[lwip-devel] [bug #27140] tcp/ip stack hang becouse remains a pbuf_free

[Kieran Mansley]

Update of bug #27140 (project lwip):

             Assigned to: <strong>Invalid User ID</strong> => None           
       

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Follow-up Comment #3:

netconn_write doesn't allocate a pbuf.  

The data to write it passed through the message box to the raw API which will
call do_write()->do_writemore()->tcp_write()->tcp_enqueue() and this will then
create a pbuf if there is space to enqueue the packet. There are a few reasons
why it might not get this far, so make sure that netconn_write isn't returning
an error.

If you're sure it's getting enqueued, then the pbuf would normally be freed
by the stack once the packet has been acknowledged by the other end - see the
call to tcp_seg_free() in tcp_receive().  If you're not getting this
acknowledgement, that could explain why the pbuf is not freed.  

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