Date: Thu, 24 Mar 2022 14:12:28 +0100 From: Roger Pau =?utf-8?B?TW9ubsOp?= <roger.pau@citrix.com> To: Ze Dupsys <zedupsys@gmail.com> Cc: <freebsd-xen@freebsd.org>, <buhrow@nfbcal.org> Subject: Re: ZFS + FreeBSD XEN dom0 panic Message-ID: <YjxuPF80Z8z0V58t@Air-de-Roger> In-Reply-To: <Yji8NZePmovLFhk2@Air-de-Roger> References: <Yiocagc4dTc15/Y1@Air-de-Roger> <feb35237-555b-29dc-d2fd-1659b400d683@gmail.com> <Yi8IvnqWUoWBIsLB@Air-de-Roger> <ca88a8c8-3b4e-fbde-18a7-d4e5f61e8b2c@gmail.com> <YjSkIZmV%2Bt8Q3AEn@Air-de-Roger> <b5fc1a74-6a52-e237-4a69-2b3f8d4974bd@gmail.com> <YjheCAFXykUZz/pz@Air-de-Roger> <d1d8f552-15a3-3d4f-1143-2e1cae7904ee@gmail.com> <YjipQwBQ/JTo4S6G@Air-de-Roger> <Yji8NZePmovLFhk2@Air-de-Roger>
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On Mon, Mar 21, 2022 at 06:56:05PM +0100, Roger Pau Monné wrote: > On Mon, Mar 21, 2022 at 05:35:15PM +0100, Roger Pau Monné wrote: > > On Mon, Mar 21, 2022 at 04:07:48PM +0200, Ze Dupsys wrote: > > > On 2022.03.21. 13:14, Roger Pau Monné wrote: > > > > I think the problem is not likely with the xenstore implementation > > > > (ie: xs_talkv) but rather a race with how the FreeBSD kernel detects > > > > and manages addition and removal of devices that hang off xenbus. > > > > > > > > I'm afraid there's too much data below for me to parse it. > > > > > > Understood. Sounds more tricky than i thought. What could i do to make data > > > more useful? > > > > I have another patch for you to try. This will make the system a bit > > chatty, let's see what you get. > > Forgot to mention: when testing the patch attached to the previous > email there's no need to push the system until you get a panic. Just > detecting when you have stale xbbd entries in sysctl would be enough, > or alternatively when you start to see entries in the output of > `xenstore-ls -fp` like: > > /local/domain/0/backend/vbd/XX/XXXXX = "" (n0) > /local/domain/0/backend/vbd/XX/XXXXX/feature-barrier = "1" (n0) > /local/domain/0/backend/vbd/XX/XXXXX/feature-flush-cache = "1" (n0) > /local/domain/0/backend/vbd/XX/XXXXX/max-ring-page-order = "5" (n0) > > Note the lack of a '/local/domain/0/backend/vbd/XX/XXXXX/state' node. > > At that point I would request that you attach the output of > `xenstore-ls -fp` together with the full serial log since the system > booted. > > You might not need a lot of iterations to trigger that state. Hello, Sorry to pester, but do you have any update on this? I'm quite sure there are races with xenbus device attach/detach, and the earlier we can get this sorted out the better. Thanks, Roger.
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