As already reported to lkml and IDE maintainer for 2.6.12-rc2:

Oops on 'cardctl eject' of an IDE flash disk (Pretec ATA Flash 16MB).
2.6.11.2 works fine.

System:
Linux (none) 2.6.12-rc3-gringo #1 Thu Apr 21 15:45:08 CEST 2005 x86_64
unknown unknown GNU/Linux

Kernel messages from startup to and including Oops as well as config are
attached.
-- 
Andreas Steinmetz                       SPAMmers use robotrap@domdv.de