Sure, Thanks On 2014/11/2 5:06, David Miller wrote: > From: Chen Weilong <chenweil...@huawei.com> > Date: Fri, 31 Oct 2014 22:50:47 +0800 > >> From: Weilong Chen <chenweil...@huawei.com> >> >> We got a problem like this: >> [ffff8801c1a05570] machine_kexec at ffffffff81025039 >> [ffff8801c1a055d0] crash_kexec at ffffffff8109b253 >> [ffff8801c1a056a0] oops_end at ffffffff81442aed >> [ffff8801c1a056d0] die at ffffffff81005603 >> [ffff8801c1a05700] do_trap at ffffffff81442448 >> [ffff8801c1a05760] do_divide_error at ffffffff81002c10 >> [ffff8801c1a05888] tcp_send_dupack at ffffffff81385e44 >> [ffff8801c1a058c8] tcp_validate_incoming at ffffffff813886b5 >> [ffff8801c1a05908] tcp_rcv_state_process at ffffffff8138d0b7 >> [ffff8801c1a05958] tcp_child_process at ffffffff81397255 >> [ffff8801c1a05988] tcp_v4_do_rcv at ffffffff81395a70 >> [ffff8801c1a059d8] tcp_v4_rcv at ffffffff81396fc8 >> [ffff8801c1a05a48] ip_local_deliver_finish at ffffffff813746e9 >> [ffff8801c1a05a78] ip_local_deliver at ffffffff81374a20 >> [ffff8801c1a05aa8] ip_rcv_finish at ffffffff81374389 >> [ffff8801c1a05ad8] ip_rcv at ffffffff81374c78 >> There was a wrong ack packet coming during TCP handshake. The socket's state >> was TCP_SYN_RECV, its rcv_mss was not initialize yet. So >> tcp_send_dupack -> tcp_enter_quickack_mode got a divide 0 error. >> This patch add a state check before tcp_enter_quickack_mode. >> >> Signed-off-by: Weilong Chen <chenweil...@huawei.com> > > Can you please resubmit this, properly CC:'ing net...@vger.kernel.org this > time? > > Thank you. > > . >
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