Bug#910765: very slow boot with backport kernel (+workaround)

From	Yves-Alexis Perez <corsac@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#910765: very slow boot with backport kernel (+workaround)
Date	2018-10-11 10:10 +0200
Message-ID	<wHEcG-2ge-7@gated-at.bofh.it> (permalink)
References	<wHtKi-4jv-19@gated-at.bofh.it> <wHtKi-4jv-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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On Wed, 2018-10-10 at 22:49 +0200, stefano gozzi wrote:
> Debian stable (updated) with kernel 4.18.0-0.bpo.1-amd64 #1 SMP Debian
> 4.18.6-1~bpo9+1 (2018-09-13) x86_64 GNU/Linux
> 
> updating from standard kernel to backports, the boot is very slow (gdm
> login appears after ~3 minutes)

Hi,

can you confirm that reverting to 4.17 fixes the issue? It looks similar to
#910631 (except with LightDM, and I'm waiting confirmation on the kernel
involvement on that one).

LightDM seems to use /dev/urandom which shouldn't block at all, I wonder if
there's something else involved calling getrandom() without O_NONBLOCK, or if
there's indeed a regression in 4.18 rng.

Regards,
- -- 
Yves-Alexis
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Bug#910765: very slow boot with backport kernel (+workaround) stefano gozzi <stefanogozzi@gmail.com> - 2018-10-10 23:00 +0200
  Bug#910765: very slow boot with backport kernel (+workaround) Yves-Alexis Perez <corsac@debian.org> - 2018-10-11 10:10 +0200

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