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charset="us-ascii" Content-ID: <496C23671565EC4484FCEB1DF318F660@namprd04.prod.outlook.com> Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: B8eMJT+BPSNV0ASkBVBk5coEI89mhnePhYzzfk0wb3MxG/Rj3D8xXUIZOk/BqDtAEIKPXtnF+FecwiwHKfvusL3oumyK3O/Jl0u4cL00KB4BweS7Ef/U1fvQouujMzHhN9BE3MHgoF6vtaSBkWL4FwE8MqsmvPz+KXFHrZvM0HGoM4lNHWnhSGV0HHw673ajYcOgsL5wP0wc1yCHiGvxBwAnQKznRz1mPME4YubpKBDY4+k6rNcXhSlO+HTqg/hIioePv/VACo1VZk+hOCQINY3ek9rZnT7OtQzsc3lL0eSBQhPY+JrkBT5DwTTZ7s4c6MPpyNdrNSNzKx/sW5L7crdgBZhkFnYNeaINS/HAvmbn+WBXrxANNzXA4k+NK4+XuHKrdMgs+YNI2EsYLVPzxRBEU7DzA2YPs2P5yT6YLhGgZQX6eAG5RJdVynXWVMPkm/cY0cX0jBwwlPzoWz0v4dpsZ8gcUHsDiBh/SRzPZahM7zyQBVmjD3mIBx7lqyv3ET8vKZIUPWFFv9HkVKQyKXJkIxnvsC8nqOIwmxpdPPPSEuTGr9diOFsdxRgkh6GXY7HSb5pV6jGhfkHibo0sB2vn9esKQjCwegeTFwGTKo4gFDnJmOB2F81hfEw5umJB X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN7PR04MB8532.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: cfeec566-b438-4e9e-e537-08de6566db7c X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Feb 2026 10:02:37.6233 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 02VgIUVlSwMbk+Gwedi0lni2vzZNS7R/SuoGRkGB5pcmx1jIRKUnB01Nm6G29G7jPbF+PkV5HvyNw9HPun3N3gzH4YGSc5NDFE5kFQZcjOI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB7102 On Feb 06, 2026 / 10:33, Matthieu Baerts wrote: > Hi Shinichiro, >=20 > Sorry to jump in, but I *think* our CI for the MPTCP subsystem is > hitting the same issue. Hi Matthieu, > On 30/01/2026 12:16, Shinichiro Kawasaki wrote: > > On Jan 29, 2026 / 15:19, Paul E. McKenney wrote: > > [...] > >>>>> I have seen the static-key pattern called out by Dave Chinner when = running > >>>>> KASAN on large systems. We worked around this by disabling KASAN's= use > >>>>> of static keys. In case you were running KASAN in these tests. > >>>> > >>>> As to KASAN, yes, I enable it in my test runs. I find three static-k= eys under > >>>> mm/kasan/*. I will think if they can be disabled in my test runs. Th= anks. > >>> > >>> There is a set of Kconfig options that disables static branches. If = you > >>> cannot find them quickly, please let me know and I can look them up. > >=20 > > Thank you. But now I know the fix series by Thomas is available. I prio= ritize > > the evaluation of the fix series. Later on, I will try disabling the st= atic-keys > > if it is required. > >=20 > >> > >> And Thomas Gleixner posted an alleged fix to the CID issue here: > >> > >> https://lore.kernel.org/lkml/20260129210219.452851594@kernel.org/ > >> > >> Please let him know whether or not it helps. > >=20 > > Good to see this fix candidate series, thanks :) I have set up the patc= hes and > > started my regular test runs. So far, the hangs have been observed once= or twice > > a week. To confirm the effect of the fix series, I think two weeks runs= will be > > required. Once I get the result, will share it on this thread and with = Thomas. >=20 > I know it is only one week now, but did you see any effects so far? No, I do not see any hang so far. And I hope there will be no hang in the next week either. Fingers crossed... > On > my side, I applied the v2 series -- which has been applied i > tip/sched/urgent -- but I still have issues, and it looks like it is > even more frequent. Maybe what I see is different. If you no longer see > the issues on your side after one week, I'm going to start a new thread > with my issues not to mix them. >=20 > Note that in my case, the issue is visible on a system where nested VMs > are used, with and without KASAN (enabled via debug.config), just after > having started a VSOCK listening socket via socat. I applied the v1 series on top of my test target xfs kernel branches enabli= ng KASAN.