Panic - FFS background buffer bla bla

[Eric Anderson]

I just switched from 5.3-STABLE to 6.0-CURRENT on my laptop, and after 
doing the recommended path of upgrading (in /usr/src/UPDATING), I get 
this on boot:

(background fsck runs on /, then spits out warning about /home not 
properly dismounted)
then:
panic: FFS background buffer should not get here 0xd19e6928
cpuid = 0
KDB: enter: panic
[thread pid 126 tid 100079]


Any hints?

Eric