linux-kernel - Re: [PATCH] PCI: dpc: Increase pciehp waiting time for DPC recovery

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Message-ID: <aXydEn_lAbNROQKy@wunner.de>
Date: Fri, 30 Jan 2026 12:59:14 +0100
From: Lukas Wunner <lukas@...ner.de>
To: LeoLiu-oc <LeoLiu-oc@...oxin.com>
Cc: Bjorn Helgaas <helgaas@...nel.org>, mahesh@...ux.ibm.com,
	oohall@...il.com, bhelgaas@...gle.com,
	linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, CobeChen@...oxin.com,
	TonyWWang@...oxin.com, ErosZhang@...oxin.com
Subject: Re: [PATCH] PCI: dpc: Increase pciehp waiting time for DPC recovery

On Wed, Jan 28, 2026 at 06:07:51PM +0800, LeoLiu-oc wrote:
> Without this patch, PCIE devices may not be usable and could even cause
> more serious errors, such as a kernel panic. For example, the following
> log is encountered in hardware testing:
> 
> list_del corruption, ffff8881418b79e8->next is LIST_POISON1
> (dead000000000100)
> ------------[ cut here ]------------
> kernel BUG at lib/list_debug.c:56!
> invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
> ...
> Kernel panic - not syncing: Fatal exception

This should not happen.  Which kernel version are you using?

There used to be a use-after-free on concurrent DPC and hot-removal.
It was fixed by 11a1f4bc4736, which went into v6.11 and was subsequently
ported all the way back to v5.10-stable.

I suspect you may be using a kernel which lacks that fix.

Thanks,

Lukas