[CentOS-virt] Crash in CentOS 7 kernel-3.10.0-514.16.1.el7.x86_64 in Xen PV mode

Tue Oct 24 21:09:32 UTC 2017
Akemi Yagi <amyagi at gmail.com>

On Tue, Oct 24, 2017 at 12:53 PM, Karl Johnson <karljohnson.it at gmail.com>
wrote:

> On Tue, Oct 24, 2017 at 3:09 PM, Karl Johnson <karljohnson.it at gmail.com>
> wrote:
>
>> On Tue, Oct 24, 2017 at 3:36 AM, Akemi Yagi <amyagi at gmail.com> wrote:
>>
>>> On Mon, Oct 23, 2017 at 11:08 PM, Akemi Yagi <amyagi at gmail.com> wrote:
>>>
>>>> On Mon, Oct 23, 2017 at 12:57 PM, Karl Johnson <
>>>> karljohnson.it at gmail.com> wrote:
>>>>
>>>>> On Sat, May 20, 2017 at 8:30 PM, Sarah Newman <srn at prgmr.com> wrote:
>>>>>
>>>>>> I experienced a bug that is likely the same as
>>>>>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1350373 . Commit
>>>>>> b7dd0e350e0bd4c0fddcc9b8958342700b00b168 , which is supposed to fix
>>>>>> it, doesn't appear in this kernel and doesn't apply cleanly either.
>>>>>> Is there any point in trying to backport the patch?
>>>>>>
>>>>>> I had the same kernel panic while booting a PV domU on
>>>>> 3.10.0-693.2.2.el7.centos.plus.x86_64. I had to start the domU again
>>>>> to boot correctly. Can this patch be added to the CentOS 7 kernel-plus?
>>>>>
>>>>> Karl
>>>>>
>>>>
>>>> ​I can certainly add the patch (commit b7dd0e350e0bd4c0fddcc9b8958342700b00b168)
>>>> to the Plus kernel.​ It would be best if you could file a request on
>>>> http://bugs.centos.org so that we can track it better.
>>>>
>>>> Akemi
>>>>
>>>
>>> ​A CentOSPlus kernel ​set with the referenced patch applied is available
>>> for testing at:
>>>
>>> https://people.centos.org/toracat/kernel/7/plus/xen/
>>>
>>> Feedback appreciated,
>>>
>>> Akemi
>>>
>>
>> Thanks for the build Akemi. I will try to test this kernel in the next
>> days however it will be hard to know if it fix the kernel panic because I
>> can't reproduce it. It's seems to be random and pretty rare in my case.
>>
>
> The test kernel doesn't boot on my side:
>
> [    0.077000] Call Trace:
> [    0.077000]  [<ffffffff813f6e70>] ? gnttab_init+0x260/0x260
> [    0.077000]  [<ffffffff813f6e93>] __gnttab_init+0x23/0x40
> [    0.077000]  [<ffffffff810020e8>] do_one_initcall+0xb8/0x230
> [    0.077000]  [<ffffffff81b5d1fb>] kernel_init_freeable+0x17a/0x219
> [    0.077000]  [<ffffffff81b5c9d4>] ? initcall_blacklist+0xb0/0xb0
> [    0.077000]  [<ffffffff816a3d20>] ? rest_init+0x80/0x80
> [    0.077000]  [<ffffffff816a3d2e>] kernel_init+0xe/0xf0
> [    0.077000]  [<ffffffff816c5f98>] ret_from_fork+0x58/0x90
> [    0.077000]  [<ffffffff816a3d20>] ? rest_init+0x80/0x80
> [    0.077000] Code: 00 00 66 2e 0f 1f 84 00 00 00 00 00 83 c3 01 41 39 dd
> 0f 86 84 00 00 00 4c 63 e3 31 f6 bf d0 00 00 00 4e 8d 34 e0 e8 01 09 d9 ff
> <49> 89 06 48 8b 05 37 0d bf 00 4a 83 3c e0 00 75 d0 48 89 c7 41
> [    0.077000] RIP  [<ffffffff813f6d0f>] gnttab_init+0xff/0x260
> [    0.077000]  RSP <ffff88003daa3df8>
> [    0.077000] CR2: 0000000000000010
> [    0.077000] ---[ end trace ad7a936cdeb5166e ]---
> [    0.077000] Kernel panic - not syncing: Fatal exception
>
> I switched back to 3.10.0-693.2.2.el7.centos.plus.x86_64.
>

​Looks as if the patch broke something before it could fix the problem...

Akemi​
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