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