linux-kernel - Re: Linux messages full of `random: get_random

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Message-ID: <156bed73-d8a6-713e-8398-4cc56531b15c@molgen.mpg.de>
Date:   Tue, 24 Apr 2018 16:30:36 +0200
From:   Paul Menzel <pmenzel+linux-random-number@...gen.mpg.de>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Linux messages full of `random: get_random_u32 called from`

Dear Theodore,


On 04/24/18 15:56, Theodore Y. Ts'o wrote:
> On Tue, Apr 24, 2018 at 01:48:16PM +0200, Paul Menzel wrote:

>> Since Linux 4.17-rcX, Linux spams a lot of `random: get_random_u32 called
>> from` messages. I believe, this setting should be reverted by default as
>> otherwise a lot of other messages are not seen.
> 
> Can you tell me a bit about your system?  What distribution, what
> hardware is present in your system (what architecture, what
> peripherals are attached, etc.)?

Good question, and sorry for not attaching the messages.

```
31.132: [    0.581736] random: get_random_u32 called from 
cache_random_seq_create+0xa3/0x1f0 with crng_init=0
31.132: [    0.590831] random: get_random_u32 called from 
cache_alloc_refill+0x5bb/0x13d0 with crng_init=0
31.132: [    0.599654] random: get_random_u32 called from 
cache_random_seq_create+0xa3/0x1f0 with crng_init=0
31.132: [    0.608722] random: get_random_u32 called from 
cache_alloc_refill+0x5bb/0x13d0 with crng_init=0
31.132: [    0.617551] random: get_random_u32 called from 
cache_random_seq_create+0xa3/0x1f0 with crng_init=0
31.132: [    0.626630] random: get_random_u32 called from 
cache_alloc_refill+0x5bb/0x13d0 with crng_init=0
31.132: [    0.635438] random: get_random_u32 called from 
cache_random_seq_create+0xa3/0x1f0 with crng_init=0
31.133: [    0.644556] input: AT Translated Set 2 keyboard as 
/devices/platform/i8042/serio0/input/input0
```

Until know I only saw this on systems where the Linux kernel was built 
for 32-bit (i386).

     make ARCH=i386 bindeb-pkg -j50

[…]

Please find the full log attached. Maybe you can reproduce it under QEMU.


Kind regards,

Paul

View attachment "seriallog-20180423_232310.log" of type "text/x-log" (198186 bytes)

Download attachment "smime.p7s" of type "application/pkcs7-signature" (5174 bytes)