From: Michael Ellerman <mpe@ellerman•id.au>
To: vrbagal1 <vrbagal1@linux•vnet.ibm.com>,
Nicholas Piggin <npiggin@gmail•com>
Cc: linux-fsdevel@vger•kernel.org,
sachinp <sachinp@linux•vnet.ibm.com>,
linuxppc-dev <linuxppc-dev@lists•ozlabs.org>,
Linuxppc-dev
<linuxppc-dev-bounces+vrbagal1=linux.vnet.ibm.com@lists•ozlabs.org>
Subject: Re: [powerpc/powervm]Oops: Kernel access of bad area, sig: 11 [#1] while running stress-ng
Date: Tue, 10 Jul 2018 23:42:00 +1000 [thread overview]
Message-ID: <877em3b42f.fsf@concordia.ellerman.id.au> (raw)
In-Reply-To: <920d9bc6a2c3449700dec191c271bdff@linux.vnet.ibm.com>
vrbagal1 <vrbagal1@linux•vnet.ibm.com> writes:
> On 2018-07-10 13:37, Nicholas Piggin wrote:
>> On Tue, 10 Jul 2018 11:58:40 +0530
>> vrbagal1 <vrbagal1@linux•vnet.ibm.com> wrote:
>>
>>> Hi,
>>>
>>> Observing kernel oops on Power9(ZZ) box, running on PowerVM, while
>>> running stress-ng.
>>>
>>>
>>> Kernel: 4.18.0-rc4
>>> Machine: Power9 ZZ (PowerVM)
>>> Test: Stress-ng
>>>
>>> Attached is .config file
>>>
>>> Traces:
>>>
>>> [12251.245209] Oops: Kernel access of bad area, sig: 11 [#1]
>>
>> Can you post the lines above this? Otherwise we don't know what address
>> it tried to access (without decoding the instructions and
>> reconstructing
>> it from registers at least, which the XFS devs wouldn't be inclined to
>> do).
>>
>
> ah my bad.
>
> [12251.245179] Unable to handle kernel paging request for data at address 0x6000000060000000
> [12251.245199] Faulting instruction address: 0xc000000000319e2c
Which matches the regs & disassembly:
r4 = 6000000060000000
r9 = 0
ldx r9,r4,r9 <- pop
So object was 0x6000000060000000.
That looks like two nops, ie. we got some code?
And there's only one caller of prefetch_freepointer() in slab_alloc_node():
prefetch_freepointer(s, next_object);
So slab corruption is looking likely.
Do you have slub_debug=FZP on the kernel command line?
cheers
next prev parent reply other threads:[~2018-07-10 13:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-10 6:28 [powerpc/powervm]Oops: Kernel access of bad area, sig: 11 [#1] while running stress-ng vrbagal1
2018-07-10 8:07 ` Nicholas Piggin
2018-07-10 10:11 ` vrbagal1
2018-07-10 13:42 ` Michael Ellerman [this message]
2018-07-19 6:17 ` vrbagal1
2018-07-19 13:33 ` Brian Foster
2018-07-20 6:02 ` vrbagal1
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