From: Matthew Wilcox <willy@infradead.org>
To: Dexuan Cui <decui@microsoft.com>
Cc: 'Wei Liu' <wei.liu@kernel.org>, vkuznets <vkuznets@redhat.com>,
'Vineeth Pillai' <viremana@linux.microsoft.com>,
"'dri-devel@lists.freedesktop.org'"
<dri-devel@lists.freedesktop.org>,
"'linux-hyperv@vger.kernel.org'" <linux-hyperv@vger.kernel.org>,
"'linux-fbdev@vger.kernel.org'" <linux-fbdev@vger.kernel.org>,
"'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>,
Michael Kelley <mikelley@microsoft.com>
Subject: Re: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver
Date: Fri, 4 Jun 2021 19:52:54 +0100 [thread overview]
Message-ID: <YLp2hulQpBl7JRSO@casper.infradead.org> (raw)
In-Reply-To: <BYAPR21MB1270A0B5CEDBA1C0D2E290EBBF3B9@BYAPR21MB1270.namprd21.prod.outlook.com>
On Fri, Jun 04, 2021 at 06:37:49PM +0000, Dexuan Cui wrote:
> > From: Dexuan Cui
> > Sent: Friday, June 4, 2021 11:17 AM
> > > >> ...
> > > > I've heard a similar report from Vineeth but we didn't get to the bottom
> > > > of this.
> > > I have just tried reverting the commit mentioned above and it solves the
> > > GUI freeze
> > > I was also seeing. Previously, login screen was just freezing, but VM
> > > was accessible
> > > through ssh. With the above commit reverted, I can login to Gnome.
> > >
> > > Looks like I am also experiencing the same bug mentioned here.
> > >
> > > Thanks,
> > > Vineeth
> >
> > As Matthew mentioned, this is a known issue:
> > https://lwn.net/ml/linux-kernel/YLZEhv0cpZp8uVE3@casper.infradead.org/
> >
> > Matthew has reverted ccf953d8f3d6:
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=
> > 0b78f8bcf4951af30b0ae83ea4fad27d641ab617
> > so the latest mainline should work now.
> >
> > Thanks,
> > Dexuan
>
> Hi Matthew,
> With today's latest mainline 16f0596fc1d78a1f3ae4628cff962bb297dc908c,
> the Xorg works again in Linux VM on Hyper-V, but when I reboot the VM, I
> always see a lot of "BUG: Bad page state in process Xorg " warnings (there
> are about 60 such warnings) before the VM reboots.
>
> BTW, I happen to have an older Mar-28 mainline kernel (36a14638f7c0654),
> which has the same warnings.
>
> Any idea which change introduced the warnings?
Looks like someone forgot to call fb_deferred_io_cleanup()?
next prev parent reply other threads:[~2021-06-04 18:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-04 12:25 [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver Vitaly Kuznetsov
2021-06-04 13:00 ` Wei Liu
2021-06-04 15:47 ` Vineeth Pillai
2021-06-04 18:16 ` Dexuan Cui
2021-06-04 18:37 ` Dexuan Cui
2021-06-04 18:52 ` Matthew Wilcox [this message]
2021-06-04 13:31 ` Matthew Wilcox
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