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    SubjectBUG: warning at net/core/dev.c:1171/skb_checksum_help() 2.6.18-rc3
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    Hash: SHA1

    This machine has four NICs running the e1000 kernel module. Other than
    the BUG() messages, it seems to be running fine. I was running 2.6.15.4
    without any issues on the same hardware, although I noticed the e1000
    has been updated (and I went for rc3 since I was hitting the panic in -rc2)

    Now, I'm not sure if it also has anything to do with this message:

    NAT: no longer support implicit source local NAT
    NAT: packet src 10.1.1.1 -> dst 207.166.203.131

    Any suggestions as to how to go about debugging this?

    BUG: warning at net/core/dev.c:1171/skb_checksum_help()
    [<c02e0412>] skb_checksum_help+0x4d/0xf0
    [<c034e4d3>] ip_nat_fn+0x4e/0x19e
    [<c034e78e>] ip_nat_local_fn+0x3d/0xb9
    [<c0314011>] dst_output+0x0/0x7
    [<c03059ee>] nf_iterate+0x40/0x6e
    BUG: warning at net/core/dev.c:1171/skb_checksum_help()
    [<c02e0412>] skb_checksum_help+0x4d/0xf0
    [<c034e4d3>] ip_nat_fn+0x4e/0x19e
    [<c034e78e>] ip_nat_local_fn+0x3d/0xb9
    [<c0314011>] dst_output+0x0/0x7
    [<c03059ee>] nf_iterate+0x40/0x6e
    [<c0314011>] dst_output+0x0/0x7
    [<c0305a5e>] nf_hook_slow+0x42/0x98
    [<c0314011>] dst_output+0x0/0x7
    [<c03123c4>] ip_queue_xmit+0x3a3/0x3fc
    [<c0314011>] dst_output+0x0/0x7
    [<c037f544>] xprt_timer+0x0/0x65
    [<c01e7964>] __next_cpu+0x12/0x1f
    [<c0112a8c>] find_busiest_group+0x17e/0x473
    [<c0320d17>] tcp_transmit_skb+0x39f/0x3bc
    [<c0321f7a>] tcp_write_xmit+0x1a8/0x210
    [<c0322000>] __tcp_push_pending_frames+0x1e/0x6f
    [<c0317d5d>] do_tcp_sendpages+0x4fa/0x521
    [<c0317dcf>] tcp_sendpage+0x4b/0x5e
    [<c02d7fa7>] sock_sendpage+0x31/0x37
    [<c013242e>] file_send_actor+0x30/0x4a
    [<c0131e0b>] do_generic_mapping_read+0x167/0x3d5
    [<c013248a>] generic_file_sendfile+0x42/0x55
    [<c01323fe>] file_send_actor+0x0/0x4a
    [<c019a141>] nfs_file_sendfile+0x59/0x60
    [<c01323fe>] file_send_actor+0x0/0x4a
    [<c014ad07>] do_sendfile+0x1b8/0x252
    [<c01323fe>] file_send_actor+0x0/0x4a
    [<c014adec>] sys_sendfile+0x4b/0x86
    [<c010272f>] syscall_call+0x7/0xb
    BUG: warning at net/core/dev.c:1225/skb_gso_segment()
    [<c02e053d>] skb_gso_segment+0x88/0x179
    [<c02e06db>] dev_gso_segment+0x5c/0x82
    [<c02e074a>] dev_hard_start_xmit+0x49/0xb1
    [<c02e0957>] dev_queue_xmit+0x1a5/0x21f
    [<c0311fea>] ip_output+0x1ce/0x205
    [<c03123d6>] ip_queue_xmit+0x3b5/0x3fc
    [<c037f544>] xprt_timer+0x0/0x65
    [<c01e7964>] __next_cpu+0x12/0x1f
    [<c0112a8c>] find_busiest_group+0x17e/0x473
    [<c0320d17>] tcp_transmit_skb+0x39f/0x3bc
    [<c0321f7a>] tcp_write_xmit+0x1a8/0x210
    [<c0322000>] __tcp_push_pending_frames+0x1e/0x6f
    [<c0317d5d>] do_tcp_sendpages+0x4fa/0x521
    [<c0317dcf>] tcp_sendpprintk: 19 messages suppressed.
    age+0x4b/0x5e
    eth2.300: received packet with own address as source address
    [<c02d7fa7>] sock_sendpage+0x31/0x37
    [<c013242e>] file_send_actor+0x30/0x4a
    [<c0131e0b>] do_generic_mapping_read+0x167/0x3d5
    [<c013248a>] generic_file_sendfile+0x42/0x55
    [<c01323fe>] file_send_actor+0x0/0x4a
    [<c019a141>] nfs_file_sendfile+0x59/0x60
    [<c01323fe>] file_send_actor+0x0/0x4a
    [<c014ad07>] do_sendfile+0x1b8/0x252
    [<c01323fe>] file_send_actor+0x0/0x4a
    [<c014adec>] sys_sendfile+0x4b/0x86
    [<c010272f>] syscall_call+0x7/0xb
    [<c0314011>] dst_output+0x0/0x7
    [<c0305a5e>] nf_hook_slow+0x42/0x98
    [<c0314011>] dst_output+0x0/0x7
    [<c03123c4>] ip_queue_xmit+0x3a3/0x3fc
    [<c0314011>] dst_output+0x0/0x7
    [<c037f544>] xprt_timer+0x0/0x65
    [<c01e7964>] __next_cpu+0x12/0x1f
    [<c0112a8c>] find_busiest_group+0x17e/0x473
    [<c0320d17>] tcp_transmit_skb+0x39f/0x3bc
    [<c0321f7a>] tcp_write_xmit+0x1a8/0x210
    [<c0322000>] __tcp_push_pending_frames+0x1e/0x6f
    [<c0317d5d>] do_tcp_sendpages+0x4fa/0x521
    [<c0317dcf>] tcp_sendpage+0x4b/0x5e
    [<c02d7fa7>] sock_sendpage+0x31/0x37
    [<c013242e>] file_send_actor+0x30/0x4a
    [<c0131e0b>] do_generic_mapping_read+0x167/0x3d5
    [<c013248a>] generic_file_sendfile+0x42/0x55
    [<c01323fe>] file_send_actor+0x0/0x4a
    [<c019a141>] nfs_file_sendfile+0x59/0x60
    [<c01323fe>] file_send_actor+0x0/0x4a
    [<c014ad07>] do_sendfile+0x1b8/0x252
    [<c01323fe>] file_send_actor+0x0/0x4a
    [<c014adec>] sys_sendfile+0x4b/0x86
    [<c010272f>] syscall_call+0x7/0xb

    David

    - --
    David J. Coulson
    email: david@davidcoulson.net
    web: http://www.davidcoulson.net/

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