[Bug 248243] FreeBsd crash when switching interface off and on again in cohesion with multicast

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248243

            Bug ID: 248243
           Summary: FreeBsd crash when switching interface off and on
                    again in cohesion with multicast
           Product: Base System
           Version: 12.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Keywords: IntelNetworking, iflib, needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: l.m.v.breda at xs4all.nl
             Flags: maintainer-feedback+

Hello,

I try to get PIMD running on latest pfSense release. One of the two problems I
am facing is that FreeBsd as crashing as soon as I switch off and on again one
of the interfaces, especially the interface being used as PIMD register_vif.

Hereby the relevant lines from "the core dump"

curthread    = 0xfffff8000439f000: pid 12 tid 100040 "swi1: netisr 2"


Tracing pid 12 tid 100040 td 0xfffff8000439f000

kdb_enter() at kdb_enter+0x37/frame 0xfffffe00004de4b0
vpanic() at vpanic+0x197/frame 0xfffffe00004de500
panic() at panic+0x43/frame 0xfffffe00004de560
trap_fatal() at trap_fatal+0x391/frame 0xfffffe00004de5c0
trap_pfault() at trap_pfault+0x4f/frame 0xfffffe00004de610
trap() at trap+0x286/frame 0xfffffe00004de720
calltrap() at calltrap+0x8/frame 0xfffffe00004de720
***--- trap 0xc, rip = 0xffffffff80e934f5, rsp = 0xfffffe00004de7f0, rbp = 

0xfffffe00004de7f0 ---***
if_inc_counter() at if_inc_counter+0x15/frame 0xfffffe00004de7f0
if_simloop() at if_simloop+0xd1/frame 0xfffffe00004de830
***pim_input() at pim_input+0x409/frame 0xfffffe00004de890***

encap_input() at encap_input+0xd1/frame 0xfffffe00004de900
encap4_input() at encap4_input+0x28/frame 0xfffffe00004de930
ip_input() at ip_input+0x168/frame 0xfffffe00004de9e0
swi_net() at swi_net+0x12b/frame 0xfffffe00004dea50
ithread_loop() at ithread_loop+0x23c/frame 0xfffffe00004deab0
fork_exit() at fork_exit+0x7e/frame 0xfffffe00004deaf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00004deaf0 


IMHO the problem is like this:
- pim is asking som info from underlying core
- that is translated into a trap
- the trap is not handled correctly and/or parameters are not correct
- the trap is handeld by thread 12 "swi1: netisr 2"
- which lead to a fatal crash


Louis
PS related but another problem #248103

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