Arch Linux

Atari

Member

Registered: 2016-04-20

Posts: 35

uninitialized urandom read

Hello,

I've updated my VPS server after a while and now the log shows several entries such as:

kernel: random: lvm: uninitialized urandom read (4 bytes read)

Any idea what's the root cause?

full log: https://pastebin.com/VJ1m6SXY

Last edited by Atari (2019-09-24 08:57:00)

WorMzy

Administrator

From: Scotland

Registered: 2010-06-16

Posts: 12,412

Website

Re: uninitialized urandom read

Any idea what's the root cause?

lvm trying to read urandom before it's initialised. As far as log messages go, that one's pretty self-explanatory, no?

EDIT: https://wiki.archlinux.org/index.php/Ra … ev/urandom

Last edited by WorMzy (2019-09-24 09:20:24)

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Atari

Member

Registered: 2016-04-20

Posts: 35

Re: uninitialized urandom read

Hello, how can it be solved then? It has to do with the systemd dependency order for the inits?

loqs

Member

Registered: 2014-03-06

Posts: 18,055

Re: uninitialized urandom read

Options to seed the entropy pool:

• If the system uses systemd-boot that can use a random-seed to seed the entropy-pool

• haveged

• the kernel parameter random.trust_cpu=on if the CPU supports RDRAND