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-next>] [day] [month] [year] [list]
Message-ID: <91194406-3fdf-4e38-9838-d334af538f74@kernel.dk>
Date: Fri, 27 Sep 2024 09:17:46 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Borislav Petkov <bp@...en8.de>
Cc: Thomas Gleixner <tglx@...utronix.de>,
 the arch/x86 maintainers <x86@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>
Subject: AMD zen microcode updates breaks boot

Hi,

Got home from conference travels and updated two test boxes to current
-git (sha 075dbe9f6e3c), both AMD boxes. One of them boots fine, the
other one does not. One is a Dell R7525, cpu:

2 socket AMD EPYC 7763 64-Core Processor

and it boots fine on -git. The other is a Dell R7625, cpu:

2 socket AMD EPYC 9754 128-Core Processor

and that one does not boot. Just get a black screen when the kernel
should load. Because I didn't have much to go on here, I bisected the
issue, and it came up with:

94838d230a6c835ced1bad06b8759e0a5f19c1d3 is the first bad commit
commit 94838d230a6c835ced1bad06b8759e0a5f19c1d3 (HEAD)
Author: Borislav Petkov <bp@...en8.de>
Date:   Thu Jul 25 13:20:37 2024 +0200

    x86/microcode/AMD: Use the family,model,stepping encoded in the patch ID

which seems plausible. And indeed, reverting that commit (and its fixup)
on top of current -git does indeed solve it. Happy to test patches,
unfortunately I don't have much to offer up in terms of oops or whatever
to help diagnose this. In lieu of instant ideas to prevent this issue on
-rc1, perhaps a revert?

-- 
Jens Axboe


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