[Bug 195042] New: 10.1 regression: background dhcp client, wlan, lagg, default route page fault

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195042

            Bug ID: 195042
           Summary: 10.1 regression: background dhcp client, wlan, lagg,
                    default route page fault
           Product: Base System
           Version: 10.1-RC2
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: lifanov at mail.lifanov.com

Created attachment 149447
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149447&action=edit
core summary for the crash

This seems to be the case with at least 10.1-RC3, 10.1-RC4, and 10.1-RELEASE,
but not 10.0: if lagg comes up with a wlan interface and dhcp client is
backgrounded, I get a panic when bringing up the default route interface.
This doesn't happen when lagg attaches to a wired interface (timing, probably)
or when I run dhcp client synchronously.
Crash summary is attached.

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