sudo not available after configuring ipmi serial over lan

[Eugene Grosbein]

09.11.2018 3:26, Eric Borisch wrote:

> What I find interesting is that with the 'wrong' setting, you can log still
> in just fine, and run most commands, but 'sudo' alone fails as described
> above. (I've had the same experience on Serial-over-IPMI, but 'su' worked
> fine so I never dug into it.)
> 
> It's an easy fix, but I'm still (academically) interested in what it is
> that sudo is doing that is unique.

It calls syslog() function with parameters that (for default /etc/ttys and /etc/syslog.conf)
makes an attempt to write to the console that blocks.

You can easily verify this using "ktrace -i sudo ..." and "kdump" after.