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Thu, 8 Oct 2020 21:58:09 +0000 Received: from BN7PR08MB5668.namprd08.prod.outlook.com ([fe80::9c4e:c26a:ec0a:ce59]) by BN7PR08MB5668.namprd08.prod.outlook.com ([fe80::9c4e:c26a:ec0a:ce59%6]) with mapi id 15.20.3455.023; Thu, 8 Oct 2020 21:58:09 +0000 From: "Leverett, Bruce" To: "freebsd-net@freebsd.org" Subject: kernel: page fault in unp_pcb_owned_lock2_slowpath Thread-Topic: kernel: page fault in unp_pcb_owned_lock2_slowpath Thread-Index: AQHWnb0Xf6rfnSMCqUKqk2XoPtnrow== Date: Thu, 8 Oct 2020 21:58:09 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [65.205.22.243] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: f6cac205-2441-4c81-8b6a-08d86bd53eb7 x-ms-traffictypediagnostic: BN6PR08MB2610: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: RldD4rWGRe0UnrXAXAm16QDRHwqKqQFRLR/f9qgGmuxG8hypwpC4KDwLQHZ59kVMQ3jj8i9enoa2f1mvEdNiEIl7gOmi5oRQN3N8R7T3BLUcBUBM8O41t0QhwTaIYlya3hSIYFPK1sdVsqdwXgpYeC9sm4cokmnwAB/KDhCBbDr87U+NzCqbXv6WfwQJTantx59zH6kaZg3z6HU0Bjh+eohHCGwLhUUnSaKjtjhgru0g43+HWJj9OzTc2BuqdjbuUUPd4MWNntZC5kZgMPaYYmgbfPHApYS4kenmwuzQE8b5C2R6cHQz7EjSLHRHasvN x-forefront-antispam-report: CIP:255.255.255.255; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.33 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Oct 2020 21:58:15 -0000 In 12.1, we are seeing a page fault in unp_pcb_owned_lock2_slowpath, while = trying to lock unp2. Examination of the crash dump shows that unp2's refer= ence count is down to zero, which it shouldn't be, since the function took = a reference on it before unlocking unp. Could this be a bug that has been fixed in recent versions? I would look i= nto upgrading, or back-porting the fix, if a fix is known. Bruce Leverett Panasas, Inc.