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


From: Alexandre DERUMIER
Subject: Re: [Qemu-devel] [pve-devel] QEMU LIve Migration - swap_free: Bad swap file entry
Date: Thu, 06 Feb 2014 12:14:33 +0100 (CET)

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" <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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