Jarek Poplawski wrote: ...
And then I've found this strange thing: packets outgoing from lo to any local address are hooked to IMQ queue from PREROUTING (on ingress). I know they are going there from OUTPUT for routing decision and should be delivered to hooks in PREROUTING like IMQ, but they also should not have IMQ flag set at the moment (they will be "tagged" by iptables in the POSTROUTING future!). But for some reasons (probably some shortcut) they do have this flag and IMQ egress queue is not on their way.
Bad diagnose! There is no shortcut. Only in my testing procedure: I've switched off the egress hook, so the IMQ flag traveled from POSTROUTING to PREROUTING not annoyed. I forgot it isn't the real device. Sorry for misleading.
So I added this short test in imq_nf_hook and my soft lockups are gone.
Nevertheles this method works. I dont't know why, yet. It exludes one direction of local traffic from queuing but who cares?
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