bcache hang on suspend? sometimes?

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Hi,

Lately (i.e. 3.10.5) I thought I'd give bcache a try on my work laptop.  I
paired up a boring SATA SSD with one of those newfangled 4k "advanced format"
drives, and formatted the whole stack with dm-crypt + lvm + ext4 on top of
bcache.  Things were looking pretty good -- LKML loads much faster in mutt, and
all was well with the world, even suspend/resume worked fine.

Then I rebooted the machine.  After the reboot, the machine will hang every
time I suspend.  I set up netconsole and set no_console_suspend=1, but nothing
interesting showed up in dmesg.  I see that SCSI managed to flush the disks,
but everything seems to stop dead.  No lockup messages or anything.

Curiously, if I set up a bcache between that SSD and a 512-byte-sector old
school disk, suspend/resume seem fine even after a reboot.  My bcache test
machine also suspends/resumes just fine.  I tried simulating a 4k disk with
qemu to see if I could arrange an easier testcase, but I couldn't reproduce the
hang there either.  (Yes, I do have bcache debugging turned on.)

I'll keep plugging away on this as time permits, but I was wondering -- has
anyone else seen this before?  Is this my own little crazy party?  I was
careful to make sure everything on the AF drive lined up on a 4k alignment.

<shrug>

--D
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