I am wondering whether a stacked software driver is what's calling the bnx start routine in BBN's case. The locking in some of those is kind of dodgy. I don't think that's it. While we're doing some complicated things in a private tree, chasing down this problem led to backing off on those things and finally running a build of just netbsd-6, and then just pushing traffic over the interfaces, without any odd configuration. (It does seem to take multiple flows on multiple interfaces to lead to the issue.)
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