Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
Message-ID: <e1eb47ea-7327-7565-3a8f-3d9cf4ee904c@oracle.com>
Date:   Tue, 26 Apr 2022 12:24:24 -0500
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.8.0
Subject: Re: [PATCH 5.15 000/124] 5.15.36-rc1 review
Content-Language: en-US
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        torvalds@linux-foundation.org, akpm@linux-foundation.org,
        linux@roeck-us.net, shuah@kernel.org, patches@kernelci.org,
        lkft-triage@lists.linaro.org, pavel@denx.de, jonathanh@nvidia.com,
        f.fainelli@gmail.com, sudipm.mukherjee@gmail.com,
        slade@sladewatkins.com, Waiman Long <longman@redhat.com>
References: <20220426081747.286685339@linuxfoundation.org>
 <09eb98b8-6200-20c2-faa2-ced7f0e4fc95@oracle.com>
 <Ymgxd6WGhUBuntkS@kroah.com>
From:   John Donnelly <John.p.donnelly@oracle.com>
In-Reply-To: <Ymgxd6WGhUBuntkS@kroah.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?N2xVNm95dUU2dnE5dm5ybC9OOGRvbXoxb2FyYlloUUNmNms3M3JLZThvb0Yy?=
 =?utf-8?B?VFpTYkJKZEJDdlRRQWg5dnNvU2FmWmUvVTcyWWVNTXFnd0wvRlRBMWh2MWpP?=
 =?utf-8?B?bFB1M0I3RmFaRGZzL1hJbXN3ZjU3UEErZ3R6ajhSMmc0aTZGTGlrRmhZR3Z1?=
 =?utf-8?B?U3hYbFp5K0p1YklNdktkMkNSTlZNN3dJK1g5dHhsN1l6aGFnK3lVMUhxdEhp?=
 =?utf-8?B?eHRobTJrWG1hS1JhbWR1cVM2bFpVditvQVJEY1k4OFJhRmp2SlpRUWtWUzIw?=
 =?utf-8?B?czlOdXpBQVVpU3lES0JJWXFDdGRjYmJKY2hYZW9sMG02KzA5VmV1aGhsdUxq?=
 =?utf-8?B?M1I1eFNydnZtNTdFWWwrcVRaaEhFOXZUL2grQS8rRXpYSTFTVXdrMVZJUWI0?=
 =?utf-8?B?alQxaEZldTBNTU0vdWZ6T1hnWmpZUkd5U3ZtaGFYb3cwQ1N0aWVRZ1JBK2Ir?=
 =?utf-8?B?L1FVVVp2dCtjUE5rYmRlWkxCYTVkVCtJcEYvUGhPNExmeStVbFNEMVFoN0Vi?=
 =?utf-8?B?OGtsakh5dUppSHlmb3JEd1Z5YU1tUmoxREhJMzBMc3JSQ3RlQVlUTDVMMTRK?=
 =?utf-8?B?WXB1UDVveCttTGpaQktGbEhNQ0NnQlBsRXRub1pTVG9CQ0k2eDNtWGlGdWk2?=
 =?utf-8?B?cjlZUUhTUkhmTVJBL0dvL2VJMkNaOEdLL2tadWk2dEZEL2xmSnlKTjY2VGlm?=
 =?utf-8?B?WldTT1JEbjhGVXFlcmVpcGpscnJnT1ZQRHAxd080MzlTSmhEN3hGbWhFd0Ni?=
 =?utf-8?B?bitleHV0ZmRyQ2JhMzBRdVRmNU1XY0Z3WHVLdEM4azV5N0Nsc2YzTVV4WVlB?=
 =?utf-8?B?clFIY2pxdVc3Rld3YTBoeVlZU0tGZW5LU2RtaWpnajBPODRiTGRuMXlYc3NX?=
 =?utf-8?B?RTIxK2dNNWRrVTY3c1BOaDVvcnBoNGhOcTJOVlVFN2hsMVZWVVpaMnorcVZG?=
 =?utf-8?B?aVRQK1R3azNLcEtpNUlMWTdFc0pNZEZ3WXNQOVdQUE5RNm1tNnpMR0ZzdDBC?=
 =?utf-8?B?Nnh0QlpnTUpZMldXcUJOMUc0ZHdCb2tKRGRWRXBrMTNsS2xhREVKdVArdWNS?=
 =?utf-8?B?dmZsZkRPZnhIVGdnR2liOEhQVTduVWVYMU9wSGVwUzZJeUkvTHR3TGNiZUZu?=
 =?utf-8?B?Tkw1ZjZrWEZTV3dIeHIxaUphTVNxMGtFUW5YNDU1NFNTNHhwSVhQeUdvOWZh?=
 =?utf-8?B?aVN1WnV2YkVrdG44ekN5VSs2ZkRGUGllT1dpMjVEdS9ReDAyaVljVHVQMnk5?=
 =?utf-8?B?aFQ1a1NkaFQ4dlNGbXRsRGhPMkVlNDdHMW1ONmRhWVJqeFNLVGhzVjhDc1Bl?=
 =?utf-8?B?ZWdkbmNuSkdYRXNxMEtuZUpTN1hmSm84ZUFPSWdnK3FqYjRyZVlpb1NMdWdS?=
 =?utf-8?B?cDNSS3BpVU40Mk1tMzlwTzlKVXNRS0RIMmRNNHlpbFJUV2JaTUlrSmJab2Nn?=
 =?utf-8?B?Uk05VDAzUmJLbXZFQkV5ZEZzL0ZSamhnTWJTYUplKzZ3N3hDZ2FCTkhXSU95?=
 =?utf-8?B?UWF3cUgvbXkzTFJSU2ErMlMrUnluMDQrQzZ0M2tzajc5aWpzSDBMd24rNjIz?=
 =?utf-8?B?ZFBGZ1IrdVJDd2dHSS9rRjNxQ2FkTUEzWEd4S21Nd0Y3WGNqTGNVMGFZOTZ3?=
