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

[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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