Re: [Xen-devel] Xen 3.4.2 kernel / lvcreate crash

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Apr 01, 2010 at 10:33:57AM +0300, Valtteri Kiviniemi wrote:
> Hi,
>
> I am not using Debian Xen kernel, I have always downloaded the latest  
> release from xen.org and compiled it myself.
>

You might want to take a look at the RHEL5 kernel-xen 2.6.18 sources/patches,
I think their kernel has stable snapshots.

And yeah, RHEL5 kernel has huge amount of patches, so it might take
some time to go through all of them and figure out which ones are relevant..

-- Pasi

> - Valtteri
>
> Jeremy Fitzhardinge kirjoitti:
>> On 03/31/2010 05:34 PM, Valtteri Kiviniemi wrote:
>>> I am using Xen 3.4.2 with kernel 2.6.18.8 and Debian Lenny. I am having
>>> some problems with LVM-snapshots. I have crontab which makes once a
>>> night a snapshot from domU's LV.
>>>
>>> The problem is that maybe once in a month the lvcreate command stucks
>>> and after that I have to reboot the machine to solve the problem.
>>>
>>> So is this a problem on the Xen kernel or with Debian?
>>
>> Someone reported a very similar crash with a Debian Xen kernel.  I 
>> would suspect a bug in the Debian Xen kernel.
>>
>>     J
>>
>>>
>>> dmesg shows the following:
>>>
>>> Unable to handle kernel NULL pointer dereference at 0000000000000030 RIP:
>>>  [<ffffffff804218a2>] __map_bio+0x45/0x9b
>>> PGD 38057067 PUD 10657067 PMD 0
>>> Oops: 0000 [1] SMP
>>> CPU 0
>>> Pid: 17350, comm: lvcreate Not tainted 2.6.18.8-dom0 #1
>>> RIP: e030:[<ffffffff804218a2>]  [<ffffffff804218a2>] __map_bio+0x45/0x9b
>>> RSP: e02b:ffff880028693d68  EFLAGS: 00010202
>>> RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000001
>>> RDX: ffff8800311bfaf0 RSI: ffff8800219c38c0 RDI: ffffc200000f30d8
>>> RBP: ffff8800311bfae0 R08: 0000000000000001 R09: 001322b628693ce8
>>> R10: 0000000000000001 R11: 00000000006cc4a0 R12: ffff8800219c38c0
>>> R13: fffffffff3800008 R14: ffff88003c56c5d8 R15: ffff8800311bfae0
>>> FS:  00002b35f3f7ac20(0000) GS:ffffffff805ca000(0000)  
>>> knlGS:0000000000000000
>>> CS:  e033 DS: 0000 ES: 0000
>>> Process lvcreate (pid: 17350, threadinfo ffff880028692000, task
>>> ffff88003cc510c0)
>>> Stack:  ffff88003f5a0440 0000000000000001 ffff88003c56c5c0  
>>> ffff88003c565400
>>>  fffffffff3800008 ffffffff804221b5 ffff88003c56c5d8 ffff88003f5a0440
>>>  ffff88003c56c5c0 ffff88003c565400 ffff8800252b1f10 ffffffff8025e099
>>> Call Trace:
>>>  [<ffffffff804221b5>] __split_bio+0x1a9/0x3f7
>>>  [<ffffffff8025e099>] __down_write_nested+0x12/0xf1
>>>  [<ffffffff8022fe0e>] __up_write+0x1d/0x115
>>>  [<ffffffff804225b9>] dm_resume+0xa1/0x137
>>>  [<ffffffff80425158>] dev_suspend+0x0/0x171
>>>  [<ffffffff804252a3>] dev_suspend+0x14b/0x171
>>>  [<ffffffff80425bb6>] ctl_ioctl+0x1c6/0x20e
>>>  [<ffffffff8024012a>] do_ioctl+0x56/0x6c
>>>  [<ffffffff8022fddb>] vfs_ioctl+0x23a/0x250
>>>  [<ffffffff8024a42f>] sys_ioctl+0x3d/0x5c
>>>  [<ffffffff8025a21c>] system_call+0x68/0x6d
>>>  [<ffffffff8025a1b4>] system_call+0x0/0x6d
>>>
>>>
>>> Code: ff 50 30 41 89 c5 83 f8 00 7e 10 4c 89 e7 41 59 5b 5d 41 5c
>>> RIP  [<ffffffff804218a2>] __map_bio+0x45/0x9b
>>>  RSP <ffff880028693d68>
>>> CR2: 0000000000000030
>>>
>>>
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>>> http://lists.xensource.com/xen-devel
>>>
>>
>>
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>
>
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