linux-kernel - Re: modprobe mlx5_core on OCI bare-metal instance causes unrecoverable hang and I/O error

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Message-ID: <20250207190152.GA3665794@ziepe.ca>
Date: Fri, 7 Feb 2025 15:01:52 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Mitchell Augustin <mitchell.augustin@...onical.com>
Cc: saeedm@...dia.com, leon@...nel.org, tariqt@...dia.com,
	andrew+netdev@...n.ch, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org, Talat Batheesh <talatb@...dia.com>,
	Feras Daoud <ferasda@...dia.com>
Subject: Re: modprobe mlx5_core on OCI bare-metal instance causes
 unrecoverable hang and I/O error

On Fri, Feb 07, 2025 at 10:02:46AM -0600, Mitchell Augustin wrote:
> > Is it using iscsi/srp/nfs/etc for any filesystems?
> 
> Yes, dev sda is using iSCSI:

If you remove the driver that is providing transport for your
filesystem the system will hang like you showed.

It can be done, but the process sequencing the load/unload has to be
entirely contained to a tmpfs so it doesn't become blocked on IO that
cannot complete.

Jason