netdev - devlink dump of mlxsw_adj table triggers a panic

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Date:   Wed, 4 Oct 2017 16:57:35 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Arkadi Sharshevsky <arkadis@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: devlink dump of mlxsw_adj table triggers a panic

The following devlink command on a 2700 triggers a panic every time.
Kernel is net-next at 26873308b21654b6e0785b9f9e2c5414d37a4c4c

$ devlink  dpipe table dump pci/0000:03:00.0 name mlxsw_adj
devlink answers: No buffer space available
<hang>

I have seen several different stack traces and varying amounts of EMAD
errors on console:

[   77.453364] mlxsw_spectrum 0000:03:00.0: EMAD reg access failed
(tid=64c24a400003688,reg_id=200b(sfn),type=query,status=0(operation
performed))
[   77.466568] mlxsw_spectrum 0000:03:00.0: Failed to get FDB notifications

If it does not reproduce for you let me know and I'll grab a trace.

David