We are having the same problem as described already here
but we can’t reply anymore to the thread and the fix mentioned is already in place as we checked.
The problem occurred now after the lest update of linux kernel yesterday.
We are actually running all sites since months already on PHP FPM 7.4 and never changed it but I received an error from composer - so I checked - and realized that the PHP Version can’t be changed because of that error appearing
Ubuntu 20.04:
OS version: