04 ` Davidlohr Bueso
2014-12-22 20:38 ` Sasha Levin
2014-12-22 18:05 ` Sasha Levin [this message]
2014-12-22 19:14 ` Kirill A. Shutemov
2014-12-22 22:12 ` Davidlohr Bueso
2015-02-10 18:42 ` Konstantin Khlebnikov
2015-02-11 12:22 ` Kirill A. Shutemov
2015-02-12 13:42 ` Konstantin Khlebnikov
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