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mx.microsoft.com 1; spf=pass smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass header.d=arm.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=cA+dwOzGZZMSncEvtsR8v1wR30ZJazGZNB8d4LHiXYU=; b=RVefpZ38ysph/ZjoZ/MBHZX9KzWaJOk+F0/I6Ulnwi+StZIyqlRlZP9Y+V96A+5X0y99NSyTsdahQ6O8+hYlpgpn4RbKcLTSN76yGQzApQF99HgvfpaMKbRVlOPtPi2ScxXCe6tI25Nm3xCqoCLzofYflaO9Ua7KM9ocK/udlF8= Authentication-Results-Original: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=arm.com; Content-Type: text/plain; charset=utf-8 Subject: Re: xen/evtchn: Dom0 boot hangs using preempt_rt kernel 5.10 From: Luca Fancellu In-Reply-To: Date: Tue, 23 Mar 2021 15:39:07 +0000 Cc: "xen-devel@lists.xenproject.org" Content-Transfer-Encoding: quoted-printable Message-Id: <565C6475-4693-4A7C-8316-9613146300C2@arm.com> References: <1FAD6C91-2B3A-48F0-88D7-CFCFC8B53BA9@arm.com> <2BC82A95-DFB9-4F90-8CC6-AE39405157ED@arm.com> To: Jason Andryuk X-Mailer: Apple Mail (2.3654.60.0.2.21) X-Originating-IP: [82.8.129.65] X-ClientProxiedBy: LO2P265CA0007.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:62::19) To VI1PR08MB3629.eurprd08.prod.outlook.com (2603:10a6:803:7f::25) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 5db10e64-9f4b-4c90-cfcf-08d8ee11d50c X-MS-TrafficTypeDiagnostic: VE1PR08MB5247:|AM0PR08MB4211: X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true NoDisclaimer: true X-MS-Oob-TLC-OOBClassifiers: OLM:10000;OLM:10000; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Mar 2021 15:39:22.8612 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5db10e64-9f4b-4c90-cfcf-08d8ee11d50c X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM5EUR03FT005.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR08MB4211 Hi Jason, Thanks for your hints, unfortunately seems not an init problem because in t= he same init configuration I tried the 5.10.23 (preempt_rt) without the Jue= rgen patch but with the BUG_ON removed and it boots without problem. So see= ms that applying the serie does something (on a preempt_rt kernel) and we a= re trying to figure out what. > On 23 Mar 2021, at 12:36, Jason Andryuk wrote: >=20 > On Mon, Mar 22, 2021 at 3:09 PM Luca Fancellu wro= te: >>=20 >> Hi Juergen, >>=20 >> Yes you are right it was my mistake, as you said to remove the BUG_ON(= =E2=80=A6) this serie (https://patchwork.kernel.org/project/xen-devel/cover= /20210306161833.4552-1-jgross@suse.com/) is needed, since I=E2=80=99m using= yocto I=E2=80=99m able to build a preempt_rt kernel up to the 5.10.23 and = for this reason I=E2=80=99m applying that serie on top of this version, the= n I=E2=80=99m removing the BUG_ON(=E2=80=A6). >>=20 >> A thing that was not expected is that now the Dom0 kernel is stuck on = =E2=80=9CSetting domain 0 name, domid and JSON config=E2=80=A6=E2=80=9D ste= p and the system seems unresponsive. Seems like a deadlock issue but lookin= g into the serie we can=E2=80=99t spot anything and that serie was also tes= ted by others from the community. >> Do you have any idea on that? >=20 > I think this can happen if xenstored isn't running. Client access to > xenstore blocks until xenstored becomes available. So check your init > scripts ordering. >=20 > Regards, > Jason Cheers, Luca=