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McKenney" CC: Kunwu Chan , "rcu@vger.kernel.org" , "linux-xfs@vger.kernel.org" , hch , Thomas Gleixner Subject: Re: rcu stalls during fstests runs for xfs Thread-Topic: rcu stalls during fstests runs for xfs Thread-Index: AQHcjrclowh1moKuUEq8Mwy02Ri3kbVnWueAgABxzACAANWrgIAAzoQAgABdO4CAAMgvAIAVW9aA Date: Fri, 13 Feb 2026 01:26:32 +0000 Message-ID: References: <13b25e07-d7b8-4b4e-a249-b6826b2eea39@paulmck-laptop> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=wdc.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: SN7PR04MB8532:EE_|DM8PR04MB7879:EE_ x-ms-office365-filtering-correlation-id: 9fc9d74f-1a06-41ce-da82-08de6a9eebf1 x-ld-processed: b61c8803-16f3-4c35-9b17-6f65f441df86,ExtAddr wdcipoutbound: EOP-TRUE x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|376014|366016|1800799024|19092799006|38070700021; 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McKenney wrote: > [...] > > And Thomas Gleixner posted an alleged fix to the CID issue here: > >=20 > > https://lore.kernel.org/lkml/20260129210219.452851594@kernel.org/ > >=20 > > Please let him know whether or not it helps. >=20 > Good to see this fix candidate series, thanks :) I have set up the patche= s and > started my regular test runs. So far, the hangs have been observed once o= r twice > a week. To confirm the effect of the fix series, I think two weeks runs w= ill be > required. Once I get the result, will share it on this thread and with Th= omas. Two weeks have passed, and I did not observed the hang! Then I'm confident = that the v1 fix series by Thomas avoided the rcu stall issue in my xfs-zoned tes= t systems. The series is already in v6.19 kernel tag as v2. Great. Thomas, just FYI. I faced mysterious kernel hangs during my regular fstests runs [1]. RCU exp= erts suggested the hangs might be caused by the recent MMCID changes. I tried yo= ur v1 fix patch series "sched/mmcid: Cure mode transition woes", and confirmed it avoids the hangs. Thank you for the fix. The v2 series is already in v6.19 kernel tag, so this report might not be so valuable, but just in case. (And thank you again for the additional quick fix for my blktests failure caused= by one of the patches in the series). [1] https://lore.kernel.org/rcu/aXdO52wh2rqTUi1E@shinmob/=