Hello Gerrit, it is nice to know that you confirmed my bug report. Good job, I just read the attached patch. Is the patch already in the test tree? Thank you, Leandro. On Sun, May 18, 2008 at 1:09 PM, Gerrit Renker <gerrit@xxxxxxxxxxxxxx> wrote: > > Leandro, > > I can now confirm that this is indeed a bug. It is caused by the client > not retransmitting Confirm options while in state PARTOPEN. > > A detailed analysis with capture files has been uploaded to > http://www.erg.abdn.ac.uk/users/gerrit/dccp/notes/feature_negotiation/why_retransmit_confirms/ > > The fix is to retransmit Confirm options until entering OPEN state. > A patch is attached and has been put into the test tree. > > There is another bug fix involved, this is documented on the website, > will send second patch subsequently. > > Many thanks for testing and reporting. > Gerrit > > | Hi Gerrit, during some experiments using iperf to transmit one TCP > | flow against 3 DCCP flows, one DCCP thread stopped and it was shown > | the following message: > | > | "[ 6286.864021] BUG: Failed negotiation in state 2 at > | net/dccp/feat.c:1370/dccp_feat_activate_values()" > | > | Here it is the complete debug msgs including the dumped stack at the > | time the error occurred: > | > | {...} > | [ 6286.864021] BUG: Failed negotiation in state 2 at > | net/dccp/feat.c:1370/dccp_feat_activate_values() > | [ 6286.864034] Pid: 0, comm: swapper Not tainted 2.6.25-rc3 #4 > | [ 6286.864034] [<c045c6bb>] dccp_feat_activate_values+0x7b/0x200 > | [ 6286.864034] [<c045f919>] dccp_create_openreq_child+0xb9/0x100 > | [ 6286.864034] [<c0465226>] dccp_v4_request_recv_sock+0x46/0x1b0 > | [ 6286.864034] [<c045f72e>] dccp_check_req+0x24e/0x380 > | [ 6286.864034] [<c04526b0>] ipt_hook+0x0/0x20 > | [ 6286.864034] [<c046543a>] dccp_v4_do_rcv+0xaa/0x160 > | [ 6286.864034] [<c03fb560>] sk_receive_skb+0xc0/0x110 > | [ 6286.864034] [<c04216c6>] ip_local_deliver_finish+0x66/0x120 > | [ 6286.864034] [<c0421660>] ip_local_deliver_finish+0x0/0x120 > | [ 6286.864034] [<c042144b>] ip_rcv_finish+0xfb/0x310 > | [ 6286.864034] [<c045b9b6>] packet_rcv_spkt+0x36/0x160 > | [ 6286.864034] [<c0421880>] ip_rcv+0x0/0x290 > | [ 6286.864034] [<c04028ed>] netif_receive_skb+0x19d/0x230 > | [ 6286.864034] [<c0405133>] process_backlog+0x63/0xd0 > | [ 6286.864034] [<c0404a99>] net_rx_action+0x89/0x180 > | [ 6286.864034] [<c01263e2>] __do_softirq+0x72/0xf0 > | [ 6286.864034] [<c0126497>] do_softirq+0x37/0x40 > | [ 6286.864034] [<c01065b0>] do_IRQ+0x40/0x70 > | [ 6286.864034] [<c0104b1f>] common_interrupt+0x23/0x28 > | [ 6286.864034] [<c01300d8>] sys_setdomainname+0x58/0xb0 > | [ 6286.864034] [<c0102d92>] default_idle+0x52/0x80 > | [ 6286.864034] [<c0102d40>] default_idle+0x0/0x80 > | [ 6286.864034] [<c0102bdd>] cpu_idle+0x4d/0xd0 > | [ 6286.864034] ======================= -- Leandro Melo de Sales. Pervasive and Embedded Computing Laboratory BRisa and E-Phone Projects Manager Network Admin @ http://embedded.ufcg.edu.br/indexen.html +55 83 3310-1404 (extension 208) http://www.leandrosales.com/ -- To unsubscribe from this list: send the line "unsubscribe dccp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
