Bug#898814: When I log in, it hangs until crng init done
On Fri, 14 Dec 2018 11:04:40 +0100 Yves-Alexis Perez <corsac@debian.org> wrote:
> On Fri, 2018-12-14 at 10:24 +0100, Yves-Alexis Perez wrote:
> > Something puzzles me with all those issues: as far as I can tell, on most
> > install, systemd-random-seed.service should save a seed at shutdown and
> > restore it at startup, and this (I think) should be enough to properly init
> > the RNG.
> >
> > Can you check if the service has been run in your case?
>
> Hi again,
>
> actually don't bother, I was pointed to [1] which has explanations. The random
> seed load is done by just writing to /dev/urandom which doesn't credit
> entropy [2].
Hi,
That service appears to be running normal on the machine with this
bug. As you said, it cannot be the cause.
> I don't have good solutions right now. With 4.19 and if your CPU has an RNG
> you're willing to trust, you'll be able to pass random.trust_cpu=yes to the
> kernel command line, which should help seeding the RNG.
The CPU on the machine with the bug does have an hardware RNG. I will
test this option once I have linux-image-amd64 4.19 installed.
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