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From: Dmitry Sivachenko <trtrmitya@gmail.com>
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Subject: network locks up with udp traffic
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Date: Fri, 23 Jan 2015 17:27:33 +0300
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Hello!

I am using FreeBSD-10/stable.  We have a program at work that transmits =
data via UDP.
When I run several instances of this program simultaneously, after a few =
seconds network stops working.
If I login from console, I see some network daemons like ntpd, snmpd are =
in "*udp" state.

If I try to deal with network interface (ifconfig igb0 for instance), =
ifconfig utility stuck in "L" state (Marks a process that is waiting to =
acquire a lock.).
I found the only way to fix that: reboot.

What can be the cause for such a behaviour?

Thanks.=