From: Sitsofe Wheeler <sitsofe@gmail.com>
To: KY Srinivasan <kys@microsoft.com>
Cc: Dexuan Cui <decui@microsoft.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Haiyang Zhang <haiyangz@microsoft.com>,
"devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PANIC, hyperv] BUG: unable to handle kernel paging request at ffff880077800004 (hv_ringbuffer_write)
Date: Wed, 27 Aug 2014 23:57:39 +0100 [thread overview]
Message-ID: <20140827225739.GA24590@sucs.org> (raw)
In-Reply-To: <51ae44fcae424365a6d78f3597175d77@BY2PR0301MB0711.namprd03.prod.outlook.com>
On Wed, Aug 27, 2014 at 06:45:55PM +0000, KY Srinivasan wrote:
>
> > -----Original Message-----
> > From: Sitsofe Wheeler [mailto:sitsofe@gmail.com]
> > Sent: Wednesday, August 27, 2014 9:19 AM
> >
> > > BTW, with the patch below, hyperv_fb can work now, BUT,
> > > *occasionally*,
> > > storvsc_probe() -> ... -> vmbus_open() -> can fail due to
> > > HV_STATUS_INVALID_ALIGNMENT...
> >
> > I applied your new patch on top of KY's pieces (it applied cleanly)
> > and while it doesn't blow up, one warning is printed out and the UP
> > boot seemed to stall after input: TPPS/2 message (but pressing
> > ctrl-alt-delete allows the system to reboot cleanly).
>
> First let me thank you guys for looking into this issue. Looking at
> your dmesg, it looked like storvsc probe failed as Dexuan had seen.
> Since the failure appears to be alignment related, perhaps we could
> test with allocating a page all the time (and getting rid of the
> kmalloc). Sitsofe, here is a patch based on Dexuan's patch. If this
> works, I will probably minimize failure cases by pre-allocating
> per-cpu pages for this.:
After some modifications to apply on top of your previous patches
applying this latest patch has cured the issues surrounding hyperv_fb
issues on boot. The only issue seen on boot now is similar to
https://lkml.org/lkml/2014/8/19/227 ...
How come previous alignment efforts weren't working out?
--
Sitsofe | http://sucs.org/~sits/
next prev parent reply other threads:[~2014-08-27 22:57 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-20 9:26 Sitsofe Wheeler
2014-08-20 11:15 ` Dexuan Cui
2014-08-20 11:40 ` Sitsofe Wheeler
2014-08-20 13:42 ` Dexuan Cui
2014-08-25 14:02 ` Dexuan Cui
2014-08-25 17:41 ` Sitsofe Wheeler
2014-08-26 10:30 ` Dexuan Cui
2014-08-27 10:44 ` Sitsofe Wheeler
2014-08-27 11:30 ` Dexuan Cui
2014-08-27 12:15 ` Sitsofe Wheeler
2014-08-27 14:14 ` Dexuan Cui
2014-08-27 16:19 ` Sitsofe Wheeler
2014-08-27 18:45 ` KY Srinivasan
2014-08-27 22:57 ` Sitsofe Wheeler [this message]
2014-08-27 23:13 ` KY Srinivasan
2014-08-28 3:21 ` Dexuan Cui
2014-08-28 3:41 ` KY Srinivasan
2014-08-28 12:48 ` Sitsofe Wheeler
2014-08-29 3:39 ` Dexuan Cui
2014-08-29 9:49 ` Dan Carpenter
2014-08-29 10:16 ` Dexuan Cui
2014-08-29 10:24 ` Dan Carpenter
2014-08-29 11:20 ` Sitsofe Wheeler
2014-08-29 14:48 ` Dexuan Cui
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