[gentoo-server] XFS problem with 1) quota and 2) kernel 2.6

[Radu-Mihail Obada]

Hello everybody,
This is my first post to this list (although I've been carefully reading 
the messages posted here day by day), so please be gentle :)
I'm a happy admin of a Gentoo Linux box, which has been running 
oh-so-perfectly so far.
My filesystem of choice is XFS (mainly because it supporst POSIX 
Extended Attributes / ACLs). I also like the quota support in XFS, 
because it needs no quota checking, but recently, I've been having so 
problems with it. Mainly, a user which has no quota entry (so it has no 
quota enforcement), is given permission denied when trying to create a 
fifo (that happens on /var, which is a separate partition), the problem 
being noticed with screen, which tries to create a fifo on 
/var/screen/S-radu (yup, *my* user). If I mount the partition without 
quota / usrquota, everything works so fine. I've tried edquota -u radu, 
explicitly setting the quota to 0, but that didn't help. So I'm open to 
suggestions.
As with problem number 2), I've tried to upgrade to mm-sources, but upon 
reboot, I'm spitted a "Kernel panic: Unable to mount root filesystem", 
and just below that, "XFS: SB validate failed". Same happens with 
development-sources.
Just for the record, I'm currently running 2.4.25_pre7-gss-r2.
Any ideas?
Thanks in advance