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    Subject[Bugme-new] [Bug 1595] New: Oops in tcp_v4_get_port (fwd)
    http://bugme.osdl.org/show_bug.cgi?id=1595

    Summary: Oops in tcp_v4_get_port
    Kernel Version: 2.6.0-test9
    Status: NEW
    Severity: high
    Owner: bugme-janitors@lists.osdl.org
    Submitter: francois+kernel@nikita.cx


    Distribution:

    Redhat Linux 7.3

    Hardware Environment:

    Intel Xeon P4, SMP HyperThreading activated

    Software Environment:

    # lsmod
    Module Size Used by
    netconsole 3968 0
    softdog 5188 0
    ipv6 259936 16
    autofs 18432 0
    tg3 64640 0
    e100 60804 0
    ipt_REJECT 7360 1
    iptable_filter 3616 1
    ip_tables 18896 2 ipt_REJECT,iptable_filter

    Problem Description:

    Unable to handle kernel NULL pointer dereference at virtual address 00000049
    printing eip:
    802771a7
    *pde = 00000000
    Oops: 0000 [#1]
    CPU: 1
    EIP: 0060:[<802771a7>] Not tainted
    EFLAGS: 00010246
    EIP is at tcp_v4_get_port+0x1b7/0x300
    eax: 00000000 ebx: f43f5c90 ecx: 00000001 edx: f43f5c80
    esi: f56c1510 edi: f4330b10 ebp: 84837326 esp: f4e11e88
    ds: 007b es: 007b ss: 0068
    Process thttpd (pid: 5659, threadinfo=f4e10000 task=f5a68080)
    Stack: 00000001 00000000 00000000 00000001 f7880280 00000050 bffa6d48 bffa6c00
    ffffffea 00000002 80287fd8 bffa6c00 00000050 00000050 f50af380 f4e11ee4
    00000010 00000000 80241736 f50af380 f4e11ee4 00000010 00000000 50000002
    Call Trace:
    [<80287fd8>] inet_bind+0x158/0x260
    [<80241736>] sys_bind+0x56/0x80
    [<802406be>] sock_map_fd+0xbe/0x120
    [<8024070d>] sock_map_fd+0x10d/0x120
    [<80287985>] inet_setsockopt+0x25/0x30
    [<80241cec>] sys_setsockopt+0x4c/0x80
    [<80241d0e>] sys_setsockopt+0x6e/0x80
    [<802422e3>] sys_socketcall+0xc3/0x250
    [<80165529>] sys_fcntl64+0x69/0x70
    [<8010aa73>] syscall_call+0x7/0xb

    Code: f6 40 49 20 75 52 8d 76 00 8b 44 24 2c 8b 48 04 85 c9 74 0b
    <0>Kernel panic: Fatal exception in interrupt
    In interrupt handler - not syncing
    <0>Rebooting in 15 seconds..

    (gdb) list *(tcp_v4_get_port+0x1b7)
    0x802771a7 is in tcp_v4_get_port (tcp_ipv4.c:195).
    190 struct sock *sk2;
    191 struct hlist_node *node;
    192 int reuse = sk->sk_reuse;
    193
    194 sk_for_each_bound(sk2, node, &tb->owners) {
    195 if (sk != sk2 &&
    196 !ipv6_only_sock(sk2) &&
    197 (!sk->sk_bound_dev_if ||
    198 !sk2->sk_bound_dev_if ||
    199 sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {

    Steps to reproduce:

    eth0 is 10.0.0.1
    eth0:0 is 10.0.0.2

    thttpd listening on 10.0.0.1:80 and serving lots of clients
    modify configuration so thttpd listen on 10.0.0.2:80
    kill thttpd ; restart thttpd
    kernel oops

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