Here is a patch (against the ubuntu package, just as example)
which instead of doing a dumb retry loop, waits for udev.
=== modified file 'debian/changelog'
--- debian/changelog 2010-04-26 15:17:47 +0000
+++ debian/changelog 2010-12-08 21:44:32 +0000
@@ -1,3 +1,15 @@
+initramfs-tools (0.92bubuntu79) natty; urgency=low
+
+ * When using multipath, it is possible that mountroot() will race
+ with udev's renaming of /dev/disk/by-uuid/{rootfs-uuid} from
+ /dev/sd?? to /dev/mapper/something. After multipath has grabbed
+ the /dev/sd?? and until udev completes the rename, mounting
+ /dev/disk/by-uuid/{rootfs-uuid} will fail with -EBUSY. In that
+ case, call 'udevsettle' to wait until udev has finished all its
+ related actions. (Closes LP: #686832)
+
+ -- Serge Hallyn <serge.hal...@ubuntu.com> Fri, 19 Nov 2010 12:19:43 -0600
+
initramfs-tools (0.92bubuntu78) lucid; urgency=low
* hooks/compcache: Escape $-expansions inside <<EOF (thanks, Eugene San;
=== modified file 'scripts/local'
--- scripts/local 2009-12-21 23:06:53 +0000
+++ scripts/local 2010-11-20 01:03:26 +0000
@@ -69,10 +69,19 @@
# FIXME This has no error checking
[ -n "${FSTYPE}" ] && modprobe ${FSTYPE}
- # FIXME This has no error checking
# Mount root
- mount ${roflag} ${FSTYPE:+-t ${FSTYPE} }${ROOTFLAGS} ${ROOT} ${rootmnt}
- mountroot_status="$?"
+ tries=0
+ ret=1
+ while [ $tries -lt 2 -a $ret -ne 0 ]; do
+ mount ${roflag} ${FSTYPE:+-t ${FSTYPE} }${ROOTFLAGS} ${ROOT}
${rootmnt}
+ ret=$?
+ if [ $ret -ne 0 ]; then
+ echo "failed attempt $tries to mount $ROOT as root"
+ udevadm settle
+ tries=$((tries+1))
+ fi
+ done
+ mountroot_status=$ret
if [ "$LOOP" ]; then
if [ "$mountroot_status" != 0 ]; then
if [ ${FSTYPE} = ntfs ] || [ ${FSTYPE} = vfat ]; then
--
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