Whoops; forgot to send this e-mail to the whole list. :)
So I have some unfortunate test results regarding this corruption
issue. I tested my laptop on two kernels I built today. The
procedure was as follows:
1. Check out bcache-3.10-stable. Kernal was build using the
.config I have for Debian package
linux-image-3.10-0.bpo.2-686-pae=3.10.5-1~bpo70+1. All new options
were left at defaults.
2. Begin by checking out bcache git repository at
bcache-for-3.11. Next, add Linux stable git as an origin. Then, "git
br temp; git co temp; git merge linux-3.11.y". The merge applies
automatically. Build the resulting kernel, again using the above
.config with all new options left at defaults.
My hope was that one of these two kernels would resolve both (a) the
cache corruption issue and (b) my hibernate/suspend problem. This did
not appear to be the case. Using kernel #2 above (Linux 3.11.0),
cache corruption was immediately evident; both apt-cacher and MySQL
failed to start due to segfaults. Cache corruption was resolved by
detaching and reattaching the cache device under a clean kernel.
Using kernel #1 above, I get the same results as the Debian stock
kernel for Wheezy backports (the one from the package named above):
bcache seems to work just fine until the kernel attempts to stop
devices for suspend, hibernate, or shutdown; at this point, bcache
times out waiting for the device to stop and the laptop never changes
power states.
For the time being, it is easier for me to live without
suspend/hibernate than it is for me to migrate back to a cacheless
layout; moving all of that data around is time-consuming and I really
want to use bcache. :) If there is any information I could collect
with my machine that would help in the debugging process, please let
me know!
Thanks,
Zach
[This mail was also posted to gmane.linux.kernel.bcache.devel.]
On Tue, 03 Sep 2013 17:26:40 -0400, Zachary Palmer wrote:
So here's the question: how would I best go about testing this patch?
In looking through the git history, it doesn't seem as if the
bcache-for-3.11 branch has been synced against the Linux git since
3.10-rc7 (on June 22nd). I was thinking I could
* Pull the Linux kernel source
* Add the bcache git as an origin
* Merge the bcache-for-3.11 branch into the Linux 3.11 mainline
branch myself and
* Assuming that this works, compile and boot the resulting kernel
using my Debian kernel .config
Does this sound reasonable? Or is there a better way to do this? I'm
pretty happy with whatever gives me at least the behavior of my
mainline
3.10 kernel and I'm looking forward to getting bcache and laptop power
modes on the same machine. :)
Yeah, it'll merge cleanly. You can reuse the .config and build with
`make deb-pkg -j -l6`, which is slowly replacing make-kpkg
functionality.
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