[Bug 216171] [ipfw] [panic] stable/11: repeating KASSERT("rm_rlock: recursed on non-recursive rmlock") crash

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216171

            Bug ID: 216171
           Summary: [ipfw] [panic] stable/11: repeating KASSERT("rm_rlock:
                    recursed on non-recursive rmlock") crash
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ports at grosbein.net

Created attachment 178985
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178985&action=edit
kgdb script

One of my uniprocessor systems (11.0-STABLE/i386 r307472) having debugging
kernel repeatedly panices with same backtrace generating crashdumps:

total 1248464
-rw-r--r--  1 root  wheel          2 Jan 17 04:25 bounds
-rw-------  1 root  wheel        538 Jan 12 03:07 info.0
-rw-------  1 root  wheel        537 Jan 12 05:01 info.1
-rw-------  1 root  wheel        538 Jan 12 10:53 info.2
-rw-------  1 root  wheel        539 Jan 13 19:22 info.3
-rw-------  1 root  wheel        539 Jan 14 11:54 info.4
-rw-------  1 root  wheel        539 Jan 15 13:28 info.5
-rw-------  1 root  wheel        539 Jan 16 11:46 info.6
-rw-------  1 root  wheel        538 Jan 16 20:16 info.7
-rw-------  1 root  wheel        538 Jan 17 04:25 info.8
-rw-------  1 root  wheel        536 Jan 11 16:48 info.9
lrwxr-xr-x  1 root  wheel          6 Jan 17 04:25 info.last -> info.8
-rw-r--r--  1 root  wheel          5 Oct  3  2012 minfree
-rw-------  1 root  wheel  165212160 Jan 12 03:07 vmcore.0
-rw-------  1 root  wheel   94773248 Jan 12 05:01 vmcore.1
-rw-------  1 root  wheel   94265344 Jan 12 10:54 vmcore.2
-rw-------  1 root  wheel  160993280 Jan 13 19:22 vmcore.3
-rw-------  1 root  wheel  150310912 Jan 14 11:54 vmcore.4
-rw-------  1 root  wheel  150302720 Jan 15 13:28 vmcore.5
-rw-------  1 root  wheel  160186368 Jan 16 11:46 vmcore.6
-rw-------  1 root  wheel   94715904 Jan 16 20:16 vmcore.7
-rw-------  1 root  wheel  160612352 Jan 17 04:25 vmcore.8
-rw-------  1 root  wheel   94748672 Jan 11 16:48 vmcore.9
lrwxr-xr-x  1 root  wheel          8 Jan 17 04:25 vmcore.last -> vmcore.8

List of ipfw rules:

# ipfw show
00100     0       0 allow ip from any to any via lo0
00200     0       0 deny ip from any to 127.0.0.0/8
00300     0       0 deny ip from 127.0.0.0/8 to any
01010     0       0 allow tcp from 62.231.161.0/24{66,72,80} to me dst-port
23,3001-3006 in
01020     0       0 allow tcp from 62.231.161.216/29,62.231.161.232/29 to me
dst-port 23,3001-3006 in
01020     0       0 unreach port udp from not 62.231.160.18 to me dst-port
1812,1813,21645-21844 in
01030     0       0 allow tcp from 62.231.161.71 to me dst-port 23,3001-3006 in
01090   489   20408 reset tcp from any to me dst-port 23,3001-3006 in
65000 11822 2211829 allow ip from any to any
65535     0       0 deny ip from any to any

kgdb script is attached.
Compressed kernel.debug, crashinfo and vmcore are available here:
http://www.grosbein.net/freebsd/crash/20170117/

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