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definitions=10101 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxlogscore=864 bulkscore=0 suspectscore=0 mlxscore=0 phishscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109030001 definitions=main-2109090096 X-Proofpoint-GUID: 8SpFM3oFU9HVdPq1L0XQylq66KTwc6Uw X-Proofpoint-ORIG-GUID: 8SpFM3oFU9HVdPq1L0XQylq66KTwc6Uw Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 09, 2021 at 04:04:29PM +0100, Will Deacon wrote: > On Wed, Sep 08, 2021 at 04:52:39PM +0800, kernel test robot wrote: > > FYI, we noticed the following commit (built with gcc-9): > > > > commit: 461021875c5057b3a408db0aa91b15119064ffa8 ("swiotlb: Add restricted DMA pool initialization") > > https://git.kernel.org/cgit/linux/kernel/git/konrad/swiotlb.git devel/for-linus-5.14 > > > > > > in testcase: boot > > > > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): > > > > > > > > If you fix the issue, kindly add following tag > > Reported-by: kernel test robot > > > > > > [ 157.633812][ T1] BUG: kernel NULL pointer dereference, address: 00000046 > > [ 157.636589][ T1] #PF: supervisor read access in kernel mode > > [ 157.637641][ T1] #PF: error_code(0x0000) - not-present page > > [ 157.637641][ T1] *pde = 00000000 > > [ 157.643000][ T1] Oops: 0000 [#1] SMP > > [ 157.643000][ T1] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W 5.12.0-rc3-00029-g461021875c50 #1 > > [ 157.643000][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 > > [ 157.650987][ T1] EIP: __dma_direct_alloc_pages+0xee/0x280 > > [ 157.650987][ T1] Code: d2 f6 c1 20 0f 94 c0 0f 95 c2 d3 e0 d3 e2 83 c0 ff 83 d2 ff 39 f0 89 d0 19 f8 0f 92 c0 0f b6 c0 8d 44 40 01 8b 93 c0 02 00 00 <80> 7a 46 00 74 6c 8b 7d ec 89 d8 89 fa e8 c0 34 00 00 89 c6 85 c0 > > [ 157.658987][ T1] EAX: 00000004 EBX: c2713884 ECX: 00000018 EDX: 00000000 > > [ 157.658987][ T1] ESI: ffffffff EDI: 00000000 EBP: c1c43d2c ESP: c1c43d10 > > [ 157.658987][ T1] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010297 > > [ 157.666985][ T1] CR0: 80050033 CR2: 00000046 CR3: 1b1da000 CR4: 000406d0 > > [ 157.666985][ T1] Call Trace: > > [ 157.666985][ T1] dma_direct_alloc+0x50/0x180 > > [ 157.674977][ T1] dma_alloc_attrs+0x69/0xc0 > > [ 157.674977][ T1] ide_allocate_dma_engine+0x55/0x80 > > This IDE code doesn't exist upstream any more. See b7fb14d3ac63 ("ide: remove > the legacy ide driver"). Let me kill that branch since we never pushed that to Linus. > > Will