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[dm-devel] dm-cache refusing to come up again after a crash

Linux (3.12.0-rc5) hung, and on boot, I can't get the dm-cache up again:

(initramfs) echo 0 23440891904 cache /dev/cache/metadata /dev/cache/blocks /dev/md1 1024 1 writeback
default 4 random_threshold 8 sequential_threshold 512 | dmsetup create cache -u CACHE-0a8bb56fc873c195bf7117af925c7f08
device-mapper: reload ioctl on cache failed: Input/output error
Command failed

The kernel complains with

[  639.189756] attempt to access beyond end of device
[  639.189761] dm-0: rw=0, want=18445688752888627208, limit=1048576
[  639.189764] device-mapper: transaction manager: couldn't open metadata space map
[  639.189767] device-mapper: cache metadata: tm_open_with_sm failed
[  639.283130] device-mapper: table: 254:2: cache: Error creating metadata object
[  639.283134] device-mapper: ioctl: error adding target to table

Is there anything I can do short of nuking the metadata partition
and taking the loss of whatever wasn't written back?

/* Steinar */
Homepage: http://www.sesse.net/

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