On Mon, 2011-01-03 at 16:37 -0400, Joey Hess wrote: > I hope this can be dealt with, it seems to be the only remaining > issue in getting Debian to support btrfs root filesystems. > > This is easily reproducible, I installed from a recent daily build > netinst, put /boot on ext3 and / on btrfs and same problem on boot. > > The problem is that btrfs depends on libcrc32c, which demand loads > any of several crc32c implementations, depending on hardware. Those > modules are not declared as dependencies, so initramfs-tools does not > include them. > > So, another way to see the same problem: > > r...@gnu:/lib/modules/2.6.32-5-686/kernel/crypto>mv crc32c.ko ~ > r...@gnu:/lib/modules/2.6.32-5-686/kernel/crypto>insmod ../lib/libcrc32c.ko > insmod: error inserting '../lib/libcrc32c.ko': -1 Unknown symbol in module > r...@gnu:/lib/modules/2.6.32-5-686/kernel/crypto>mv ~/crc32c.ko . > r...@gnu:/lib/modules/2.6.32-5-686/kernel/crypto>insmod ../lib/libcrc32c.ko > r...@gnu:/lib/modules/2.6.32-5-686/kernel/crypto> > > So, at least a workaround would be for the initramfs to have crc32c added to > it whenever libcrc32c is. Attached patch just adds it to the base modules > list; since btrfs is already there that seems like an ok quick fix.
This is stupid. Without a declared module dependency, a MODULES=dep configuration will remain broken. I think this needs to be fixed in the kernel instead. > Note that it would probably be better to try first loading hardware optimised > versions like crc32c-intel, and only load crc32c if they fail to load. I believe that happens automatically, as the hardware-optimised modules provide an alias of 'crc32c'. > (BTW, this bug probably also breaks netbooting with certian ethernet cards > whose drivers also use libcrc32c.) Right. Ben. -- Ben Hutchings Once a job is fouled up, anything done to improve it makes it worse.
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