Re: [Qemu-devel] [pve-devel] QEMU LIve Migration - swap_free: Bad swap file entry

[Stefan Priebe - Profihost AG]

May be,

sadly i've no idea. Only using 3.10 Kernel with XFS.

Stefan

Am 06.02.2014 12:40, schrieb Alexandre DERUMIER:
>>> PS: all my guests do not even have !!SWAP!! 
> 
> Not sure is related to swap file.
> 
> I found an similar problem here, triggered with suspend/resume on ext4
> 
> http://lkml.indiana.edu/hypermail/linux/kernel/1106.3/01340.html
> 
> 
> Maybe is it a guest kernel bug ?
> 
> ----- Mail original ----- 
> 
> De: "Stefan Priebe - Profihost AG" <address@hidden> 
> À: "Alexandre DERUMIER" <address@hidden> 
> Cc: address@hidden, "qemu-devel" <address@hidden> 
> Envoyé: Jeudi 6 Février 2014 12:19:36 
> Objet: Re: [pve-devel] QEMU LIve Migration - swap_free: Bad swap file entry 
> 
> 
> Am 06.02.2014 12:14, schrieb Alexandre DERUMIER: 
>> Do you force rbd_cache=true in ceph.conf? 
> 
> no 
> 
>> if yes, do you use cache=writeback ? 
> 
> yes 
> 
> So this should be safe. 
> 
> PS: all my guests do not even have !!SWAP!! 
> 
> # free|grep Swap 
> Swap: 0 0 0 
> 
> Stefan 
> 
>> according to ceph doc: 
>> http://ceph.com/docs/next/rbd/qemu-rbd/ 
>>
>> "Important If you set rbd_cache=true, you must set cache=writeback or risk 
>> data loss. Without cache=writeback, QEMU will not send flush requests to 
>> librbd. If QEMU exits uncleanly in this configuration, filesystems on top of 
>> rbd can be corrupted." 
>>
>>
>>
>> ----- Mail original ----- 
>>
>> De: "Stefan Priebe" <address@hidden> 
>> À: address@hidden, "qemu-devel" <address@hidden> 
>> Envoyé: Mercredi 5 Février 2014 18:51:15 
>> Objet: [pve-devel] QEMU LIve Migration - swap_free: Bad swap file entry 
>>
>> Hello, 
>>
>> after live migrating machines with a lot of memory (32GB, 48GB, ...) i 
>> see pretty often crashing services after migration and the guest kernel 
>> prints: 
>>
>> [1707620.031806] swap_free: Bad swap file entry 00377410 
>> [1707620.031806] swap_free: Bad swap file entry 00593c48 
>> [1707620.031807] swap_free: Bad swap file entry 03201430 
>> [1707620.031807] swap_free: Bad swap file entry 01bc5900 
>> [1707620.031807] swap_free: Bad swap file entry 0173ce40 
>> [1707620.031808] swap_free: Bad swap file entry 011c0270 
>> [1707620.031808] swap_free: Bad swap file entry 03c58ae8 
>> [1707660.749059] BUG: Bad rss-counter state mm:ffff88064d09f380 idx:1 
>> val:1536 
>> [1707660.749937] BUG: Bad rss-counter state mm:ffff88064d09f380 idx:2 
>> val:-1536 
>>
>> Qemu is 1.7 
>>
>> Does anybody know a fix? 
>>
>> Greets, 
>> Stefan 
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