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Subject: Re: Linux messages full of `random: get_random_u32 called from`
To:     "Theodore Y. Ts'o" <tytso@mit.edu>, linux-kernel@vger.kernel.org
References: <42c1b84b-ab1f-5577-6304-e0985a637cf9@molgen.mpg.de>
 <20180424135621.GD4189@thunk.org> <20180424154904.GC30619@thunk.org>
From:   Paul Menzel <pmenzel+linux-random-number@molgen.mpg.de>
Message-ID: <d251173a-d7c0-3f55-7c22-a100f6093176@molgen.mpg.de>
Date:   Tue, 24 Apr 2018 17:56:01 +0200
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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 ca=
lled
>>> 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.)?
>=20
> 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=20
messages. But at time stamp 31 second (first column) the Linux messages=20
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 =3D 4, base_baud =
=3D 115200) is a 16550A
> 31.118: [    0.523260] Linux agpgart interface v0.103
> 31.119: [    0.528188] i8042: PNP: PS/2 Controller [PNP0303:PS2K,PNP0f1=
3: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=3D0
> 31.132: [    0.590831] random: get_random_u32 called from cache_alloc_r=
efill+0x5bb/0x13d0 with crng_init=3D0
> 31.132: [    0.599654] random: get_random_u32 called from cache_random_=
seq_create+0xa3/0x1f0 with crng_init=3D0
> 31.132: [    0.608722] random: get_random_u32 called from cache_alloc_r=
efill+0x5bb/0x13d0 with crng_init=3D0
> 31.132: [    0.617551] random: get_random_u32 called from cache_random_=
seq_create+0xa3/0x1f0 with crng_init=3D0
> 31.132: [    0.626630] random: get_random_u32 called from cache_alloc_r=
efill+0x5bb/0x13d0 with crng_init=3D0
> 31.132: [    0.635438] random: get_random_u32 called from cache_random_=
seq_create+0xa3/0x1f0 with crng_init=3D0
> 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=20
switch from ttyS0 to ttyS1 during bootup with the dock attached, that=E2=80=
=99s=20
why you do not see the messages in the beginning.


Kind regards,

Paul


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