 =?utf-8?B?ekNxck9sd0hhVkQwL1VWODFzMjhNMFJRbTBPL2l0LzhYbWg3aFIvdXhyMlpn?=
 =?utf-8?B?R2x2amtrem1FUUsrbnhpc09xWDFZazEwajlyQ2IwN2VWZEswOWVEMytWaGdO?=
 =?utf-8?B?eklHSUkxWnNKcitNVUlVa2FzaDZIN3cwS0ZLa2E3VTJHSHNzRUtBM01IYXE2?=
 =?utf-8?B?dTE0WU9hOFk2VHNtbDI3SXoyUDVhN04wS1dPcnp0eU9Xam9LRERvWmdZRkdS?=
 =?utf-8?B?RkYyNEtZcFNja0g1eHpRTHZ2azAxY0FObkN2SFhScmQwL2pWelBYWGZ2THhv?=
 =?utf-8?B?UXZxUlBVYmp2bXovVXRqaU5NQVhsOEIybjRjRGhlRkJLV21yYWxaSGVTQjRU?=
 =?utf-8?B?NnhacTI5aVp2Qk9VaVVCMHMzamcrVUtVTTIvUEF1QXdUeDAwbS9pU0JSTlBv?=
 =?utf-8?B?bit1VDEvc3UvYjhhaThIbkdHdmRocXBJVlpyNHFQem9DdUo3MUM2K2FlNnRO?=
 =?utf-8?B?cmozZTB2V1JDRGcrK2J6RURmZU9iNTJJMUc1UmE4ck1uZHBwUjF2VW5GUHNK?=
 =?utf-8?B?SjV6RUQrZytIUG0rMWtibTRvbkFpMkxMMVRHL2FHd1ZlZkxndllTblVBMkM0?=
 =?utf-8?B?MHpuYVh2NVZWRUVHdmRUTFZJZ1ZjMzEzQTNDam5ObXRmS09qNHJGQ0VPbmZS?=
 =?utf-8?B?UHZoYWJ2YVZDZHBCOEJDcjNwclZXVnhVNGJyamUrZnAzSCtoL3MvZHRqaUZ4?=
 =?utf-8?Q?n3BRSAPgFMk7p8uQ=3D?=
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-Network-Message-Id: e2f41559-3058-4f2d-81b3-08da27b21568
X-MS-Exchange-CrossTenant-AuthSource: CO1PR10MB4722.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Apr 2022 18:25:04.5678
 (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: IqqVkSh2AZD8npyvJwTuLuasJiDLt2p/KNH8hFkcD82Mh1n/R2qJkn5CyJ15AzSLdhMcYU58raaxfbrgYX7cAJOBvEnSdRvbb9BSw6u0gmQ=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR10MB1655
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.486,18.0.858
 definitions=2022-04-26_05:2022-04-26,2022-04-26 signatures=0
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 mlxlogscore=999 mlxscore=0
 suspectscore=0 malwarescore=0 spamscore=0 adultscore=0 bulkscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000
 definitions=main-2204260116
X-Proofpoint-GUID: tOlujTw5kG7nAeicLnHt-ae4yrlstRGo
X-Proofpoint-ORIG-GUID: tOlujTw5kG7nAeicLnHt-ae4yrlstRGo
X-Spam-Status: No, score=-3.8 required=5.0 tests=BAYES_00,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,NICE_REPLY_A,RDNS_NONE,SPF_HELO_NONE
	autolearn=unavailable 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: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 4/26/22 12:52 PM, Greg Kroah-Hartman wrote:
> On Tue, Apr 26, 2022 at 12:37:21PM -0500, john.p.donnelly@oracle.com wrote:
>> 76723ed1fb89 2021-12-01 | locking/rwsem: Make handoff bit handling more
>> consistent
>>
>> In Linux 5.15.y.
> 
> That commit is in 5.15.6, released December 1, 2021.  And this just now
> shows up?  How is this related to 5.15.36-rc1?

Hi,

This  was briefly discussed in :

Re: [PATCH v5] locking/rwsem: Make handoff bit handling more consistent

Additional testing shows the rwsem hang still exists.  It takes a 24hr 
fio soak test to show up.

It likely still exists in Linux 5.18.y too. We will be testing that in 
the future as time permits.

> 
> Please start a new thread with the authors/reviewers of that commit and
> we will be glad to discuss it.
> 
> thanks,
> 
> greg k-h

Will do.

Thx