netdev - Re: net: dsa: realtek: silent indirect reg read failures on SMP

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: <CAJq09z6W+yYAaDcNC1BQEYKdQUuHvp4=vmhyW0hqbbQUzo516w@mail.gmail.com>
Date:   Thu, 10 Feb 2022 00:10:23 -0300
From:   Luiz Angelo Daros de Luca <luizluca@...il.com>
To:     Alvin Šipraga <ALSI@...g-olufsen.dk>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Arınç ÜNAL <arinc.unal@...nc9.com>
Subject: Re: net: dsa: realtek: silent indirect reg read failures on SMP

> > So I used this command:
> >
> >     while true; do phytool read swp2/2/0x01; sleep 0.1; done
>
> I'll test it and report.

In my single processor device, I got stable readings:

root@...nWrt:/# while true; do phytool read lan1/2/0x01; done | time awk '!a[$1]
++'
0x79c9
^CCommand terminated by signal 2
real    4m 56.44s
user    0m 1.61s
sys     0m 0.72s

And most of the time I was executing three copies of that loop in parallel.
I tried with and without my patches. All of them resulted in the same behavior.

Sorry but I believe my non-SMP device is not "affected enough" to help
debug this issue. Is your device SMP?

---
Luiz