* Ben Hutchings <ben@decadent.org.uk> [Mon Jan 03, 2011 at 09:03:37PM +0000]: > 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: > > root@gnu:/lib/modules/2.6.32-5-686/kernel/crypto>mv crc32c.ko ~ > > root@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 > > root@gnu:/lib/modules/2.6.32-5-686/kernel/crypto>mv ~/crc32c.ko . > > root@gnu:/lib/modules/2.6.32-5-686/kernel/crypto>insmod ../lib/libcrc32c.ko > > root@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. Thanks for showing up, would be nice to see this fixed. I just want to make sure you're aware of my bugreport #602254 (which Joey seemed to have noticed already according to its BTS history). Ben, do you think this could be fixed at the kernel side? regards, -mika-
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