FreeBSD7-RC1: panic: spin lock held too long

[s3raphi]

I have a FreeBSD7-RC1 AMD-64 system. It has a single Opteron 2224 and a
nvidia chipset. The kernel is default.

Sometimes when I reboot the system, it hangs with the following message on
the screen. This has happened many times, but does not happen every time:

Waiting (max 60 seconds) for system to process 'vnlru' to stop...done
Waiting (max 60 seconds) for system to process ' syncer' to stop...
Syncing disks, vnodes remaining...0 0 done
Waiting (max 60 seconds) for system to process 'bufdaemon' to stop...done
All buffers synced.
Uptime: 3m9s
Rebooting...
cpu_ reset: Stopping other CPUs
Spin lock 0xffffffff80a743a0 (sched lock) held by 0xffffff000122f680 (tid
100002) too long
panic: spin lock held too long
cpuid = 0


When this happens, I power cycle the system and it comes back up with no
problem. 
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