Re: GDB BoF notes - GNU Cauldron 2023

Pedro Alves
2023-09-29T09:58:13Z

On 2023-09-27 21:27, John Baldwin wrote:

> +1 to both of these.  One caveat about the pagination case is that I
> use custom commands that can sometimes generate a lot of output (e.g.
> walking linked-lists in a kernel crash image outputting info about
> each entry, or similar things for entries in descriptor rings).  If one
> of these scripts has a bug that causes an infinite loop, the pager
> seems to be the only way to stop the command.  In particular, Ctrl-C
> doesn't work in my experience to cancel a user command stuck in an
> infinite loop.  It might be nice to ensure that Ctrl-C can cancel both
> user and builtin commands that are either stuck or generating reams of
> output.
>

I'm surprised to hear this, as it's already supposed to be possible to
Ctrl-C in those cases. But I won't be surprised if there's some bug
swallowing Ctrl-C somewhere. I do recall that Kevin fixed a good number
of them for the SIGTERM propagation patches. It may also be that it's the
user command that is buggy -- e.g., if it's a python command and then the
command swallows the keyboard interrupt exceptions.