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From: Maxim Sobolev <sobomax@freebsd.org>
Date: Wed, 13 Jul 2016 13:32:03 -0700
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Subject: 11.0-BETA1 'ifconfig igb0 media auto' causes panic in llentry_free()
To: stable@freebsd.org, FreeBSD Release Engineering Team <re@freebsd.org>
Cc: FreeBSD Net <freebsd-net@freebsd.org>
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Hi, we are seeing consistent crash doing 'ifconfig igb0 media auto' after
interface has been provisioned by the dhcpclient. This is stable/11 sources
from svn revision 302593.

That problem did not happen to us before the upgrade from from 11.0-ALPHA3,
svn revision 301898 from head.

Sreenshot of the backtrace is here:
http://sobomax.sippysoft.com/DSC00012.JPG

-Maxim