Package: gnome-shell
Version: 3.14.4-1~deb8u1
Severity: important

On one particular system, I've observed there is always a delay of about
20 seconds to unlock the screen.  The logs don't contain any warning or
explanation.

The delay occurs after typing the password and pressing enter.

Two lines are logged in auth.log immediately after pressing enter:

gdm-password]: pam_krb5(gdm-password:auth): user daniel authenticated as
daniel@REALM
gdm-password]: gkr-pam: unlocked login keyring


Then I wait and eventually the desktop appears.  No further log entries
appear in any /var/log/* during or after the delay.

These are the libpam packages on the system:

libpam-ck-connector:amd64 0.4.6-5
libpam-gnome-keyring 3.14.0-1+b1
libpam-krb5:amd64 4.6-3+b1
libpam-modules:amd64 1.1.8-3.1+deb8u1+b1
libpam-modules-bin 1.1.8-3.1+deb8u1+b1
libpam-runtime 1.1.8-3.1+deb8u1
libpam-systemd:amd64 215-17+deb8u4
libpam0g:amd64 1.1.8-3.1+deb8u1+b1
libpam0g-dev:amd64 1.1.8-3.1+deb8u1+b1

I notice the CPU usage of the gnome-shell process rises briefly during
the delay, momentarily reaching 20% and going back down again.

Are there any other log files created by gnome-shell?  Is there any
other debugging I should enable to identify the root cause of this issue?

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