https://issues.apache.org/bugzilla/show_bug.cgi?id=50807

--- Comment #10 from Orion Poplawski <[email protected]> ---
Adam's not in comment #5 applies to just standard systems as well where the
net.ipv4.tcp_fin_timeout defaults to 60 seconds.  So when apache tries to send
the final FIN, we get a flood of FIN and RST packets due to tcp retransmission:

 29 5.076937000   BACKEND -> PROXY  TCP 66 8141 > 59404 [FIN, ACK] Seq=7266
Ack=2506 Win=35968 Len=0 TSval=372987155 TSecr=373232386
 30 5.116993000  PROXY -> BACKEND   TCP 66 59404 > 8141 [ACK] Seq=2506 Ack=7267
Win=32000 Len=0 TSval=373237391 TSecr=372987155
616 168.070814000  PROXY -> BACKEND   TCP 66 59404 > 8141 [FIN, ACK] Seq=2506
Ack=7267 Win=32000 Len=0 TSval=373400344 TSecr=372987155
617 168.070868000   BACKEND -> PROXY  TCP 54 8141 > 59404 [RST] Seq=7267 Win=0
Len=0
632 168.274981000  PROXY -> BACKEND   TCP 66 [TCP Retransmission] 59404 > 8141
[FIN, ACK] Seq=2506 Ack=7267 Win=32000 Len=0 TSval=373400549 TSecr=372987155
633 168.275009000   BACKEND -> PROXY  TCP 54 8141 > 59404 [RST] Seq=7267 Win=0
Len=0
634 168.685140000  PROXY -> BACKEND   TCP 66 [TCP Retransmission] 59404 > 8141
[FIN, ACK] Seq=2506 Ack=7267 Win=32000 Len=0 TSval=373400959 TSecr=372987155
635 168.685196000   BACKEND -> PROXY  TCP 54 8141 > 59404 [RST] Seq=7267 Win=0
Len=0
636 169.504941000  PROXY -> BACKEND   TCP 66 [TCP Retransmission] 59404 > 8141
[FIN, ACK] Seq=2506 Ack=7267 Win=32000 Len=0 TSval=373401779 TSecr=372987155
637 169.504968000   BACKEND -> PROXY  TCP 54 8141 > 59404 [RST] Seq=7267 Win=0
Len=0
640 171.144951000  PROXY -> BACKEND   TCP 66 [TCP Retransmission] 59404 > 8141
[FIN, ACK] Seq=2506 Ack=7267 Win=32000 Len=0 TSval=373403419 TSecr=372987155
641 171.144982000   BACKEND -> PROXY  TCP 54 8141 > 59404 [RST] Seq=7267 Win=0
Len=0
644 174.454315000  PROXY -> BACKEND   TCP 66 [TCP Retransmission] 59404 > 8141
[FIN, ACK] Seq=2506 Ack=7267 Win=32000 Len=0 TSval=373406728 TSecr=372987155
645 174.454348000   BACKEND -> PROXY  TCP 54 8141 > 59404 [RST] Seq=7267 Win=0
Len=0
673 181.013929000  PROXY -> BACKEND   TCP 66 [TCP Retransmission] 59404 > 8141
[FIN, ACK] Seq=2506 Ack=7267 Win=32000 Len=0 TSval=373413288 TSecr=372987155
674 181.013955000   BACKEND -> PROXY  TCP 54 8141 > 59404 [RST] Seq=7267 Win=0
Len=0
732 194.133990000  PROXY -> BACKEND   TCP 66 [TCP Retransmission] 59404 > 8141
[FIN, ACK] Seq=2506 Ack=7267 Win=32000 Len=0 TSval=373426408 TSecr=372987155
733 194.134013000   BACKEND -> PROXY  TCP 54 8141 > 59404 [RST] Seq=7267 Win=0
Len=0
877 220.374086000  PROXY -> BACKEND   TCP 66 [TCP Retransmission] 59404 > 8141
[FIN, ACK] Seq=2506 Ack=7267 Win=32000 Len=0 TSval=373452648 TSecr=372987155
878 220.374149000   BACKEND -> PROXY  TCP 54 8141 > 59404 [RST] Seq=7267 Win=0
Len=0

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