cygwin on W7: stalled scp (openssh-6.8p1), lost ssh-scp-pipe data

Theodor.Kazhan@gmx.de Theodor.Kazhan@gmx.de
Wed Jul 1 14:44:00 GMT 2015


continued in: https://cygwin.com/ml/cygwin/2015-07/msg00009.html

-----Ursprüngliche Nachricht-----
Gesendet: Freitag, 12 Juni 2015 um 15:14:04 Uhr
Von: "Marco Atzeri" marco dot atzeri at gmail dot com
An: cygwin at cygwin dot com
Betreff: Re: cygwin on W7: stalled scp (openssh-6.8p1), lost ssh-scp-pipe data


On 6/12/2015 2:59 PM, Theodor dot Kazhan at gmx dot de wrote:
> Hi Corinna, all,
>
> in case someone is still as curious about it as I am, it took nearly one week and 3433 attempts:
>
> $  while true; do DATE=`date +%Y%m%d_%H%M%S`; echo -n "started: $DATE"; scp -v -C -o BatchMode=yes tester@10.IP2.IP3.IP4:"logDownload_m/TEST.txt" . > scp_$DATE.txt 2>&1; echo " - finished: `date +%Y%m%d_%H%M%S`"; rm -v `ls -1 scp_2015* | head -n -3`; sleep 5; done
> started: 20150605_170918 - finished: 20150605_171220
> „scp_20150603_182927.txt“ entfernt
> started: 20150605_171225 - finished: 20150605_171531
> „scp_20150603_183041.txt“ entfernt
> started: 20150605_171536 - finished: 20150605_171842
> „scp_20150603_183156.txt“ entfernt
> . . .
> started: 20150612_113735 - finished: 20150612_113845
> „scp_20150612_113347.txt“ entfernt
> started: 20150612_113850 - finished: 20150612_114003
> „scp_20150612_113502.txt“ entfernt
> started: 20150612_114009 <== this ssh-download is stalled
>
> ... to reproduce this issue one more time on my 2nd env (cygcheck attached to my previous email dated 05. June 2016, 17:00). This time, a 32k buffer (the 16k-blocks B003363 and B003364) is lost:
>
> $ sdiff -stw40 <(cat TEST.txt | sed -re "s/(B0.....-N001024-)/\1\n/g" | cut -d- -f-2) <(seq -w 1 1 94796 | sed -re "s/.*/B0&-N000001/g")
> .                   >  B003363-N000001
> .                   >  B003364-N000001
> .B094793-N000001    <
> .B094794-N000001    <
>
>
> Any advice is still highly appreciated, e.g. on howto debug into Cygwin/Win I/O-APIs, read/write functions, pipe implementation... For much more details, please refer to my previous emails.
>
>
> Thanks and BR,
> T.
>

Hi Theodor,
Question: last cygwin 2.0.4  or previous version ?

Maybe is no relevant for your case but there were some fixes

In theory during tests a 64K buffer should be faster

Regards
Marco



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