[pkg-gnupg-maint] Bug#840680: dirmngr: Dirmngr not always responding

[Shengjing Zhu]

Package: dirmngr
Version: 2.1.15-4
Severity: grave
Justification: renders package unusable

Dear Maintainer,

After upgrade to 2.1.15-4, I find dirmngr is not always responding
which makes command like `gpg --refresh-keys` stuck.

I test dirmngr with the following steps:

First run `gpg-connect-agent --dirmngr /bye`
It should immediately return but it's stuck.

But I open another shell to run `gpg-connect-agent --dirmngr /bye`
again. The first gpg-connect-agent returns and the second still is
stuck.

And I run again `gpg-connect-agent` and the previous one returns.

So I guess only another process access to the dirmngr socket, the
previous connect will be got processed.

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages dirmngr depends on:
ii  adduser        3.115
ii  libassuan0     2.4.3-1
ii  libc6          2.24-3
ii  libgcrypt20    1.7.3-1
ii  libgnutls30    3.5.4-2
ii  libgpg-error0  1.24-1
ii  libksba8       1.3.5-2
ii  libldap-2.4-2  2.4.42+dfsg-2+b3
ii  libnpth0       1.2-3
ii  lsb-base       9.20160629

Versions of packages dirmngr recommends:
ii  gnupg  2.1.15-4

Versions of packages dirmngr suggests:
pn  tor  <none>

-- no debconf information
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