[Dump-users] dump : numerous lines stating : 'bread: lseek fails '

[gnafou <fmg...@ya...>]

Hello


We are having some problems with dump :

dump outputs numerous '  DUMP: bread: lseek fails  ' 

We have been unable to figure why some dump work properly and why some  output the previous message ( hundred of times ) .


Context : 
debian squeeze
i386
e2fsprogs 1.41.12-4stable1
libc6 2.11.3-4
We have LVM ext3 filesystems  mounted on  '/mnt/repos' 
  on this filesystem we have files which are  kvm raw images 
  these raw images contain a ext3 partition that we want to backup 

process: 
we 'snapshot' the  /mnt/repos   logical volume 
we mount the snapshotted logical volume to access ( frozen)  kvm raw-files 
we access the ext3 filesystem from the kvm raw-files with losetup and kpartx
 we dump the /dev/mapper/loop0p1 device ,  writing the dumpfile to a disk 

I do not really know what to look for  to understand what is causing the  DUMP: bread: lseek fails message

( tested with debian 0.4b43 as well as copiled 0.4b44 ) 



LOG
 DUMP: Date of this level 0 dump: Mon Nov 19 02:51:46 2012
 DUMP: Date of last level ? dump: Fri Nov 16 14:17:00 2012
 DUMP: Dumping /dev/mapper/loop0p1 (an unlisted file system) to /mnt/backup/KVM017-2012.11.19-02.51.dump3
 DUMP: Label: none
 DUMP: Writing 10 Kilobyte records
 DUMP: Compressing output at compression level 2 (bzlib)
 DUMP: mapping (Pass I) [regular files]
 DUMP: mapping (Pass II) [directories]
 DUMP: estimated 275086 blocks.
 DUMP: Volume 1 started with block 1 at: Mon Nov 19 02:51:51 2012
 DUMP: dumping (Pass III) [directories]
 DUMP: dumping (Pass IV) [regular files]

 DUMP: bread: lseek fails
( about 1300 times) 

 DUMP: bread: lseek fails
 DUMP: Closing /mnt/backup/KVM017-2012.11.19-02.51.dump3
 DUMP: Volume 1 completed at: Mon Nov 19 02:52:44 2012
 DUMP: Volume 1 took 0:00:53
 DUMP: Volume 1 transfer rate: 2188 kB/s
 DUMP: Volume 1 276210kB uncompressed, 115991kB compressed, 2.382:1
 DUMP: 276210 blocks (269.74MB) on 1 volume(s)
 DUMP: finished in 53 seconds, throughput 5211 kBytes/sec
 DUMP: Date of this level 0 dump: Mon Nov 19 02:51:46 2012
 DUMP: Date this dump completed:  Mon Nov 19 02:52:44 2012
 DUMP: Average transfer rate: 2188 kB/s
 DUMP: Wrote 276210kB uncompressed, 115991kB compressed, 2.382:1
 DUMP: DUMP IS DONE