I've got a crash with a dual Intel system, compiled from
the sommerfeld... branch a couple of days ago.
The box is diskless, I was compiling some stuff via NFS.

Looks like page queue corruption.
Here are some stack trace data:

fault at uvm_pagedequeue+0x45: movl %eax, 0x4(%edx)
edx=0xf883fffb

cpu 0:
uvm_pagedequeue
uvm_pageactivate
uvmpd_scan_inactive
uvmpd_scan
uvm_pageout

cpu 1:
_spinlock_acquire_count
mi_switch
bpendtsleep
sbwait
soreceive
nfs_receive
nfs_reply
nfs_request
nfs_readrpc
nfs_doio
nfs_strategy
VOP_STRATEGY
genfs_getpages
nfs_getpages
VOP_GETPAGES
genfs_getpages
nfs_getpages
VOP_GETPAGES
ubc_fault
uvm_fault
trap
i486_copyout
nfs_bioread
nfs_read
VOP_READ
vn_read
dofileread
sys_read
syscall_plain

best regards
Matthias