[lwip-devel] [bug #34517] persist timer is started although no zero window is received

[Joel Cunningham]

Follow-up Comment #8, bug #34517 (project lwip):

Simon,

What is the bug you reference which handles the case where LwIP treats a
non-zero window less than 1 MSS as a zero window?

I'm running into this issue currently with the git master branch.  

What I'm seeing is where the receiver's window is less than 1 MSS but the next
packet on the unsent queue is 1 MSS, so LwIP stops sending.  Then the window
update from the receiver is dropped (verified update is sent in wireshark, but
tcphdr in tcp_in.c only shows the previous ACK with < 1 MSS window).

Since the zero window timer isn't running and there are no segments on the
unacked queue, LwIP doesn't send anything and the connection deadlocks

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