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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: ec36920d-7f0a-4889-0386-08d78a5f7297 X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Dec 2019 23:58:04.7229 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: DElx2OlbEhjYxNpxT7R1HYuE3jkFK1H0CRl0DhaFna2KtzTnntqa79ezq9A8PnBT X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB3047 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-26_05:2019-12-24,2019-12-26 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 malwarescore=0 priorityscore=1501 suspectscore=0 bulkscore=0 impostorscore=0 clxscore=1011 adultscore=0 phishscore=0 mlxlogscore=944 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912260212 X-FB-Internal: deliver X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Dec 26, 2019 at 09:41:30PM +0000, Christopher Lameter wrote: > On Mon, 23 Dec 2019, Andrew Morton wrote: >=20 > > Guys, did we make recent changes in this area? >=20 > Yes the cgroup folks did. f.e. >=20 > commit 04f768a39d55967246c002aa66b407b3bfdd8269 > Author: Waiman Long > Date: Mon Sep 23 15:33:46 2019 -0700 >=20 > mm, slab: extend slab/shrink to shrink all memcg caches I'd be surprised if the issue is caused by using of this very new interface. But it would be an easy thing... >=20 > Currently, a value of '1" is written to /sys/kernel/slab//shrin= k > file to shrink the slab by flushing out all the per-cpu slabs and fre= e > slabs in partial lists. This can be useful to squeeze out a bit more > memory under extreme condition as well as making the active object > counts > in /proc/slabinfo more accurate. >=20 > This usually applies only to the root caches, as the SLUB_ME > Otherwise I bet on some race around s->kobj.state_in_sysfs . It interesting that it reproduces on a single cpu i386 machine. I really wonder what makes it different. Dennis, can you, please, insert some debug printing into sysfs_slab_remove_workfn()? I wonder if it's really called twice and where exactly it panics? Thanks!