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    Subject"[IPV6]: Fix routing round-robin locking." breaks manual default route (bug 8349)
    Initial state - address, no routes:
    # ip -6 a
    2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qlen 1000
    inet6 2001:4b10:1005:0:202:44ff:fe50:91af/64 scope global
    valid_lft forever preferred_lft forever
    inet6 fe80::202:44ff:fe50:91af/64 scope link
    valid_lft forever preferred_lft forever
    # ip -6 r
    fe80::/64 dev eth0 metric 256 expires 21332290sec mtu 1500 advmss 1440
    ff00::/8 dev eth0 metric 256 expires 21332290sec mtu 1500 advmss 1440
    unreachable default dev lo proto none metric -1 error -101
    # ping6 -c 1 2001:4b10:1005:0:205:b4ff:fe12:530
    connect: Network is unreachable

    Adding a 2000::/3 route works:
    # ip -6 r a 2000::/3 via fe80::230:18ff:feb0:25c2 dev eth0
    # ping6 -c 1 2001:4b10:1005:0:205:b4ff:fe12:530
    64 bytes from 2001:4b10:1005:0:205:b4ff:fe12:530: icmp_seq=1 ttl=64 time=0.921 ms
    # ip -6 r d 2000::/3 via fe80::230:18ff:feb0:25c2 dev eth0

    Adding a ::/0 route doesn't work:
    # ip -6 r a ::/0 via fe80::230:18ff:feb0:25c2 dev eth0
    # ping6 -c 1 2001:4b10:1005:0:205:b4ff:fe12:530
    connect: Network is unreachable

    A route assigned by addrconf works.


    Reverting this patch from 2.6.22-rc3 fixes it:
    commit f11e6659ce9058928d73ff440f9b40a818d628ab
    Author: David S. Miller <davem@sunset.davemloft.net>
    Date: Sat Mar 24 20:36:25 2007 -0700
    [IPV6]: Fix routing round-robin locking.

    This patch is was added to 2.6.20.5, breaking -stable too.


    With RT6_DEBUG 3 in route.c (plus some additional debug statements):

    Manual default route:
    [ 535.981000] fib6_add_rt2node
    [ 535.981000] fib6_add_rt2node fn->fn_flags = 00000007 (RTN_TL_ROOT=00000001)
    [ 535.981000] fib6_add_rt2node fn->leaf = b0697be0 (ip6_null_entry = b0697be0)
    [ 535.981000] fib6_add_rt2node rt->rt6i_flags = 00000003 (RTF_DEFAULT = 00010000, RTF_ADDRCONF = 00040000)
    [ 535.981000] fib6_add_rt2node goto out...
    [ 535.981000] fib6_add_rt2node out:

    Ping6:
    [ 570.903000] rt6_select(fn->leaf=b1b63140, oif=0)
    [ 570.903000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000
    [ 570.903000] find_match m = 10, *mpri = -1
    [ 570.904000] rt6_select() => b0697be0
    [ 570.904000] rt6_select(fn->leaf=b1b63140, oif=0)
    [ 570.904000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000
    [ 570.904000] find_match m = 10, *mpri = -1
    [ 570.904000] rt6_select() => b0697be0


    Addrconf default route:
    [ 624.846000] rt6_select(fn->leaf=b1b63300, oif=2)
    [ 624.846000] find_match rt->rt6i_gateway = 000002ff 00000000 00000000 01000000
    [ 624.846000] find_match m = 10, *mpri = -1
    [ 624.846000] rt6_select() => b1b63300
    [ 624.846000] rt6_select(fn->leaf=b1b63300, oif=2)
    [ 624.846000] find_match rt->rt6i_gateway = 000002ff 00000000 00000000 01000000
    [ 624.846000] find_match m = 10, *mpri = -1
    [ 624.846000] rt6_select() => b1b63300
    [ 624.846000] fib6_add_rt2node
    [ 624.846000] fib6_add_rt2node fn->fn_flags = 00000007 (RTN_TL_ROOT=00000001)
    [ 624.846000] fib6_add_rt2node fn->leaf = b0697be0 (ip6_null_entry = b0697be0)
    [ 624.846000] fib6_add_rt2node rt->rt6i_flags = 00450003 (RTF_DEFAULT = 00010000, RTF_ADDRCONF = 00040000)
    [ 624.846000] fib6_add_rt2node out:

