[PATCH v10 0/5] shut down devices asynchronously

[Jeremy Allison]

On Thu, Jul 03, 2025 at 01:46:56PM +0200, Christoph Hellwig wrote:
>On Wed, Jun 25, 2025 at 03:18:48PM -0500, Stuart Hayes wrote:
>> Address resource and timing issues when spawning a unique async thread
>> for every device during shutdown:
>>   * Make the asynchronous threads able to shut down multiple devices,
>>     instead of spawning a unique thread for every device.
>>   * Modify core kernel async code with a custom wake function so it
>>     doesn't wake up threads waiting to synchronize every time the cookie
>>     changes
>
>Given all these thread spawning issues, why can't we just go back
>to the approach that kicks off shutdown asynchronously and then waits
>for it without spawning all these threads?

It isn't just an nvme issue. Red Hat found the same issue
with SCSI devices.

My colleague Sultan Alsawaf posted a simpler fix for the
earlier patch here:

https://lists.infradead.org/pipermail/linux-nvme/2025-January/053666.html

Maybe this could be explored.