Re: kernel BUG scsi_dh_alua sleeping from invalid context && kernel WARNING do not call blocking ops when !TASK_RUNNING

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To: Bart Van Assche <bvanassche@xxxxxxx>, Steffen Maier <maier@xxxxxxxxxxxxx>, linux-scsi <linux-scsi@xxxxxxxxxxxxxxx>
Subject: Re: kernel BUG scsi_dh_alua sleeping from invalid context && kernel WARNING do not call blocking ops when !TASK_RUNNING
From: Martin Wilck <mwilck@xxxxxxxx>
Date: Mon, 16 Jan 2023 18:58:06 +0100
Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, "James E . J . Bottomley" <jejb@xxxxxxxxxxxxx>, Sachin Sant <sachinp@xxxxxxxxxxxxx>, Hannes Reinecke <hare@xxxxxxx>, Benjamin Block <bblock@xxxxxxxxxxxxx>, linux-s390 <linux-s390@xxxxxxxxxxxxxxx>
In-reply-to: <a9da2b27-882f-bc8e-3400-cb53440e2159@acm.org>
User-agent: Evolution 3.46.3

On Mon, 2023-01-16 at 09:48 -0800, Bart Van Assche wrote:
> On 1/16/23 08:57, Martin Wilck wrote:
> > Can we simply defer the scsi_device_put() to a workqueue?
> 
> I'm concerned that would reintroduce a race condition when LLD kernel
> modules are removed.

So what else do you suggest?

Thanks,
Martin

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References:
- kernel BUG scsi_dh_alua sleeping from invalid context && kernel WARNING do not call blocking ops when !TASK_RUNNING
  - From: Steffen Maier
- Re: kernel BUG scsi_dh_alua sleeping from invalid context && kernel WARNING do not call blocking ops when !TASK_RUNNING
  - From: Martin Wilck
- Re: kernel BUG scsi_dh_alua sleeping from invalid context && kernel WARNING do not call blocking ops when !TASK_RUNNING
  - From: Bart Van Assche

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