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Date: Thu, 2 Jan 2014 10:29:46 +0000
Message-ID: <CA+P_MZFTD8QUHiZx_W-+24VLXRKLr1ZEhV3SF2Epm9xPEMR4KA@mail.gmail.com>
Subject: Interface routes left over undeletable with RADIX_MPATH
From: Nikolay Denev <ndenev@gmail.com>
To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
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Hi,

While digging around for the "rtfree 2" panics with RADIX_MPATH I've
reported in misc/185092, (yeah, should've been kern, or net, not misc)
I've noticed that the interface routes that are installed on the
loopback interface are left over when the address is removed and
RADIX_MPATH is used. Moreover, since these now I believe are flagged
as RTF_PINNED it's unable to delete them.

Here is what happens with 10.0-RC3 GENERIC:

    # ifconfig em0 10.10.10.10/24
    # netstat -rnfinet | grep 10.10.10.10
    # 10.10.10.10    link#1    UHS    0    0    lo0
    # ifconfig em0 delete
    # netstat -rnfinet | grep 10.10.10.10
    #

However, this happens with RADIX_MPATH kernel:

    # ifconfig em0 10.10.10.10/24
    # netstat -rnfinet | grep 10.10.10.10
    # 10.10.10.10    link#1    UHS    0    0    lo0
    # ifconfig em0 delete
    # netstat -rnfinet | grep 10.10.10.10
    # 10.10.10.10    link#1    UHS    0    0    lo0
    # route delete 10.10.10.10 -iface lo0
    # route: writing to routing socket: No such process
    # delete host 10.10.10.10: gateway lo0 fib0: not in table

The address is successfully removed from the em0 interface, but the
route over the loopback interface stays, even survives "route flush"


--Nikolay