Linux 6.4 has a bug where it hangs on boot, but probably only 1 in 1000 boots (and rarer if using Intel hardware for some reason).
It’s surprising to me that no one has noticed this, but I certainly did because our nbdkit tests which use libguestfs were randomly hanging, always at the same place early in booting the libguestfs qemu appliance.

The sysstat package contains various utilities, common to many commercial Unixes, to monitor system performance and usage activity:

iostat reports CPU statistics and input/output statistics for block devices and partitions.
mpstat reports individual or combined processor related statistics.
pidstat reports statistics for Linux tasks (processes) : I/O, CPU, memory, etc.
tapestat reports statistics for tape drives connected to the system.
cifsiostat reports CIFS statistics.

Un excellent article sur la génération de nombre aléatoire dans le noyaux linux.

Une nouvelle fournée de faille trouvées grâce à un fuzzer.

Un guide sur le réseau sous Linux. Le dernier commit remonte à 2012 mais ça reste quand même toujours très utile.