Hi Rainer, On Feb 17 12:51, Rainer Emrich via Cygwin wrote: > 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. > > [...] > > At this point, we're most interested if the test release introduces > > regressions compared to 3.5.7! > > [...] > > 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 e...@openssh.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
In fact, I can reproduce this occassionally back to 3.5.0 and back to OpenSSH 9.7p1. We can't easily try this with older Cygwin versions. It's getting increasingly hard to build older Cygwin versions due to compiler dependencies and missing symbols. What that means in the first place, is that this is neither a regression from 3.5.7, nor even from 3.5.1. Obviously I can't prove if this has been introduced into 3.5.0, but I'd like to point out that we didn't have any noticable change in the socket code for almost 4 years, back during 3.3 development. Fun fact: I can NOT reproduce the problem when using the -O option, i. e., when using the old scp protocol. The old protocol isn't slower either. Maybe that's a workaround for you? > The strange thing, if I use strace to debug this, the cpoy succeeds: > strace -efno strace.log scp -v large_file foobar: This often points to a timing issue, but beats me where that could be. > I would try to debug this further, if I had an idea how to do that. Same here ATM, sorry. Corinna -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
