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From: Christian Borntraeger <borntraeger@de•ibm.com>
To: "Michael S. Tsirkin" <mst@redhat•com>
Cc: "virtualization@lists•linux-foundation.org" 
	<virtualization@lists•linux-foundation.org>,
	Stephen Rothwell <sfr@canb•auug.org.au>,
	Linux Next Mailing List <linux-next@vger•kernel.org>,
	"linux-kernel@vger•kernel.org" <linux-kernel@vger•kernel.org>,
	kvm list <kvm@vger•kernel.org>, Halil Pasic <pasic@linux•ibm.com>
Subject: Re: vhost changes (batched) in linux-next after 12/13 trigger random crashes in KVM guests after reboot
Date: Tue, 7 Jan 2020 12:34:50 +0100	[thread overview]
Message-ID: <c6795e53-d12c-0709-c2e9-e35d9af1f693@de.ibm.com> (raw)
In-Reply-To: <20200107042401-mutt-send-email-mst@kernel.org>



On 07.01.20 10:39, Michael S. Tsirkin wrote:
> On Tue, Jan 07, 2020 at 09:59:16AM +0100, Christian Borntraeger wrote:
>>
>>
>> On 06.01.20 11:50, Michael S. Tsirkin wrote:
>>> On Wed, Dec 18, 2019 at 04:59:02PM +0100, Christian Borntraeger wrote:
>>>> On 18.12.19 16:10, Michael S. Tsirkin wrote:
>>>>> On Wed, Dec 18, 2019 at 03:43:43PM +0100, Christian Borntraeger wrote:
>>>>>> Michael,
>>>>>>
>>>>>> with 
>>>>>> commit db7286b100b503ef80612884453bed53d74c9a16 (refs/bisect/skip-db7286b100b503ef80612884453bed53d74c9a16)
>>>>>>     vhost: use batched version by default
>>>>>> plus
>>>>>> commit 6bd262d5eafcdf8cdfae491e2e748e4e434dcda6 (HEAD, refs/bisect/bad)
>>>>>>     Revert "vhost/net: add an option to test new code"
>>>>>> to make things compile (your next tree is not easily bisectable, can you fix that as well?).
>>>>>
>>>>> I'll try.
>>>>>
>>>>>>
>>>>>> I get random crashes in my s390 KVM guests after reboot.
>>>>>> Reverting both patches together with commit decd9b8 "vhost: use vhost_desc instead of vhost_log" to
>>>>>> make it compile again) on top of linux-next-1218 makes the problem go away.
>>>>>>
>>>>>> Looks like the batched version is not yet ready for prime time. Can you drop these patches until
>>>>>> we have fixed the issues?
>>>>>>
>>>>>> Christian
>>>>>>
>>>>>
>>>>> Will do, thanks for letting me know.
>>>>
>>>> I have confirmed with the initial reporter (internal test team) that <driver name='qemu'/> 
>>>> with a known to be broken linux next kernel also fixes the problem, so it is really the
>>>> vhost changes.
>>>
>>> OK I'm back and trying to make it more bisectable.
>>>
>>> I pushed a new tag "batch-v2".
>>> It's same code but with this bisect should get more information.
>>
>> I get the following with this tag
>>
>> drivers/vhost/net.c: In function ‘vhost_net_tx_get_vq_desc’:
>> drivers/vhost/net.c:574:7: error: implicit declaration of function ‘vhost_get_vq_desc_batch’; did you mean ‘vhost_get_vq_desc’? [-Werror=implicit-function-declaration]
>>   574 |   r = vhost_get_vq_desc_batch(tvq, tvq->iov, ARRAY_SIZE(tvq->iov),
>>       |       ^~~~~~~~~~~~~~~~~~~~~~~
>>       |       vhost_get_vq_desc
>>
> 
> Not sure why but I pushed a wrong commit. Sorry. Should be good now.
> 

during bisect:

drivers/vhost/vhost.c: In function ‘vhost_get_vq_desc_batch’:
drivers/vhost/vhost.c:2634:8: error: ‘id’ undeclared (first use in this function); did you mean ‘i’?
 2634 |  ret = id;
      |        ^~
      |        i

I changed that to i


The last step then gave me  (on commit 50297a8480b439efc5f3f23088cb2d90b799acef vhost: use batched version by default)
net enc1: Unexpected TXQ (0) queue failure: -5
in the guest.

