NICs locking up, "*tcp_sc_h"
nick at nickwithers.com
Wed Mar 18 05:33:54 PDT 2009
On Wed, 2009-03-18 at 11:52 +0000, Robert Watson wrote:
> On Sun, 15 Mar 2009, Nick Withers wrote:
> >> I'll need to think a bit about a proper fix for this, but you'll find the
> >> problem likely goes away if you eliminate all uid/gid/jail rules from your
> >> firewall. You could also tweak the syncache logic not to use a retransmit
> >> timer, which might slightly extend the time it takes for systems to connect
> >> to your host in the presence of packet loss, but would eliminate this
> >> transmission path entirely. We'll need a real and more general fix,
> >> however, to commit, and I'll look and see what I can come up with.
> > Brilliant, thanks very much. I'll work without uid rules for the time being,
> > then.
> Could I ask you to file a PR on this problem, btw, with the two traces I
> singled out as interesting included, then forward me the PR receipt? That
> will make the problem easier to keep track of.
Done - Please see newborn kern/132774!
> We're currently pondering ways to fix the problem that don't disturb the
> stability of the ABI, and may have a workaround patch available shortly that's
> appropriate for MFC.
Wow! Must admit I'd assumed this one was going to take a while to sort
out, so I'm certainly happy to hear this.
Cheers very much!
> Robert N M Watson
> Computer Laboratory
> University of Cambridge
email: nick at nickwithers.com
Mobile: +61 414 397 446
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