Thierry Vignaud wrote: > Eric Sandeen <sandeen@xxxxxxxxxx> writes: > >>>> However, the system seems to mostly work, so I recreated the ext4 device, >>>> I've just run my backup script again and fsck'd the device. It seems the >>>> problem is reproducible with the new kernel: >>>> >>>> [root@xback2 ~]# fsck /dev/md0 >>>> fsck 1.41.4 (27-Jan-2009) >>>> e2fsck 1.41.4 (27-Jan-2009) >>>> fsck.ext4: Group descriptors look bad... trying backup blocks... >>>> Group descriptor 0 checksum is invalid. Fix<y>? >>>> >>>> Looks like there's a real problem in ext4 causing this under certain >>>> circumstances (unless an obscure hardware error is somehow giving the same >>>> problem). >>>> >>>> To cause this, all I did was rsync a set of directories to the disk. No hard >>>> link trees were created. >>> For the record, I reproduced this bug with 2.6.30-rc2-git6 on a new >>> 1.5Tb disk. Formated as ext4, using relatime, copied 20Gb. >>> On reboot, I got such errors. >>> The hd was partitionned (all ext4) as: >>> / (5Gb) | /usr (20Gb) | /pub (1.5Tb) >>> >>> The smaller system fses didn't saw those errors. >> Can you provide a little more info on how you copied the 20Gb, and >> exactly what the errors were? > > I just copied some files from an USB hard disc with cp on the big > partition (the one that showed the issues). > For other system partitions (that showed _no_ problems) were filled with > something like "rsync -rvltpx / /where/it/was/mounted" > > Here's the fsck log: > > >----------------------------------------------------------------------- Wow, awful. Could you send me dumpe2fs -h output of the large target device, as well as an "e2image -r" image of the source filesystem? That way I can hopefully perfectly replicate your target filesystem as well as the data you're using to populate it, try the cp myself, and see if I hit the same thing. e2image only sends metadata information, not data. If you are concerned about filenames, use -s to scramble them, though this *might* impact my ability to reproduce it... Thanks, -Eric -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
