scdaemon lockup with Yubikey NEO

the2nd at the2nd at
Tue Dec 1 11:55:38 CET 2015

There is just one gpg-agent + scdaemon. Do you keep the first SSH 
session open when re-plugging the yubikey? If i close the first session 
do problem does not occur.

On 2015-12-01 05:16, NIIBE Yutaka wrote:
> On 12/01/2015 08:19 AM, the2nd at wrote:
>> So are any devs reading on this list? The problem is reproducible
>> and i am willing to help debugging and whatever is needed to fix the
>> issue. :)
> Yes.
> It is not reproducible for me.  I'm using OpenSSH 6.9p1.
>>> i've done some more testing and found out that the problem starts to
>>> exist with openssh version 6.8p1. With 6.7p1 everything works 
>>> perfect.
>>> I downloaded the openssh tarballs one by one, compiled with
>>> ./configure;make and just copied the "ssh" binary.
>>> I was able to reproduce the problem with the following steps:
>>> 1. Start gpg-agent: eval $(gpg-agent --daemon --enable-ssh-support
>>> --log-file ~/.gnupg/gpg-agent.log)
>>> 2. Login to any host with your SSH key and keep the session open: ssh
>>> -l root localhost
>>> 3. Plug your yubikey out/in
>>> 4. Try to login with your SSH key to any other host
> Do you have multiple gpg-agent when you encounter failure?  Or
> multiple scdaemon?

More information about the Gnupg-users mailing list