linux-kernel - Re: [PATCH 0/2] Don't show PF_IO

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAHk-=wjOXiEAjGLbn2mWRsxqpAYUPcwCj2x5WgEAh=gj+o0t4Q@mail.gmail.com>
Date:   Thu, 25 Mar 2021 12:38:54 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Jens Axboe <axboe@...nel.dk>, io-uring <io-uring@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Stefan Metzmacher <metze@...ba.org>
Subject: Re: [PATCH 0/2] Don't show PF_IO_WORKER in /proc/<pid>/task/

On Thu, Mar 25, 2021 at 12:34 PM Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>
> 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.

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

          Linus