Re: [PATCH 0/1] printk: Yield console_sem to blocking waiters

[John Ogness]

On 2026-09-10, Aruna Ramakrishna <aruna.ramakrishna@xxxxxxxxxx> wrote:
> Problem context:
>
> After a reboot, NetworkManager failed to bring up interfaces because
> systemd was stalled, due to a flood of printk warnings.

Note that kernel warnings are considered serious and will put the CPU
into emergency state.

> Systemd was
> blocked waiting on the console lock for over 122 seconds:

Also note that the console lock is related to legacy consoles. Rather
than trying to make the legacy console trainwreck more reliable and
non-interfering, efforts should be spent converting legacy consoles to
NBCON.

What console driver are you using?

For v7.3 the 8250 driver will be NBCON.

John