[Bug 236833] Radix_Mpath ifa_maintain_loopback_route: switch failed for interface

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236833

            Bug ID: 236833
           Summary: Radix_Mpath ifa_maintain_loopback_route: switch failed
                    for interface
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: grzesiek at bajtnetbusko.pl

When the RADIX_MPATH option is added in the kernel, an error occurs.

a_maintain_loopback_route: switch failed for interface ngx: 3

Configuration 11.2-RELEASE-p9. Demon MPD5 as pppoe server with two or more
connected pppoe sessions, when disconnecting the interface ng0 when in the
routing table on the interface ng0 is loopback does not change the entry on
interface ng1 and there is an error "fa_maintain_loopback_route: switch failed
for interface ng1: 3"

netstat -rn
192.168.249.1 link#9 UHS lo0
192.1.1.2 link#9 UH ng0
192.1.1.3 link#10 UH ng1

after disconnecting ng0
netstat -rn
192.168.249.1 link#9 UHS lo0
192.1.1.2 link#10 UH ng1

when the disconnection of both sessions appears an error "
ifa_maintain_loopback_route: deletion failed for interface ng1: 3 "and you can
not delete the entry in the routing table.

netstat -rn
192.168.249.1 link#9 UHS lo0

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