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

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Date:   Tue, 24 Apr 2018 17:56:01 +0200
From:   Paul Menzel <pmenzel+linux-random-number@...gen.mpg.de>
To:     "Theodore Y. Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org
Subject: Re: Linux messages full of `random: get_random_u32 called from`

Dear Theodore,


On 04/24/18 17:49, Theodore Y. Ts'o wrote:
> On Tue, Apr 24, 2018 at 09:56:21AM -0400, 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 sytsem (what architecture, what
>> peripherals are attached, etc.)?
> 
> Can you also send me your dmesg or kern.log so I can see where
> get_random_u32 is getting called from during your system startup?

Sorry, for just attaching the unedited log file with the coreboot boot 
messages. But at time stamp 31 second (first column) the Linux messages 
are also included. An excerpt, and the full log in my last message.

> 01.515: Jumping to boot code at 00009000(7f733000)
> 31.117: [    0.515017] 00:07: ttyS1 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
> 31.118: [    0.523260] Linux agpgart interface v0.103
> 31.119: [    0.528188] i8042: PNP: PS/2 Controller [PNP0303:PS2K,PNP0f13:PS2M] at 0x60,0x64 irq 1,12
> 31.130: [    0.547244] serio: i8042 KBD port at 0x60,0x64 irq 1
> 31.130: [    0.552286] serio: i8042 AUX port at 0x60,0x64 irq 12
> 31.130: [    0.557653] rtc_cmos 00:03: RTC can wake from S4
> 31.131: [    0.562627] rtc_cmos 00:03: registered as rtc0
> 31.131: [    0.567197] rtc_cmos 00:03: alarms up to one month, y3k, 242 bytes nvram, hpet irqs
> 31.131: [    0.575045] ledtrig-cpu: registered to indicate activity on CPUs
> 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

The problem on the Lenovo X60 is, that the serial console seems to 
switch from ttyS0 to ttyS1 during bootup with the dock attached, that’s 
why you do not see the messages in the beginning.


Kind regards,

Paul


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