Re: [Xen-devel] Xen 4 snapshot problem

[Valtteri Kiviniemi <mailinglists@xxxxxxxxxxxx>]

Hi,

Bump.

Does anyone have any ideas what could be causing this?

- Valtteri Kiviniemi

Valtteri Kiviniemi kirjoitti:
> Hi,
>
> I am having some problems with Xen 4 (2.6.31.13) and lvm-snapshots. I 
> have a snapshot-script running once a night. The snapshots are created 
> succesfully and all the data is accessible. However, some times the 
> snapshot creation gives errors in dmesg, but it still finishes 
> succesfully. I had problems previously on Xen 3.4's 2.6.18.8 kernel 
> where the lvcreate command just stuck. I was instructed to test Xen 4 
> and the latest pv_ops kernel to see if it works better. Is there still 
> some bug related to creating lvm snapshots?
> Server is running latest Xen downloaded from xen.org and manually 
> compiled. Distro is debian lenny.
> Log:
>
> attempt to access beyond end of device
> dm-0: rw=0, want=209715144, limit=41943040
> Buffer I/O error on device dm-0, logical block 26214392
> EXT4-fs (dm-0): barriers enabled
> kjournald2 starting: pid 2572, dev dm-0:8, commit interval 5 seconds
> EXT4-fs (dm-0): internal journal on dm-0:8
> EXT4-fs (dm-0): delayed allocation enabled
> EXT4-fs: file extents enabled
> EXT4-fs: mballoc enabled
> EXT4-fs (dm-0): ext4_orphan_cleanup: deleting unreferenced inode 265279
> EXT4-fs (dm-0): 1 orphan inode deleted
> EXT4-fs (dm-0): recovery complete
> EXT4-fs (dm-0): mounted filesystem with ordered data mode
> mount: page allocation failure. order:5, mode:0xc0d0
> Pid: 3178, comm: mount Not tainted 2.6.31.13-dom0 #1
> Call Trace:
>  [<ffffffff8106b539>] ? __alloc_pages_nodemask+0x507/0x54e
>  [<ffffffff8106b5e9>] ? __get_free_pages+0x12/0x4f
>  [<ffffffff8110562d>] ? ext4_mb_init+0x34c/0x425
>  [<ffffffff810f976c>] ? ext4_fill_super+0x1b4c/0x1fe4
>  [<ffffffff811a5177>] ? snprintf+0x44/0x4c
>  [<ffffffff81391274>] ? __down_write_nested+0x34/0xa9
>  [<ffffffff8100e21f>] ? xen_restore_fl_direct_end+0x0/0x1
>  [<ffffffff8100db7d>] ? xen_force_evtchn_callback+0x9/0xa
>  [<ffffffff8100e232>] ? check_events+0x12/0x20
>  [<ffffffff81090326>] ? get_sb_bdev+0x111/0x159
>  [<ffffffff810f7c20>] ? ext4_fill_super+0x0/0x1fe4
>  [<ffffffff8108f456>] ? vfs_kern_mount+0x4f/0x95
>  [<ffffffff8108f4ef>] ? do_kern_mount+0x43/0xe1
>  [<ffffffff8100e232>] ? check_events+0x12/0x20
>  [<ffffffff810a3415>] ? do_mount+0x716/0x782
>  [<ffffffff810a3506>] ? sys_mount+0x85/0xcf
>  [<ffffffff81011942>] ? system_call_fastpath+0x16/0x1b
> Mem-Info:
> DMA per-cpu:
> CPU    0: hi:    0, btch:   1 usd:   0
> CPU    1: hi:    0, btch:   1 usd:   0
> CPU    2: hi:    0, btch:   1 usd:   0
> CPU    3: hi:    0, btch:   1 usd:   0
> DMA32 per-cpu:
> CPU    0: hi:  186, btch:  31 usd:   0
> CPU    1: hi:  186, btch:  31 usd:   0
> CPU    2: hi:  186, btch:  31 usd:   0
> CPU    3: hi:  186, btch:  31 usd:   0
> Active_anon:12622 active_file:75787 inactive_anon:12687
>  inactive_file:51082 unevictable:5 dirty:7507 writeback:17 unstable:0
>  free:3836 slab:76527 mapped:1129 pagetables:843 bounce:0
> DMA free:4000kB min:52kB low:64kB high:76kB active_anon:0kB 
> inactive_anon:84kB a                                                 
> ctive_file:5440kB inactive_file:2832kB unevictable:0kB present:13756kB 
> pages_sca
>                    nned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 994 994 994
> DMA32 free:11344kB min:4004kB low:5004kB high:6004kB active_anon:50488kB 
> inactiv                                    e_anon:50664kB 
> active_file:297708kB inactive_file:201496kB unevictable:20kB pres
>  ent:1018080kB pages_scanned:0 all_unreclaimable? no
> lowmem_reserve[]: 0 0 0 0
> DMA: 254*4kB 1*8kB 2*16kB 0*32kB 8*64kB 5*128kB 5*256kB 1*512kB 0*1024kB 
> 0*2048k                                    B 0*4096kB = 4000kB
> DMA32: 1510*4kB 149*8kB 217*16kB 10*32kB 1*64kB 2*128kB 0*256kB 0*512kB 
> 0*1024kB                                      0*2048kB 0*4096kB = 11344kB
> 127182 total pagecache pages
> 0 pages in swap cache
> Swap cache stats: add 0, delete 0, find 0/0
> Free swap  = 0kB
> Total swap = 0kB
> 262144 pages RAM
> 23192 pages reserved
> 127122 pages shared
> 111804 pages non-shared
>
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