Am Freitag, 21. Juli 2023, 14:28:29 CEST schrieb Stefan Wahren:
Hi Stefan,
sorry for the delay.
> Hi,
>
> i recently tested Linux 6.5-rc2 on the Raspberry Pi 4 (arm64/defconfig)
> and noticed the following message:
>
> [ 0.136349] jitterentropy: Initialization failed with host not
> compliant with requirements: 9
>
> Since Linux 6.5-rc2 this message occurs in around about 1 of 2 cases
> during boot. In Linux 6.4 this message i never saw this message.
This system has not that much entropy. A short-term fix would be to set the
oversampling rate to a higher value than 1, the current value.
See jent_entropy_collector_alloc:
/* verify and set the oversampling rate */
if (osr == 0)
osr = 1; /* minimum sampling rate is 1 */
The osr could be set to 3, for example. This makes the Jitter RNG slower, but
it can now handle lower-entropy environments.
Let me see how this can be fixed.
Thanks for the report.
Ciao
Stephan
