On Thu, 5 Jan 2012, Ted Ts'o 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, The existence of a snapshot changes I/O completion times significantly, so it may be a race condition in ext4 that gets triggered which changed timings. Mikulas > 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.) > > - Ted -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
