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Bug#898468: debian-installer: black screen/long delay in graphical installer after switching from linux 4.15 to 4.16

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  Bug#898468: debian-installer: black screen/long delay in graphical installer after switching from linux 4.15 to 4.16 Cyril Brulebois <kibi@debian.org> - 2018-05-12 05:40 +0200

#60978 — Bug#898468: debian-installer: black screen/long delay in graphical installer after switching from linux 4.15 to 4.16

Package: debian-installer
Severity: serious
Justification: graphical installer regression

Hi,

Ever since we switched from linux 4.15 to 4.16, the graphical installer
gets a black screen. Comparing Xorg logs, everything is exactly the same
except for the kernel version and timestamps. syslog has extra lines
about random stuff:

    May 12 02:25:01 init: starting pid 169, tty '': '/sbin/reopen-console /sbin/debian-installer'
    May 12 02:25:01 init: starting pid 172, tty '/dev/tty4': '/usr/bin/tail -f /var/log/syslog'
    May 12 02:25:02 init: process '/sbin/reopen-console /sbin/debian-installer' (pid 169) exited. Scheduling for restart.
    May 12 02:25:02 init: starting pid 201, tty '': '/sbin/reopen-console /sbin/debian-installer'
    May 12 02:25:02 kernel: [    3.302164] random: debconf: uninitialized urandom read (8 bytes read)
    May 12 02:25:02 kernel: [    3.302291] random: debconf: uninitialized urandom read (8 bytes read)
    May 12 02:25:02 kernel: [    3.302351] random: debconf: uninitialized urandom read (8 bytes read)
    May 12 02:25:02 kernel: [    3.302450] random: debconf: uninitialized urandom read (8 bytes read)
    May 12 02:25:02 kernel: [    3.302530] random: debconf: uninitialized urandom read (8 bytes read)
    May 12 02:25:02 kernel: [    3.302682] random: debconf: uninitialized urandom read (8 bytes read)
    May 12 02:25:02 kernel: [    3.302804] random: debconf: uninitialized urandom read (8 bytes read)
    May 12 02:25:02 kernel: [    3.302963] random: debconf: uninitialized urandom read (8 bytes read)
    May 12 02:25:02 kernel: [    3.303009] random: debconf: uninitialized urandom read (8 bytes read)
    May 12 02:25:02 kernel: [    3.303078] random: debconf: uninitialized urandom read (8 bytes read)

                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    May 12 02:25:19 init: starting pid 170, tty '/dev/tty2': '-/bin/sh'
    May 12 02:25:21 debconf: Setting debconf/language to en
    May 12 02:25:21 main-menu[229]: DEBUG: resolver (libgcc1): package doesn't exist (ignored)
    May 12 02:25:21 main-menu[229]: INFO: Falling back to the package description for brltty-udeb
    May 12 02:25:21 main-menu[229]: INFO: Menu item 'localechooser' selected
    May 12 02:25:22 debconf: Setting debconf/language to en
    May 12 02:25:22 gtk-set-font: Switching to font 'DejaVu Sans' for 'en'
    May 12 02:25:24 kernel: [   25.303708] random: crng init done

After a while, this happens:               ^^^^^^^^^^^^^^^^^^^^^^

Once that has happened (so after 20+ seconds), the screen comes up
properly without any intervention. I think I've seen reports on
#debian-kernel about boot stuff like plymouth/cryptsetup having issues
gathering entropy at the early stages of the boot sequence, but I'm not
sure that's a regression in the kernel, and/or something that should be
dealt with from within cdebconf.

That's why I'm filing this bug report for the time being, feel free to
mention actual bug reports on the kernel side, and to suggest ways to go
from here (I haven't followed that quite closely).

I've X-D-Cc'd debian-kernel@ as their input is more than welcome.

Interestingly, the text installer is working just fine so I guess it's
something frontend-specific (some X11 fun?), but I won't dig into that
right away.


Cheers,
-- 
Cyril Brulebois (kibi@debian.org)            <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant

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