Re: [PATCH v4] blk-mq: fix hang caused by freeze/unfreeze sequence

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To: Bob Liu <bob.liu@xxxxxxxxxx>, axboe@xxxxxxxxx
Subject: Re: [PATCH v4] blk-mq: fix hang caused by freeze/unfreeze sequence
From: Bart Van Assche <bvanassche@xxxxxxx>
Date: Mon, 29 Apr 2019 11:04:32 -0700
Cc: linux-block@xxxxxxxxxxxxxxx, hare@xxxxxxxx, ming.lei@xxxxxxxxxx, hch@xxxxxx, martin.petersen@xxxxxxxxxx, jinpuwang@xxxxxxxxx, rpenyaev@xxxxxxx
In-reply-to: <20190425102846.28911-1-bob.liu@oracle.com>
References: <20190425102846.28911-1-bob.liu@oracle.com>

On Thu, 2019-04-25 at 03:28 -0700, Bob Liu wrote:
+AD4 The following is a description of a hang in blk+AF8-mq+AF8-freeze+AF8-queue+AF8-wait().
+AD4 The hang happens on attempting to freeze a queue while another task does
+AD4 queue unfreeze.

Reviewed-by: Bart Van Assche +ADw-bvanassche+AEA-acm.org+AD4

References:
- [PATCH v4] blk-mq: fix hang caused by freeze/unfreeze sequence
  - From: Bob Liu

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