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

[Ming Lei]

On Tue, Jul 06, 2021 at 10:10:10AM +0200, Daniel Wagner wrote:
> 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 :)

> /sys/kernel/debug/block/nvme0c0n1# find . -type f -exec grep -aH . {} \;

It is the mpath device's debugfs, what is output for the nvmef's
debugfs?


Thanks,
Ming