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    SubjectOOPS, ip -f inet6 route get fec0::1, linux-2.6.26, ip6_route_output, rt6_fill_node+0x175
    Date
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    Folks

    Looks like we have an issue with linux-2.6.26 & ipv6

    Scenario: no ipv6 default route set.

    Repro: Enter command

    # ip -f inet6 route get fec0::1

    And we get BUG: unable to handle kernel NULL pointer deref....

    This has been an issue since linux-2.6.26-rc4. It's taken a while to
    nail it. We are currently testing linux-2.6.26.2.

    This appears to have been an issue in the past. This is where I got the
    magic ip route command from.

    http://www.ussg.iu.edu/hypermail/linux/kernel/0510.2/0522.html

    http://www.ussg.iu.edu/hypermail/linux/kernel/0510.2/0535.html

    http://www.ussg.iu.edu/hypermail/linux/kernel/0510.2/1522.html

    ~ # ip -f inet6 route get fec0::1

    Produces, with linux-2.6.26.2,

    BUG: unable to handle kernel NULL pointer dereference at 00000000

    IP: [<c0369b85>] rt6_fill_node+0x175/0x3b0

    *pdpt = 0000000036466001 *pde = 0000000000000000

    Oops: 0000 [#1] SMP

    Modules linked in: pcnet32 smsc47m192 i2c_i801 i2c_dev i2c_core r8169
    coretemp i
    t87 hwmon_vid lcm e1000e



    Pid: 3033, comm: ip Not tainted (2.6.26.2 #1)

    EIP: 0060:[<c0369b85>] EFLAGS: 00010246 CPU: 1

    EIP is at rt6_fill_node+0x175/0x3b0

    EAX: 00000000 EBX: f7115bbc ECX: 00000000 EDX: f7115c60

    ESI: f7c1f100 EDI: f7548f00 EBP: f7115bdc ESP: f7115ba4

    DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068

    Process ip (pid: 3033, ti=f7114000 task=f64cbc50 task.ti=f7114000)

    Stack: f7115bbc 00000000 f7115c54 f7115bc0 f7115c60 f6d75078 00000000
    f7115bdc
    c036a5f0 c036b360 00000000 f75487a0 00000000 f7548f00 f7115c9c
    c036c30e
    f7115c70 00000000 00000018 00000bd9 489b2024 00000000 00000000
    00000000
    Call Trace:

    [<c036a5f0>] ? ip6_route_output+0x50/0xa0

    [<c036b360>] ? ip6_pol_route_output+0x0/0x20

    [<c036c30e>] ? inet6_rtm_getroute+0x16e/0x200

    [<c036c1a0>] ? inet6_rtm_getroute+0x0/0x200

    [<c030ef19>] ? rtnetlink_rcv_msg+0x1b9/0x1f0

    [<c030ed60>] ? rtnetlink_rcv_msg+0x0/0x1f0

    [<c031426d>] ? netlink_rcv_skb+0x8d/0xb0

    [<c030ed57>] ? rtnetlink_rcv+0x17/0x20

    [<c031402d>] ? netlink_unicast+0x23d/0x270

    [<c030162a>] ? memcpy_fromiovec+0x4a/0x70

    [<c0314811>] ? netlink_sendmsg+0x1c1/0x290

    [<c02fa165>] ? sock_sendmsg+0xc5/0xf0

    [<c01363a0>] ? autoremove_wake_function+0x0/0x50

    [<c01363a0>] ? autoremove_wake_function+0x0/0x50

    [<c02fa165>] ? sock_sendmsg+0xc5/0xf0

    [<c0217f37>] ? copy_from_user+0x37/0x70

    [<c03018ec>] ? verify_iovec+0x2c/0x90

    [<c02fa29a>] ? sys_sendmsg+0x10a/0x220

    [<c015ab08>] ? __inc_zone_page_state+0x18/0x20

    [<c01642ed>] ? __page_set_anon_rmap+0x2d/0x40

    [<c0164325>] ? page_add_new_anon_rmap+0x25/0x30

    [<c015eda6>] ? handle_mm_fault+0x606/0x750

    [<c0160f5e>] ? vma_adjust+0xfe/0x410

    [<c0113156>] ? do_page_fault+0x126/0x830

    [<c02fb343>] ? sys_socketcall+0x233/0x260

    [<c0102f39>] ? sysenter_past_esp+0x6a/0x91

    =======================

    Code: 62 01 00 00 c6 43 01 80 8b 45 0c 85 c0 0f 85 13 02 00 00 8b 45 d8
    85 c0 74
    3c 8b 86 88 00 00 00 8d 5d e0 31 c9 89 1c 24 8b 55 d8 <8b> 00 e8 d4 e3
    ff ff 85
    c0 75 20 b9 10 00 00 00 ba 07 00 00 00

    EIP: [<c0369b85>] rt6_fill_node+0x175/0x3b0 SS:ESP 0068:f7115ba4

    ---[ end trace e9f2563374550ae8 ]---


    I will look into producing a patch.

    Best regards

    John Gumb


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