[lwip-devel] [bug #45433] Endless loop in tcp_slowtmr

[Julian Stecklina]

URL:
  <http://savannah.nongnu.org/bugs/?45433>

                 Summary: Endless loop in tcp_slowtmr
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: boelthorn
            Submitted on: Sun 28 Jun 2015 11:22:21 PM GMT
                Category: TCP
                Severity: 3 - Normal
              Item Group: Crash Error
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: git head

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Details:

I encounter an endless loop in tcp_slowtmr in the while loop that removes PCBs
that stayed long enough in TIME-WAIT (at comment /* Steps through all of the
TIME-WAIT PCBs. */ ).

In my case there is a single PCB in the list. It's next pointer points to
itself (sounds fishy) and the loop makes no progress. This situation is
somehow triggered by tcp_close().

Greg Dunn had the same problem a couple of years back, but didn't get an
answer: 
http://lwip.100.n7.nabble.com/lwip-tcp-tw-pcbs-list-problem-in-tcp-slowtmr-tt22063.html#none




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