Re: (KAME-snap 8818) Re: Weird memory exhaustion with FreeBSD 4.10-STABLE

From: B ($B?_at_L@C#:H(B)
Date: 09/30/04

  • Next message: Pekka Savola: "Re: (KAME-snap 8820) Re: Weird memory exhaustion with FreeBSD 4.10-STABLE" 
    Date: Thu, 30 Sep 2004 08:59:21 +0900
To: snap-users@kame.net

    >>>>> On Wed, 29 Sep 2004 11:40:23 +0300 (EEST),
    >>>>> Pekka Savola <pekkas@netcore.fi> said:

    >> >> Okay. Now I think I figure out the problem. Those host routes were
    >> >> created not deliberately, so the kernel will eventually need a fix to
    >> >> this.
    >> >>
    >> >> But if you are in a hurry and/or cannot replace the kernel soon, I
    >> >> think setting net.inet6.ip6.rtexpire to 0 can be a workaround (with
    >> >> this you even do not have to reboot the kernel - though rebooting may
    >> >> also help if you can).
    >>
    >> > Warning: this freezed the system immediately [all network connectivity
    >> > broke, and I had to do a quick reset]. Maybe I should have set it up
    >> > at reboot before the system was in a 'bad' shape..
    >>
    >> Sorry for the trouble, but could you be more specific on "freeze"?
    >> Does it mean the kernel hanged (you could not type anything from the
    >> keyboard, etc)?

    > Unfortunately, I can't. The when my SSH session froze, and the 6to4
    > SSH sessions as well, my first instinct was 'oh, crap', and knee-jerk
    > push of reset button (because the box has no keyboard attached). Sorry
    > for being inprecise.

    Okay, I just found a bug that only happens when ip6.rtexpire is 0.
    Please try the following patch (with rtexpire=0).

                                            JINMEI, Tatuya
                                            Communication Platform Lab.
                                            Corporate R&D Center, Toshiba Corp.
                                            jinmei@isl.rdc.toshiba.co.jp

    Index: in6_rmx.c
    ===================================================================
    RCS file: /home/ncvs/src/sys/netinet6/in6_rmx.c,v
    retrieving revision 1.1.2.3
    diff -u -r1.1.2.3 in6_rmx.c
    --- in6_rmx.c 28 Apr 2002 05:40:27 -0000 1.1.2.3
    +++ in6_rmx.c 29 Sep 2004 23:57:07 -0000
    @@ -270,10 +270,16 @@
                     rt->rt_flags |= RTPRF_OURS;
                     rt->rt_rmx.rmx_expire = time_second + rtq_reallyold;
             } else {
    + struct rtentry *dummy;
    +
    + /*
    + * rtrequest() would recursively call rtfree() without the
    + * dummy entry argument, causing duplicated free.
    + */
                     rtrequest(RTM_DELETE,
                               (struct sockaddr *)rt_key(rt),
                               rt->rt_gateway, rt_mask(rt),
    - rt->rt_flags, 0);
    + rt->rt_flags, &dummy);
             }
     }
     
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