On 3/25/21 1:38 PM, Linus Torvalds wrote:

On Thu, Mar 25, 2021 at 12:34 PM Eric W. Biederman
[off-list ref] wrote:

quoted

A quick skim shows that these threads are not showing up anywhere in
proc which appears to be a problem, as it hides them from top.

Sysadmins need the ability to dig into a system and find out where all
their cpu usage or io's have gone when there is a problem.  I general I
think this argues that these threads should show up as threads of the
process so I am not even certain this is the right fix to deal with gdb.

Yeah, I do think that hiding them is the wrong model, because it also
hides them from "ps" etc, which is very wrong.

Totally agree.

I don't know what the gdb logic is, but maybe there's some other
option that makes gdb not react to them?

Guess it's time to dig out the gdb source... I'll take a look.

-- 
Jens Axboe