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

On Sat, 2018-05-12 at 05:36 +0200, Cyril Brulebois wrote:
> 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:

This sounds similar to the regression seen in stable affecting gnome-
session.  libICE has a function for generating the MIT-MAGIC-COOKIE-1
cookie, which now uses libbsd's arc4random_buf() which now uses
getrandom().  getrandom() is documented to block (by default) when not
much entropy is available, but until recently it could return too early
after boot.

I don't know whether the cookie is generated this way when d-i starts
the X server.

I opened bug #898088 against libbsd because arc4random_buf() is
documented to return "very quickly".


Ben Hutchings
The most exhausting thing in life is being insincere.
                                                 - Anne Morrow Lindberg

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