[dm-devel] Kernel error at a LVM snapshot creation

[Zdenek Kabelac]

Dne 02. 09. 19 v 15:58 Dmitrij Gusev napsal(a):
> Hello.
> 
> Please find answers below.
> Thank you.
> Dmitrij
> 
> On 2019-09-02 11:32, Zdenek Kabelac wrote:
>> Dne 02. 09. 19 v 3:04 Dmitrij Gusev napsal(a):
>>> Hello.
>>>
>>> I get a kernel error every time I create LVM snapshot - at the creation and 
>>> at boot time, though the snapshot itself is working properly.
>>>
>>> Linux nexus 4.19.69 #2 SMP Thu Aug 29 16:33:35 CDT 2019 x86_64 Intel(R) 
>>> Xeon(R) E-2174G CPU @ 3.80GHz GenuineIntel GNU/Linux
>>
>> Hi
>>
>>
>> This is likely not a kernel error.
>>
>> In which way are you creating your snapshot ?
>> Seems like it's made read-only ?
> 
> Yes, I create read-only snapshot in this case.
> 
> cmd line: lvcreate -pr --size $size --snapshot -n $snap $lv $pv
> 
>>
>> What version of lvm2 are you using ?
>> (there used to be bug when creating COW as read-only device)
> 
> I use lvm2 format.
> 
> LVM utility version: lvm2-2.02.154 (Slackware 14.2).
> 


Yep - so please try to use lvm2 version >= 2.02.178
(contains fix for COW to be read-write even for read-only snapshots)


Regards

Zdenek