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charset="us-ascii" Content-ID: <24A14B30E444B046A13B24D04E9B502C@namprd10.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR10MB3022.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 84148a59-1a59-46f7-9bb5-08d9fac65a0f X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Feb 2022 14:26:47.0139 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: kW9Vbbqt2/zIkjDb23PD2OdRs+e3ziCE7x9OLyOpVVuZR8spXWKgXJa51YJRVD9SOMLYRwnuX1MiFFhHxJN8Fg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR10MB3720 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10271 signatures=684655 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxscore=0 phishscore=0 bulkscore=0 adultscore=0 spamscore=0 suspectscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202280076 X-Proofpoint-ORIG-GUID: lTVTDOP_3OGlMmyrw_hMbgEuDEOZF52L X-Proofpoint-GUID: lTVTDOP_3OGlMmyrw_hMbgEuDEOZF52L X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Hugh Dickins [220226 18:20]: > On Sat, 26 Feb 2022, Liam Howlett wrote: > > * Nathan Chancellor [220225 18:00]: > > > On Fri, Feb 25, 2022 at 03:46:52PM -0500, Qian Cai wrote: > > > > On Fri, Feb 25, 2022 at 08:23:41PM +0000, Liam Howlett wrote: > > > > > I just booted an arm64 VM with my build and kasan enabled with no= issue. > > > > > Could you please send me your config file for the build? > > > >=20 > > > > On linux-next, I just do: > > > >=20 > > > > $ make arch=3Darm64 defconfig debug.config [1] > > > >=20 > > > > Then, I just generate some memory pressume into swapping/OOM Killer= to > > > > trigger it. > > > >=20 > > > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next= .git/tree/kernel/configs/debug.config > > >=20 > > > Is the stacktrace [1] related to the conflict that Mark encountered [= 2] > > > while merging the maple and folio trees? Booting a next-20220223 kern= el > > > on my Raspberry Pi 3 and 4 shows constant NULL pointer dereferences > > > (just ARCH=3Darm and ARCH=3Darm64 defconfigs) and reverting the folio= and > > > maple tree merges makes everything work properly again. > > >=20 > > > [1]: https://lore.kernel.org/r/YhhRrBpXTFolUAKi@qian/ > > > [2]: https://lore.kernel.org/r/20220224011653.1380557-1-broonie@kerne= l.org/ > >=20 > > Maybe? I'm trying to figure out why it's having issues.. I've not been > > able to reproduce it with just my maple tree branch. Steven Rostedt > > found a bad commit that has been fixed in either 20220224, I believe > > [1]. It might be best to try next-20220225 and see if you have better > > luck if that's an option. > >=20 > > [1]: > > https://lore.kernel.org/linux-fsdevel/f6fb6fd4-dcf2-4326-d25e-9a4a9dad5= 020@fb.com/T/#t >=20 > Hi Liam, I think I have the beginnings of an answer for Qian's issue, > details below; but first off, I'd better make my own opinion clear. >=20 > I think this series, however good it may be so far, is undertested and > not approaching ready for 5.18, and should not have been pushed via > git tree into 5.17-rc-late-stage linux-next, subverting Andrew's mmotm. >=20 > I believe Stephen and Mark should drop it from linux-next for now, > while linux-next stabilizes for 5.18, while you work on testing and > fixing, and resubmit rebased to 5.18-rc1 or -rc2 when you're ready. Hugh, Thank you for your testing, review, and thoughts on the maple tree. I agree with your findings and see the error, although still have difficulty reproducing on amd64 and arm64 VMs. Stephen, Please drop the maple tree from linux-next. Thank you, Liam=