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cygwin64 OpenSSH_8.1p1 client segmentation fault


Hi,

I have recently upgraded Cygwin packages. After the upgrade ssh client stopped working.
It connects and logins using ssh keys as normal, but then the connection is immediately dropped (ssh client process dies and segfaults under strace).
This is definitely not the server side issue as I have an old cygwin32 version (on the same PC) where ssh client logins to the same server with the same ssh-keys just fine.
I am also able to connect using putty with same ssh-keys.

I was trying to rollback my installation of Cygwin, but unfortunately setup-x86_64.exe does not offer this possibility.
Please help me rolling back to some version of Cygwin where ssh client is working.
I tried all 3 versions of ssh and ssl that are available. Tried re-installing OpenSSH and OpenSSL packages, but nothing helps.

This 64-bit latest version is not working:
$ ssh -V
OpenSSH_8.1p1, OpenSSL 1.1.1d  10 Sep 2019

This is working 32bit version:
$ ssh -V
OpenSSH_6.1p1, OpenSSL 1.0.1e 11 Feb 2013

ssh session logs attached:

ssh-session-1.log - connection to host in known_hosts - without questions, login is ok, then immediate disconnect.

ssh-session-1.vvv.log - same but ssh -vvv option used

ssh-session-1-strace.log - same under strace

ssh-V.strace.log - running ssh -V and strace ssh -V (which also crashes)

see also cygcheck.out

thanks in advance for any help,
Vadim Goryunov

Attachment: ssh-session-1.log
Description: Text document

Attachment: cygcheck.out
Description: Binary data

Attachment: ssh-session-1.vvv.log
Description: Text document

Attachment: ssh-session-1-strace.log
Description: Text document

Attachment: ssh-V.strace.log
Description: Text document

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