    Ping6:
    [ 689.245000] rt6_select(fn->leaf=b1b63140, oif=0)
    [ 689.245000] find_match rt->rt6i_gateway = 104b0120 00000510 ffb40502 300512fe
    [ 689.245000] find_match m = 10, *mpri = -1
    [ 689.245000] rt6_select() => b1b63140
    [ 689.245000] rt6_select(fn->leaf=b1b63140, oif=0)
    [ 689.245000] find_match rt->rt6i_gateway = 104b0120 00000510 ffb40502 300512fe
    [ 689.245000] find_match m = 10, *mpri = -1
    [ 689.245000] rt6_select() => b1b63140
    [ 689.248000] rt6_select(fn->leaf=b1b63140, oif=0)
    [ 689.248000] find_match rt->rt6i_gateway = 104b0120 00000510 ffb40502 300512fe
    [ 689.248000] find_match m = 10, *mpri = -1
    [ 689.248000] rt6_select() => b1b63140
    [ 689.248000] rt6_select(fn->leaf=b1b63140, oif=0)
    [ 689.248000] find_match rt->rt6i_gateway = 104b0120 00000510 ffb40502 300512fe
    [ 689.248000] find_match m = 10, *mpri = -1
    [ 689.248000] rt6_select() => b1b63140
    [ 689.248000] rt6_select(fn->leaf=b1b63ae0, oif=2)
    [ 689.248000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000
    [ 689.248000] find_match m = 9, *mpri = -1
    [ 689.248000] rt6_select() => b1b63ae0
    [ 689.702000] rt6_select(fn->leaf=b1b63ae0, oif=2)
    [ 689.702000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000
    [ 689.702000] find_match m = 9, *mpri = -1
    [ 689.702000] rt6_select() => b1b63ae0


    Manual 2000::/3 route:
    [ 765.424000] fib6_add_rt2node
    [ 765.424000] fib6_add_rt2node fn->fn_flags = 00000000 (RTN_TL_ROOT=00000001)
    [ 765.424000] fib6_add_rt2node fn->leaf = 00000000 (ip6_null_entry = b0697be0)
    [ 765.424000] fib6_add_rt2node rt->rt6i_flags = 00000003 (RTF_DEFAULT = 00010000, RTF_ADDRCONF = 00040000)
    [ 765.424000] fib6_add_rt2node out:
    [ 765.424000] fib6_add_rt2node fn->fn_flags |= RTN_RTINFO;

    Ping6:
    [ 779.705000] rt6_select(fn->leaf=b1b63060, oif=0)
    [ 779.705000] find_match rt->rt6i_gateway = 000080fe 00000000 ff183002 c225b0fe
    [ 779.705000] find_match m = 10, *mpri = -1
    [ 779.705000] rt6_select() => b1b63060
    [ 779.713000] rt6_select(fn->leaf=b1b63060, oif=0)
    [ 779.713000] find_match rt->rt6i_gateway = 000080fe 00000000 ff183002 c225b0fe
    [ 779.713000] find_match m = 10, *mpri = -1
    [ 779.713000] rt6_select() => b1b63060
    [ 779.714000] rt6_select(fn->leaf=b1b63ae0, oif=2)
    [ 779.714000] find_match rt->rt6i_gateway = 00000000 00000000 00000000 00000000
    [ 779.714000] find_match m = 9, *mpri = -1
    [ 779.714000] rt6_select() => b1b63ae0

    --
    Simon Arlott
    -
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