Booting INSTALL kernel fails with "no file system for md0"

[Andreas Gustafsson <gson%gson.org@localhost>]

Hello all,

The NetBSD-current INSTALL kernel no longer boots; it fail as follows:

  boot device: fd0
  root on md0a dumps on md0b
  Supported file systems: tmpfs ntfs nfs msdos mfs ext2fs ffs cd9660
  no file system for md0 (dev 0x1100)
  cannot mount root, error = 79

On i386, the bug can be reproduced by installing misc/py-anita from
pkgsrc (you need version 1.9 or newer) and running the shell command

  anita install 
http://nyftp.netbsd.org/pub/NetBSD-daily/HEAD/201002020000Z/i386/

It looks like the breakage occurred some time between CVS dates
2010.01.31.10.50.23 and 2010.01.31.14.30.22.  Here is the list of
commits made during that time:

  2010.01.31.10.50.23 mlelstv src/sys/ufs/ffs/ffs_vfsops.c,v 1.255
  2010.01.31.10.54.10 mlelstv src/sys/ufs/ffs/ffs_vfsops.c,v 1.256
  2010.01.31.10.54.10 mlelstv src/sys/ufs/ffs/fs.h,v 1.55
  2010.01.31.11.16.18 jruoho src/sys/dev/acpi/acpi_acad.c,v 1.39
  2010.01.31.11.19.40 jruoho src/sys/arch/i386/conf/ALL,v 1.230
  2010.01.31.11.26.20 jruoho src/sys/dev/acpi/acpi.c,v 1.148
  2010.01.31.11.26.20 jruoho src/sys/dev/acpi/acpi_debug.c,v 1.1
  2010.01.31.11.26.20 jruoho src/sys/dev/acpi/acpivar.h,v 1.40
  2010.01.31.11.26.20 jruoho src/sys/dev/acpi/files.acpi,v 1.65
  2010.01.31.11.29.31 jruoho src/share/man/man4/acpi.4,v 1.35
  2010.01.31.11.39.55 mlelstv src/sys/arch/x86/x86/ipmi.c,v 1.42
  2010.01.31.11.54.32 skrll src/sys/kern/subr_kmem.c,v 1.32
  2010.01.31.12.07.37 jruoho src/share/man/man4/acpi.4,v 1.36
  2010.01.31.12.14.45 jruoho src/sys/arch/i386/conf/ALL,v 1.231
  2010.01.31.12.14.45 jruoho src/sys/arch/i386/conf/GENERIC,v 1.962
  2010.01.31.12.20.22 jruoho src/sys/arch/amd64/conf/GENERIC,v 1.263
  2010.01.31.13.15.08 pooka src/sys/rump/librump/rumpvfs/rumpblk.c,v 1.37
  2010.01.31.14.30.22 mlelstv src/tests/fs/ffs/Makefile,v 1.5

-- 
Andreas Gustafsson, gson%gson.org@localhost