vmware guest crash spinlock lockup - bugzilla-able ?

[dtimms at iinet.net.au]

Hi, I have some machines:
pc1: dell sc430   , 1GB, raid 1 software, intel x86_64 kernel
pc2: shuttle xcube, 1GB, raid 1 software, intel i686 kernel
os1+2: fc6 +updated 2007-01-04, vmware-server-1.0.1

Both machines run two vmware-guests:
1: fc6 +updated 2007-01-04, samba server, winbind
2: fc6 +updated 2007-01-04, dns, dhcp, openldap.
All real and guest vms are running kernel-2.6.18-1.2868.fc6 #1 SMP 
After about 48 hours, pc1-vm1 crashed, restarted and still OK. 3 days.
Today I have found that pc2-vm1 and pc2-vm2 have crashed.

Message left on pc2:vm2 screen summary:
 worker_thread
 kthread
 kthread
 kernel_thread
=====
BUG: spinlock lockup on CPU#0, modprobe/13636  (Not tainted)
 dump_trace
 show_trace_log_lvl
 show_trace
 dump_stack
 _raw_spin_lock
 cache_alloc_refill
 kmem_cache_alloc
 get_empty_filp
 __path_lookup_open
 open_name
 do_filp_open
 do_sys_open
 sys_open
 syscall_call
DWARF2 unwinder stuck at syscall_call
Leftover inexact backtrace:
=====

the visible part of the trace with the other vm is different, but mentions the
same spinlock and DWARF messages.

The server and vm guests have quite a few services either disabled or removed,
to reduce overall machine load.

Is this an issue that needs to be reported to bugzilla.redhat ?
Or is there another bug report location that would be best.

DaveT.