[Bug 233306] panic when using userppp

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233306

            Bug ID: 233306
           Summary: panic when using  userppp
           Product: Base System
           Version: 11.2-STABLE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: lenzi.sergio at gmail.com

Created attachment 199328
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=199328&action=edit
this is the core.txt. that is all I have. from the command crashinfo -k
/boot/kernel/kernel vmcore.6

The system panics when there are a lot  10+ ppp connections
  Architecture: i386
  Architecture Version: 2
  Dump Length: 147546112
  Blocksize: 512
  Dumptime: Sun Nov 18 20:15:11 2018
  Hostname: mailserver1.k1.com.br
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 11.2-STABLE #9 r340586M: Sun Nov 18 18:06:09 -02 2018
    lzt at mailserver1.k1.com.br:/usr/obj/usr/src/sys/LZT
  Panic String: page fault
  Dump Parity: 763915341
  Bounds: 6
  Dump Status: good
================================================================================
the server is a tunnel server runs ppp from inetd with the entry:
ppp-in stream tcp nowait/0/1800/0 root /usr/sbin/ppp ppp -direct ppp-in

at some point in time, minutes, hours... the system panics.. in the ppp
program, seems like there is a bug in one of the ng_xxx  module... the system
works find in FreeBSD 10.4 the same kernel no bt is available.

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