Volker, I haven't tried running NetBSD as a domU for a long time.
It seems that the domU is using 'page flip' mode to transfer network packets from dom0 to the guest domain. None of the guests that we regularly use take this path any more (they use 'hypervisor copy' mode), so it's possible that the code in the Solaris driver has gone rotten.
It would be interesting if you could get a more detailed stack trace from the system using the dump or kernel debugger. Instructions on how to reproduce the problem (where to get the images, etc.) might also help.
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