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

To: Martin Wilck <mwilck@xxxxxxxx>, 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: Bart Van Assche <bvanassche@xxxxxxx>
Date: Mon, 16 Jan 2023 09:48:33 -0800
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: <017b6c73f56505e63519e4b79fe69d66abddf810.camel@suse.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1

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 kernelmodules are removed.


Thanks,

Bart.

Follow-Ups:
- 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: Martin Wilck

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