linux-kernel - Re: [PATCH 2/2] nvme-fc: Wait with a timeout for queue to freeze

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Message-ID: <20210706081010.dqmg7bxik5gnym5k@beryllium.lan>
Date:   Tue, 6 Jul 2021 10:10:10 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        James Smart <james.smart@...adcom.com>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Sagi Grimberg <sagi@...mberg.me>
Subject: Re: [PATCH 2/2] nvme-fc: Wait with a timeout for queue to freeze

On Tue, Jul 06, 2021 at 03:29:11PM +0800, Ming Lei wrote:
> > and this seems to confirm, no I/O in flight.
> 
> What is the output of the following command after the hang is triggered?
> 
> (cd /sys/kernel/debug/block/nvme0n1 && find . -type f -exec grep -aH . {} \;)
> 
> Suppose the hang disk is nvme0n1.

see attachement

> No, percpu_ref_is_zero() is fine to be called in atomic mode.

Okay, that is what I hoped for :)

View attachment "blk-debug.txt" of type "text/plain" (17832 bytes)