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Re: lightdm (testing): Long waiting time after login

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On 16/05/18 19:28, work@hllmnn.de wrote:
> I just did a fresh install of testing with XFCE. After entering the login
> credentials the screen was black for 30-60 seconds before the desktop
> environment showed up. Assuming a bug in XFCE, I performed another fresh install
> with MATE, but a similar effect occured: after login the background image is
> shown for 30-60 seconds before the desktop is fully loaded.

What happens if you wiggle your mouse or provide keyboard activity while 
waiting? For example, if you wiggle your mouse vigorously for two 
seconds or press the Alt key 20 times? Does the wait end sooner?

In Linux 4.16, the getrandom system call (without the GRND_NONBLOCK 
flag) blocks until sufficient entropy is available in the pool. This is 
the documented behaviour, and Linux 4.16 now enforces it to fix 
CVE-2018-1108. This has caught out several services that try to use 
getrandom (without the GRND_NONBLOCK flag) at early boot, including 
plymouth (via fontconfig) and gdm3. What you see might have the same 
cause. For details of my investigation, see:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=897572

Wiggling your mouse or providing keyboard activity adds entropy to the 
pool. If this reduces the waiting time, you might be affected by the 
same bug.

Kind regards,

-- 
Ben Caradoc-Davies <ben@transient.nz>
Director
Transient Software Limited <https://transient.nz/>
New Zealand

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Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-17 00:50 +0200
  Re: lightdm (testing): Long waiting time after login Dino <work@hllmnn.de> - 2018-05-17 11:10 +0200
    Re: lightdm (testing): Long waiting time after login Curt <curty@free.fr> - 2018-05-17 12:10 +0200
    Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-18 01:10 +0200
      Re: lightdm (testing): Long waiting time after login Dino <work@hllmnn.de> - 2018-05-18 08:50 +0200
        Re: lightdm (testing): Long waiting time after login songbird <songbird@anthive.com> - 2018-05-18 12:10 +0200
          Re: lightdm (testing): Long waiting time after login Dino <work@hllmnn.de> - 2018-05-18 16:00 +0200
            Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-19 00:10 +0200
              Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-19 01:30 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-19 03:10 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-21 05:30 +0200
                Re: lightdm (testing): Long waiting time after login Dino <work@hllmnn.de> - 2018-05-22 10:00 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-23 00:50 +0200
                Re: lightdm (testing): Long waiting time after login Glenn English <ghe2001@gmail.com> - 2018-05-23 18:50 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-24 00:20 +0200
                Re: lightdm (testing): Long waiting time after login Glenn English <ghe2001@gmail.com> - 2018-05-24 15:50 +0200
                Re: lightdm (testing): Long waiting time after login Ben Caradoc-Davies <ben@transient.nz> - 2018-05-25 00:30 +0200

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