Comment 4 for bug 1938013

Probably same here.

Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz
Ubuntu 18 on T540p
FDE enabled
previous kernel was -147, issues starting happening with -151

cat /var/log/apt/history.log | grep -B 3 -A 3 "linux-image-4.15.0-151"

Start-Date: 2021-07-22 08:30:19
Commandline: /usr/bin/unattended-upgrade
Install: linux-headers-4.15.0-151-generic:amd64 (4.15.0-151.157, automatic), linux-modules-4.15.0-151-generic:amd64 (4.15.0-151.157, automatic), linux-image-4.15.0-151-generic:amd64 (4.15.0-151.157, automatic), linux-modules-extra-4.15.0-151-generic:amd64 (4.15.0-151.157, automatic), linux-headers-4.15.0-151:amd64 (4.15.0-151.157, automatic)
Upgrade: linux-headers-generic:amd64 (4.15.0.147.134, 4.15.0.151.139), linux-image-generic:amd64 (4.15.0.147.134, 4.15.0.151.139), linux-generic:amd64 (4.15.0.147.134, 4.15.0.151.139)
End-Date: 2021-07-22 08:31:39

Since then wifi (ipv6) also produced freezes. I had to disable the ipv6 module in grub and then I had no more freezes when the wifi reconnected or if I manually connected to it. But still there were freezes / crashes and in syslog there were only a few of these rss error entries.

/var/crash contains dumps from the timestamps, when the latest freezes happened today so it seems to be definitely caused by the kernel

the freezes and crashes can also lead to other symptoms like a broken filesystem in some cases

ps: adding special characters in the comment textarea causes a server error here (UnicodeEncodeError) for example the symbol from the fish shell