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

[Alexandre DERUMIER]

Do you force rbd_cache=true in ceph.conf?

if yes, do you use cache=writeback ?

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" <s.priebe at profihost.ag> 
À: pve-devel at pve.proxmox.com, "qemu-devel" <qemu-devel at nongnu.org> 
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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