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Message-ID: <c852f06e-fde6-41dc-95d9-e0081d5c995e@emrich-ebersheim.de>
Date: Mon, 17 Feb 2025 12:51:41 +0100
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Subject: Re: [CALL FOR TESTING] Cygwin-3.6.0
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Precedence: list
From: Rainer Emrich via Cygwin <cygwin AT cygwin DOT com>
Reply-To: rainer-lists AT emrich-ebersheim DOT de
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Errors-To: cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Hi Corinna,

Am 14.02.2025 um 20:03 schrieb Corinna Vinschen via Cygwin-announce:
> we're planning the next major release in the next few (hopefully
> not more than two) weeks.
>
> We're looking forward to more people giving the latest test release
> of Cygwin a try!
>
> The most recent test release, which you can easily install from Cygwin
> Setup, is cygwin-3.6.0-0.374.g4dd859d01c22.  Of course, as time goes by,
> there may be more 3.6.0 test release prior to the official release.
>
> If you're unsure how to install a test release, please have a look
> at https://cygwin.com/faq.html#faq.setup.testrels
>
> At this point, we're most interested if the test release introduces
> regressions compared to 3.5.7!
>
> There's a whole bunch of new features and a few behavioral changes
> compared to 3.5, but it's not so much testing the new functionality
> we're after, but to test if everything still runs as in 3.5.7 or
> even... better!
>
> If you see a change in the test release which breaks something for
> you running fine in 3.5.7, please send a mail, ideally with a short
> and simple testcase, to the cygwin AT cygwin DOT com mailing list.

I'm facing a strange major issue with scp. The issue exists in all cygwin version later than 3.5.3,
including cygwin-3.6.0-0.374.g4dd859d01c22.

If I'm copying a large file with scp I get a "connection lost" after a random couple of seconds:

scp -v large_file foobar:
.
.
debug1: Sending subsystem: sftp
debug1: pledge: fork
large_file                                             10%   71MB   4.3MB/s   02:21 ETA
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow AT openssh DOT com reply 0
debug1: channel 0: free: client-session, nchannels 1
Transferred: sent 92266460, received 35436 bytes, in 15.3 seconds
Bytes per second: sent 6035219.0, received 2317.9
debug1: Exit status 11
lost connection

This is reproducable.


The strange thing, if I use strace to debug this, the cpoy succeeds:
strace -efno strace.log scp -v large_file foobar:
.
.
debug1: Sending subsystem: sftp
debug1: pledge: fork
large_file                                                                                                                                                                                        100%  678MB   6.0MB/s   01:53
scp: debug1: truncating at 711258712
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: channel 0: free: client-session, nchannels 1
Transferred: sent 711773996, received 254484 bytes, in 114.1 seconds
Bytes per second: sent 6237052.6, received 2230.0
debug1: Exit status 0

And this is reproducable too.

I would try to debug this further, if I had an idea how to do that.

Any thoughts?

Regards

Rainer


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