From: Christoph Hellwig <hch@lst.de>
To: Chao Leng <lengchao@huawei.com>
Cc: Sagi Grimberg <sagi@grimberg.me>, Christoph Hellwig <hch@lst.de>,
Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-nvme@lists.infradead.org
Subject: Re: [PATCH 2/2] nvme-multipath: don't block on blk_queue_enter of the underlying device
Date: Tue, 23 Mar 2021 17:17:02 +0100 [thread overview]
Message-ID: <20210323161702.GB13402@lst.de> (raw)
In-Reply-To: <87a0ede6-b696-d34d-e74d-56429fe32ae7@huawei.com>
On Tue, Mar 23, 2021 at 04:13:09PM +0800, Chao Leng wrote:
>> The above reproduces with the patch applied on upstream nvme code.The new patch(blk_mq_submit_bio_direct) will cause the bug again.
> Because it revert add the bio to current->bio_list.
> Just try the upstream nvme code, and do not apply the new patch(blk_mq_submit_bio_direct).
Indeed, the patch removes the deferred submission, so the original
deadlock should not happen.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Chao Leng <lengchao@huawei.com>
Cc: Sagi Grimberg <sagi@grimberg.me>, Christoph Hellwig <hch@lst.de>,
Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-nvme@lists.infradead.org
Subject: Re: [PATCH 2/2] nvme-multipath: don't block on blk_queue_enter of the underlying device
Date: Tue, 23 Mar 2021 17:17:02 +0100 [thread overview]
Message-ID: <20210323161702.GB13402@lst.de> (raw)
In-Reply-To: <87a0ede6-b696-d34d-e74d-56429fe32ae7@huawei.com>
On Tue, Mar 23, 2021 at 04:13:09PM +0800, Chao Leng wrote:
>> The above reproduces with the patch applied on upstream nvme code.The new patch(blk_mq_submit_bio_direct) will cause the bug again.
> Because it revert add the bio to current->bio_list.
> Just try the upstream nvme code, and do not apply the new patch(blk_mq_submit_bio_direct).
Indeed, the patch removes the deferred submission, so the original
deadlock should not happen.
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next prev parent reply other threads:[~2021-03-23 16:17 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-22 7:37 fix nvme-tcp and nvme-rdma controller reset hangs when using multipath Christoph Hellwig
2021-03-22 7:37 ` Christoph Hellwig
2021-03-22 7:37 ` [PATCH 1/2] blk-mq: add a blk_mq_submit_bio_direct API Christoph Hellwig
2021-03-22 7:37 ` Christoph Hellwig
2021-03-22 11:23 ` Hannes Reinecke
2021-03-22 11:23 ` Hannes Reinecke
2021-03-22 15:30 ` Keith Busch
2021-03-22 15:30 ` Keith Busch
2021-03-22 7:37 ` [PATCH 2/2] nvme-multipath: don't block on blk_queue_enter of the underlying device Christoph Hellwig
2021-03-22 7:37 ` Christoph Hellwig
2021-03-22 11:22 ` Hannes Reinecke
2021-03-22 11:22 ` Hannes Reinecke
2021-03-22 15:31 ` Keith Busch
2021-03-22 15:31 ` Keith Busch
2021-03-23 2:57 ` Sagi Grimberg
2021-03-23 2:57 ` Sagi Grimberg
2021-03-23 3:23 ` Sagi Grimberg
2021-03-23 3:23 ` Sagi Grimberg
2021-03-23 7:04 ` Chao Leng
2021-03-23 7:04 ` Chao Leng
2021-03-23 7:36 ` Sagi Grimberg
2021-03-23 7:36 ` Sagi Grimberg
2021-03-23 8:13 ` Chao Leng
2021-03-23 8:13 ` Chao Leng
2021-03-23 16:17 ` Christoph Hellwig [this message]
2021-03-23 16:17 ` Christoph Hellwig
2021-03-23 16:15 ` Christoph Hellwig
2021-03-23 16:15 ` Christoph Hellwig
2021-03-23 18:13 ` Sagi Grimberg
2021-03-23 18:13 ` Sagi Grimberg
2021-03-23 18:22 ` Christoph Hellwig
2021-03-23 18:22 ` Christoph Hellwig
2021-03-23 19:00 ` Sagi Grimberg
2021-03-23 19:00 ` Sagi Grimberg
2021-03-23 19:01 ` Christoph Hellwig
2021-03-23 19:01 ` Christoph Hellwig
2021-03-23 19:10 ` Sagi Grimberg
2021-03-23 19:10 ` Sagi Grimberg
2021-03-23 7:28 ` Hannes Reinecke
2021-03-23 7:28 ` Hannes Reinecke
2021-03-23 7:31 ` Sagi Grimberg
2021-03-23 7:31 ` Sagi Grimberg
2021-03-23 8:36 ` Hannes Reinecke
2021-03-23 8:36 ` Hannes Reinecke
2021-03-23 14:53 ` Keith Busch
2021-03-23 14:53 ` Keith Busch
2021-03-23 16:19 ` Christoph Hellwig
2021-03-23 16:19 ` Christoph Hellwig
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