bisect log so far:
[cborntra@m83lp52 linux]$ git bisect log
git bisect start
# bad: [3131e79bb9e9892a5a6bd33513de9bc90b20e867] vhost: use vhost_desc instead of vhost_log
git bisect bad 3131e79bb9e9892a5a6bd33513de9bc90b20e867
# good: [d1281e3a562ec6a08f944a876481dd043ba739b9] virtio-blk: remove VIRTIO_BLK_F_SCSI support
git bisect good d1281e3a562ec6a08f944a876481dd043ba739b9
# good: [5b00aab5b6332a67e32dace1dcd3a198ab94ed56] vhost: option to fetch descriptors through an independent struct
git bisect good 5b00aab5b6332a67e32dace1dcd3a198ab94ed56
# good: [5b00aab5b6332a67e32dace1dcd3a198ab94ed56] vhost: option to fetch descriptors through an independent struct
git bisect good 5b00aab5b6332a67e32dace1dcd3a198ab94ed56
# bad: [1414d7ee3d10d2ec2bc4ee652d1d90ec91da1c79] vhost: batching fetches
git bisect bad 1414d7ee3d10d2ec2bc4ee652d1d90ec91da1c79





  reply	other threads:[~2020-01-07 11:35 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-18 14:43 vhost changes (batched) in linux-next after 12/13 trigger random crashes in KVM guests after reboot Christian Borntraeger
2019-12-18 15:10 ` Michael S. Tsirkin
2019-12-18 15:59   ` Christian Borntraeger
2020-01-06 10:50     ` Michael S. Tsirkin
2020-01-07  8:59       ` Christian Borntraeger
2020-01-07  9:39         ` Michael S. Tsirkin
2020-01-07 11:34           ` Christian Borntraeger [this message]
2020-01-07 11:47             ` Michael S. Tsirkin
2020-01-07 11:55             ` Michael S. Tsirkin
2020-01-07 12:16               ` Christian Borntraeger
2020-01-20  6:27                 ` Michael S. Tsirkin
2020-01-22 19:32                   ` Christian Borntraeger
2020-02-06 14:22                     ` eperezma
2020-02-06 15:12                       ` Christian Borntraeger
2020-02-06 22:17                         ` Michael S. Tsirkin
2020-02-07  7:47                           ` Christian Borntraeger
2020-02-07  7:58                             ` Michael S. Tsirkin
2020-02-07  8:13                               ` Christian Borntraeger
2020-02-07  8:53                                 ` Cornelia Huck
2020-02-07 10:07                                   ` Michael S. Tsirkin
     [not found]                                 ` <CAJaqyWfngzP4d01B6+Sqt8FXN6jX7kGegjx8ie4no_1Er3igQA@mail.gmail.com>
2020-02-10 10:09                                   ` Christian Borntraeger
2020-02-10 11:01                                   ` Christian Borntraeger
2020-02-11  9:33                                     ` Eugenio Pérez
2020-02-11  9:56                                       ` Christian Borntraeger
2020-02-11 10:07                                         ` Christian Borntraeger
2020-02-11 13:04                                     ` Eugenio Pérez
2020-02-11 13:13                                       ` Christian Borntraeger
2020-02-12 16:34                                         ` Eugenio Pérez
2020-02-13  9:30                                           ` Christian Borntraeger
2020-02-13 10:47                                             ` Eugenio Pérez
2020-02-13 13:09                                               ` Christian Borntraeger
2020-02-13 16:29                                                 ` Eugenio Pérez
2020-02-13 16:32                                                   ` Christian Borntraeger
2020-02-14  7:06                                                     ` Eugenio Pérez
2020-02-14  7:33                                                       ` Christian Borntraeger
2020-02-14  7:40                                                         ` Eugenio Perez Martin
2020-02-14  7:43                                                           ` Christian Borntraeger
2020-02-14  7:47                                                             ` Christian Borntraeger
2020-02-14 12:17                                                               ` Eugenio Pérez
2020-02-14 12:22                                                                 ` Christian Borntraeger
2020-02-14 12:26                                                                   ` Eugenio Pérez
2020-02-14 12:34                                                                     ` Christian Borntraeger
2020-03-27 11:08                                                                       ` Eugenio Pérez
2020-03-27 15:46                                                                         ` Christian Borntraeger
2020-02-11 13:57                                       ` Michael S. Tsirkin
2020-03-27  8:03                                         ` Eugenio Perez Martin
2020-02-06 22:07                       ` Michael S. Tsirkin

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