Problem understood (sort of) but not solved. @Paul, you were right, it
is related to TIME_WAIT but in a bizarre wait. Consider the following
TCP dumps
Code:
--------------------
success
3684 381.383533 192.168.6.15 192.168.6.194 TCP 54 [TCP
Retransmission] 9000 → 52422 [FIN, ACK] Seq=9305427 Ack=54 Win=262656
Len=0
3685 381.387417 192.168.6.194 192.168.6.15 TCP 60 52422
→ 9000 [ACK] Seq=54 Ack=9305428 Win=131328 Len=0
3686 381.387417 192.168.6.194 192.168.6.15 TCP 60 52422
→ 9000 [FIN, ACK] Seq=54 Ack=9305428 Win=131328 Len=0
3687 381.387526 192.168.6.15 192.168.6.194 TCP 54 9000
→ 52422 [ACK] Seq=9305428 Ack=55 Win=262656 Len=0
failed
5375 508.721495 192.168.6.15 192.168.6.194 TCP 54 [TCP
Retransmission] 9000 → 52436 [FIN, ACK] Seq=5584802 Ack=54 Win=262656
Len=0
5376 508.724054 192.168.6.194 192.168.6.15 TCP 60 52436
→ 9000 [ACK] Seq=54 Ack=5584803 Win=961024 Len=0
6039 628.728483 192.168.6.15 192.168.6.194 TCP 54 9000
→ 52436 [RST, ACK] Seq=5584803 Ack=54 Win=0 Len=0
--------------------
In both cases, the whole file has been sent to the Bridge and LMS sends
a FIN,ACK but in the successful case, the Bridge answers with a FIN,ACK
wand all ends normally. In the failed case, although the bridge asnwers
with an ACK to the last segment, the FIN never arrives and 120s later,
LMS uses a RST.
Now, my understanding is that I get kind of unlucky because what happens
is that all is well received by the TCP layer, including the FIN, but
for a graceful shutdown, the application layer should call close() so
that the FIN,ACK can be sent in response. But because the application
layer is blocked, it does not call close() and have a TIME_WAIT
expiration instead. When finally the application layer (the streaming
thread) runs, it's too late and recv() return <0 because of the RST and
last segments in kernel buffers are lost.
Crap, crap and crap
LMS 8.2 on Odroid-C4 - *SqueezeAMP!*, 5xRadio, 5xBoom, 2xDuet, 1xTouch,
1xSB3. Sonos PLAY:3, PLAY:5, Marantz NR1603, Foobar2000, ShairPortW,
2xChromecast Audio, Chromecast v1 and v2, Squeezelite on Pi, Yamaha
WX-010, AppleTV 4, Airport Express, GGMM E5, RivaArena 1 & 3
------------------------------------------------------------------------
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