linux-kernel - Re: [PATCH] nvme: fix double blk_mq_complete_request for timeout request with low probability

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Date:   Sat, 8 Apr 2023 00:34:22 +0300
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Keith Busch <kbusch@...nel.org>, Lei Lei2 Yin <yinlei2@...ovo.com>
Cc:     "axboe@...com" <axboe@...com>, "hch@....de" <hch@....de>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cybeyond@...mail.com" <cybeyond@...mail.com>
Subject: Re: [PATCH] nvme: fix double blk_mq_complete_request for timeout
 request with low probability


>> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
>> index 53ef028596c6..c1cc384f4f3e 100644
>> --- a/drivers/nvme/host/core.c
>> +++ b/drivers/nvme/host/core.c
>> @@ -450,8 +450,8 @@ bool nvme_cancel_request(struct request *req, void *data)
>>   	dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
>>   				"Cancelling I/O %d", req->tag);
>>   
>> -	/* don't abort one completed request */
>> -	if (blk_mq_request_completed(req))
>> +	/* don't abort one completed or idle request */
>> +	if (blk_mq_rq_state(req) != MQ_RQ_IN_FLIGHT)
>>   		return true;
> 
> I was suspicious about this path too, and had the same change long ago, but
> shelved it when I couldn't produce any errors there. But the change makes sense
> to me!
> 
> Reviewed-by: Keith Busch <kbusch@...nel.org>

We need to change nvmf_complete_timed_out_request() too.

Reviewed-by: Sagi Grimberg <sagi@...mberg.me>