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Fri, 21 May 2021 05:00:29 +0000 From: "Verma, Vishal L" To: "kbusch@kernel.org" , "linux-nvme@lists.infradead.org" CC: "hch@lst.de" , "Williams, Dan J" , "Schofield, Alison" , "linux-kernel@vger.kernel.org" , "Weiny, Ira" , "Widawsky, Ben" Subject: [BISECTED] nvme probe failure with v5.13-rc1 Thread-Topic: [BISECTED] nvme probe failure with v5.13-rc1 Thread-Index: AQHXTf44RymihtVr+UGY7aRawigtfA== Date: Fri, 21 May 2021 05:00:29 +0000 Message-ID: <40071b11108987556d0473f9d968fe7dcd3f304a.camel@intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Evolution 3.40.1 (3.40.1-1.fc34) authentication-results: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=intel.com; x-originating-ip: [134.134.139.74] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: e6f54fdc-56ea-444a-ad6c-08d91c155b13 x-ms-traffictypediagnostic: BYAPR11MB2534: x-ld-processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr,ExtFwd x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:3044; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Hi, I ran into this failure to probe an nvme device in an emulator (simics). It looks like there is a ~60 second wait followed by a timeout and a failure to boot (the root device is an nvme disk) with these messages in the log: [ 67.174010] nvme nvme0: I/O 5 QID 0 timeout, disable controller [ 67.175793] nvme nvme0: Removing after probe failure status: -4 I bisected this to: 5befc7c26e5a ("nvme: implement non-mdts command limits") It's not immediately obvious to me what's causing the problem. Reverting the above commit fixes it. It is easily reproducible - I'd be happy to provide more info about the emulated device or test out patches or theories. It is of course possible that the emulated device is behaving in some non spec-compliant way, in which case I'd appreciate any help figuring out what that is. Thanks, -Vishal _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme