linux-kernel - Re: [PATCH] nvme-pci: 512 byte aligned dma pool segment quirk

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Message-ID: <20241114121751.GA3971@lst.de>
Date: Thu, 14 Nov 2024 13:17:51 +0100
From: Christoph Hellwig <hch@....de>
To: Paweł Anikiel <panikiel@...gle.com>
Cc: bob.beckett@...labora.com, axboe@...nel.dk, hch@....de,
	kbusch@...nel.org, kernel@...labora.com,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	sagi@...mberg.me
Subject: Re: [PATCH] nvme-pci: 512 byte aligned dma pool segment quirk

On Thu, Nov 14, 2024 at 11:38:03AM +0000, Paweł Anikiel wrote:
> When doing a write of 264 sectors with PRP list offset of 0xf00,
> the bridge treats data as a pointer, and writes incorrect data to
> the drive. This might be why Robert is experiencing fs corruption.

Not having the hardware and just speculating, but this seems like
a pretty likely failure mode.

**still cursing nvme for all this PRP brain damange**