Bug#715019: linux-image-3.10-rc7-amd64: Bcache (with cache on LVM?) stops system from shutting down

[Jarno Elonen]

Ok, I tried to take a photo but apparently the camera was set for very
low resolution. :/ Anyway, a few pictures attached, and here's also a
manual transcript of a few lines:

[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
reading dirty data from cache, recovering
[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
reading dirty data from cache, recovering
[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
reading dirty data from cache, recovering
[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
reading dirty data from cache, recovering
[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
reading dirty data from cache, recovering
[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
writing btree, recovering
[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
writing btree, recovering
[242807.xxxxxx] [242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO
error on writing btree, recovering
[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
reading dirty data from cache, recovering
[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
reading dirty data from cache, recovering
[242807.xxxxxx] bcache: bch_count_io_errors() dm-2: IO error on
writing btree, recovering
[242866.xxxxxx] ata5.00: exception Emask 0x0 SAct 0x0 SError 0x0
action 0x6 frozen
[242866.xxxxxx] ata5.00: failed command: FLUSH CACHE EXT
[242866.xxxxxx] ata8.00: exception Emask 0x0 SAct 0x0 SError 0x0
action 0x6 frozen
[242866.xxxxxx] ata8.00: failed command: FLUSH CACHE EXT
[242866.xxxxxx] ata8.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[242866.xxxxxx]          res 40/00:ff:00:00:00/00:00:00:00:00/00 Emask
0x4 (timeout)
[242866.xxxxxx] ata8.00: status { DRDY }
[242867.xxxxxx] ata5.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
...
[242877.xxxxxx] ata3: COMRESET failed (errno=-16)
[242877.xxxxxx] ata5: COMRESET failed (errno=-16)
...

These kinds of splurs com up once in a minute or so.
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