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Date: Fri, 6 Jan 2012 11:40:17 -0500 (EST) From: Mikulas Patocka <mpatocka@...hat.com> To: device-mapper development <dm-devel@...hat.com> cc: Sander Eikelenboom <linux@...elenboom.it>, linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [dm-devel] can't recover ext4 on lvm from ext4_mb_generate_buddy:739: group 1687, 32254 clusters in bitmap, 32258 in gd 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 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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