[PATCH 2/3] nvme-multipath: cannot disconnect controller on stuck partition scan

[Hannes Reinecke]

On 10/8/24 22:41, Keith Busch wrote:
> On Tue, Oct 08, 2024 at 09:17:47AM +0200, Hannes Reinecke wrote:
>> Hmm. Sadly, not really. Still stuck in partition scanning.
>>
>> Guess we'll need to check if we have paths available before triggering
>> partition scan; let me check ...
> 
> I think you must have two paths, and the 2nd path cleared the suppress
> bit before the 1st one finished its called to device_add_disk(). How
> about this one?
> 
Nope. Still stuck, this time in bdev_disc_changed().
With my testcase _all_ paths return NS_NOT_READY during partition scan, 
so I/O is constantly bounced between paths, and partition scan never 
returns. Doesn't matter where you call it, it's stuck.

The only chance we have is to modify I/O handling during scanning
(cf my new patchset).

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare at suse.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
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