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From: Jens Axboe <axboe@kernel.dk>
To: Ming Lei <ming.lei@redhat.com>, Christoph Hellwig <hch@lst.de>
Cc: linux-block@vger.kernel.org, Yi Zhang <yi.zhang@redhat.com>,
	Bart Van Assche <bvanassche@acm.org>
Subject: Re: [PATCH V3 0/2] block: fix race between adding wbt and normal IO
Date: Wed, 16 Jun 2021 08:42:18 -0600	[thread overview]
Message-ID: <8d369b6c-bb80-87e6-b970-1c5b7556f027@kernel.dk> (raw)
In-Reply-To: <20210609015822.103433-1-ming.lei@redhat.com>

On 6/8/21 7:58 PM, Ming Lei wrote:
> Hello,
> 
> Yi reported several kernel panics on:
> 
> [16687.001777] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008
> ...
> [16687.163549] pc : __rq_qos_track+0x38/0x60
> 
> or
> 
> [  997.690455] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020
> ...
> [  997.850347] pc : __rq_qos_done+0x2c/0x50
> 
> Turns out it is caused by race between adding wbt and normal IO.
> 
> Fix the issue by freezing request queue when adding/deleting rq qos.

Applied, thanks.

-- 
Jens Axboe


      parent reply	other threads:[~2021-06-16 14:42 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-09  1:58 Ming Lei
2021-06-09  1:58 ` [PATCH V3 1/2] block: fix race between adding/removing rq qos " Ming Lei
2021-06-09 20:05   ` Bart Van Assche
2021-06-09  1:58 ` [PATCH V3 2/2] block: mark queue init done at the end of blk_register_queue Ming Lei
2021-06-09 20:09   ` Bart Van Assche
2021-06-10  0:45 ` [PATCH V3 0/2] block: fix race between adding wbt and normal IO Yi Zhang
2021-06-14 21:55 ` Ming Lei
2021-06-16 14:11   ` Ming Lei
2021-06-16 14:42 ` Jens Axboe [this message]

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