ORA-1628 spewing into alert.log on 11.2.0.1?

Anyone seen this before?  I'm running 11.2.0.1, 4-node RAC, on RHEL 5.3, x64-64.

I'm seeing continual spewing of the following line into my alert log:
ORA-1628: max # extents  32765 reached for rollback segment 
_SYSSMU29_3170879604$

Many, many times per second.  This is happening only on one node.

I checked MetaLink, and there's a bug, but it's supposedly fixed in 11.1.0.7, 
and the sample queries they have to run do not seem to indicate this bug.

Anyone else seen this?

Thanks,

-Mark

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