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mx.microsoft.com 1; spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.onmicrosoft.com; s=selector2-citrix-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=mv0+3kzokXdmEQ/Fdh+QFho2JUgAqqg1nHlzm3hkPWg=; b=CXkFR0ecy7SaYsZK6qEyaUpDzD4SsbzWImFh7waGeunNugk7vfytLNiIiTuPhbacYoNLElbR+Lm4Kz484OS8Mqf4C5YjWRtDF7gsYS7KkNpl5zu1Su1rFM4yAl455X9dTjh/uRNiLPxn0tChGh6CXWfvxyBSddI922F2Maz0F/Q= Date: Mon, 20 Dec 2021 14:51:59 +0100 From: Roger Pau =?utf-8?B?TW9ubsOp?= To: G.R. CC: xen-devel Subject: Re: Possible bug? 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disabling device > [ 501.841076] xenbr0: port 2(vif1.0) entered disabled state > Once this error happens, the DOM-U behind this vif is no-longer > accessible. And recreating the same DOM-U does not fix the problem. > Only a reboot on the physical host machine helps. > > The problem showed up after a recent upgrade on the DOM-U OS from > FreeNAS 11.3 to TrueNAS 12.0U7 and breaks the iSCSI service while > leaving other services like NFS intact. > The underlying OS for the NAS is FreeBSD, version 11.3 and 12.2 respectively. > So far I have tried the following combos: > - Linux 4.19 DOM0 + XEN 4.8 + FreeBSD 11.3 DOM-U: Good > - Linux 4.19 DOM0 + XEN 4.8 + FreeBSD 12.2 DOM-U: Regressed > - Linux 5.10 DOM0 + XEN 4.8 + FreeBSD 12.2 DOM-U: Regressed > - Linux 5.10 DOM0 + XEN 4.11 + FreeBSD 12.2 DOM-U: Regressed > > I plan to try out the XEN 4.14 version which is the latest I can get > from the distro (Debian). > If that still does not fix the problem, I would build the 4.16 version > from source as my last resort. > > I have to admit that this trial process is blind as I have no idea > which component in the combo is to be blamed. Is it a bug in the > backend-driver, frontend-driver or the hypervisor itself? Or due to > incompatible versions? Any suggestion on other diagnose ideas (e.g. > debug logs) will be welcome, while I work on the planned experiments. This is a bug in FreeBSD netfront, so no matter which Linux or Xen version you use. Does it make a difference if you disable TSO and LRO from netfront? $ ifconfig xn0 -tso -lro Do you have instructions I can follow in order to try to reproduce the issue? Thanks, Roger.