Dear Maintainer, I've noticed in Munin graphs that entropy dropped significantly after reboot to 5.10.120-1. Please see images attached. Not sure if this is actually a problem/bug, but that kind of drop "out of nowhere" seems at least suspicious. I see same level of entropy on multiple 5.10 machines, though on one computers I use backported 5.16.12-1~bpo11+1 (due to issues with i7-11700 graphics) and it's entropy looks rich: ``` $ cat /proc/sys/kernel/random/entropy_avail 3735 ```
https://forum.openwrt.org/t/low-entropy-22-03-snapshot-change-in-kernel-entropy-pool-logic/129573 When I saw that, I check my entropy level and that was 256 too. I *think* it's intentional; various commits in 'crypto' also in 5.10.y branch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/log/crypto?h=linux-5.10.y
The most visible aspect of this, and the likely reason for several bug reports, is that the size of the entropy pool went down from ~3000+ to 256. This is an intentional upstream change and NOT a bug in the Debian kernel. The 'wontfix' tag is therefor added to this bug (and therefor merged bugs). These changes have also been backported to other LTS kernels, including the 5.10 kernel used in Debian Bullseye. Almost the whole upstream 5.10.119 release consist of these changes. There have been extensive commit messages, so next to the above referenced document, ``git log v5.10.118..v5.10.119`` should give you (more) details.