There are two possible causes for this kernel memory leak.
There's a bug in the volume management device driver that when unloaded leaks memory: fix with patch 101907-05 (sparc) or 101908-07 (x86). This bug especially affects systems not running vold, as it is triggered when the kernel decides to unload unused device drivers.
The NFS client cache will cache too much. A simple workaround is to add ``set nrnode = 1000'' to /etc/system and reboot. You may want to make this larger or smaller depending on how much memory you have. A good rule of thumb is about 20-30 rnodes per MB of memory.
Another possible candidate is an overflow in /tmp or other swap based (tmpfs) filesystems. Check with df/du.
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