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

[Stefan Priebe - Profihost AG]

some more things which happen during migration:

php5.2[20258]: segfault at a0 ip 0000000000740656 sp 00007fff53b694a0
error 4 in php-cgi[400000+6d7000]

php5.2[20249]: segfault at c ip 00007f1fb8ecb2b8 sp 00007fff642d9c20
error 4 in ZendOptimizer.so[7f1fb8e71000+147000]

cron[3154]: segfault at 7f0008a70ed4 ip 00007fc890b9d440 sp
00007fff08a6f9b0 error 4 in libc-2.13.so[7fc890b67000+182000]

Stefan

Am 06.02.2014 13:10, schrieb 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" <s.priebe at profihost.ag> 
>> À: "Alexandre DERUMIER" <aderumier at odiso.com> 
>> Cc: pve-devel at pve.proxmox.com, "qemu-devel" <qemu-devel at nongnu.org> 
>> 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" <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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