On Thu, Jan 5, 2012 at 7:15 PM, Ted Ts'o <tytso@xxxxxxx> wrote: > On Thu, Jan 05, 2012 at 05:14:28PM +0100, Sander Eikelenboom wrote: >> >> OK spoke too soon, i have been able to trigger it again: >> - copying files from LV to the same LV without the snapshot went OK >> - copying from the RO snapshot of a LV to the same LV gave the error while copying the file again: > > OK. Originally, you said you did this: > > 1) fsck -v -p -f the filesystem > 2) mount the filesystem > 3) Try to copy a file > 4) filesystem will be mounted RO on error (see below) > 5) fsck again, journal will be recovered, no other errors > 6) start at 1) > > Was this with with a read-only snapshot always being in existence > through all of these five steps? When was the RO snapshot created? > > If a RO snapshot has to be there in order for this to happen, then > this is almost certainly a device-mapper regression. (dm-devel folks, > this is a problem which apparently occurred when the user went from > v3.1.5 to v3.2, so this looks likes 3.2 regression.) > If it can help, I add the exactly same behaviour: filesystem remounted read-only with the same messages in dmesg and had to fsck it with a 3.1 kernel when I resized my ext4/lvm root fs. I used kernel 3.3-rc6 from debian experimental amd64. root fs remounted read-only with the same errors in dmesg after: lvresize -L +5G /dev/mapper/perceval_vg1-root resize2fs /dev/mapper/perceval_vg1-root Rebooting on 3.3 or 3.2 kernel doesn't helped. Also tried to boot on 3.0 and 2.6.x from rescue CDs without success (fsck ok, mounting without problem but fs remounted ro as soon as I boot on 3.2 or 3.3 kernel). I had to install a 3.1 kernel boot on it to be able to finaly reboot on 3.3. I use a single harddrive without any sort of raid and with one lvm pv and one vg: sudo fdisk -l /dev/sda Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xb0000000 Device Boot Start End Blocks Id System /dev/sda1 63 273104 136521 de Dell Utility /dev/sda2 205073105 205265884 96390 83 Linux /dev/sda3 * 273105 205073104 102400000 7 HPFS/NTFS/exFAT /dev/sda4 205265885 976773167 385753641+ 8e Linux LVM Partition table entries are not in disk order sudo pvs PV VG Fmt Attr PSize PFree /dev/sda4 perceval_vg1 lvm2 a-- 367,88g 187,35g sudo vgs VG #PV #LV #SN Attr VSize VFree perceval_vg1 1 3 0 wz--n- 367,88g 187,35g sudo lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert home perceval_vg1 -wi-ao 151,75g root perceval_vg1 -wi-ao 24,97g swap perceval_vg1 -wi-ao 3,82g Can post other informations if it can help -- Landry MINOZA landry.minoza@xxxxxxxxx -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
