linux-kernel - Re: [bp@....ch: Bug#1111455: linux-image-6.12.41+deb13-amd64: kernel BUG at fs/netfs/read_collect.c:316 netfs: Can't donate prior to front]

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Message-ID: <20250818151814.18d5dcd4@go.imp.ch>
Date: Mon, 18 Aug 2025 15:18:14 +0200
From: Benoit Panizzon <benoit.panizzon@....ch>
To: Salvatore Bonaccorso <carnil@...ian.org>
Cc: Max Kellermann <max.kellermann@...os.com>,
        David Howells
 <dhowells@...hat.com>,
        Paulo Alcantara <pc@...guebit.org>, netfs@...ts.linux.dev,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Benoit Panizzon <bp@....ch>, 1111455@...s.debian.org,
        stable@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: [bp@....ch: Bug#1111455: linux-image-6.12.41+deb13-amd64:
 kernel BUG at fs/netfs/read_collect.c:316 netfs: Can't donate prior to
 front]

Hi Salvatore

> A user in Debian reported the following kernel oops when running on
> 6.12.41 (but apparently as well on older versions, though there were
> several netfs related similar issues, so including Max Kellermann as
> well in the recipients)

Thanks for looking into this issue. 6.1 from bookworm did not crash
since this morning.

Installed 6.16 from debian experimental - just the linux-image package.

Linux go 6.16-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.16.1-1~exp1 (2025-08-16) x86_64 GNU/Linux

Running cachefilesd, /home on NFS

25 minutes uptime. 6.12 would for have oopsed before. Mostly in the
first 5 minutes.

I have upgraded several machines from Bookworm to Trixie - some make
use of NFS but none as heavily as my office workstation with /home on
NFS. All the other machines are either on ARM or INTEL metal or
virtualised KVM machines. Not seen that issue on those other machines.

I suspect it could be a problem affecting only that specific CPU indeed
hitting an invalid opcode.

vendor_id	: AuthenticAMD
cpu family	: 25
model		: 80
model name	: AMD Ryzen 7 PRO 5750GE with Radeon Graphics
stepping	: 0
microcode	: 0xa500011

Mit freundlichen Grüssen

-Benoît Panizzon-
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