linux-kernel - Re: Linux 6.3-rc2

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-=wgVCTJTQPwoLrscmOa+n9X8+bc5ieCD+7PXw35Ke7i6ng@mail.gmail.com>
Date:   Mon, 13 Mar 2023 15:16:11 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 6.3-rc2

On Mon, Mar 13, 2023 at 1:30 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> It gets weird. Bisect log below. Reverting the identified patch does
> indeed seem to fix the problem, only I have no clue why this might
> be the case. The patch looks completely innocent to me. Yet, I can
> reliably reproduce the problem with v6.3-rc2, but at least so far I
> have not been able to reproduce it with commit f3dd0c53370 reverted
> (and I am trying on five different servers in parallel).

Yeah, that commit looks very innocuous. I'm surprised it would even
change any code generation, but it's very possible that it ends up
affecting some code layout or something almost by mistake.

I'd be inclined to think that the problem is very timing-sensitive,
and has probably been there for a while, and some random moon phase
just made it happen now.

               Linus