linux-kernel - igb in 5.15: autosuspend hangs netlink

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Date:   Sun, 7 Nov 2021 21:43:48 +0100
From:   Kurt Garloff <kurt@...loff.de>
To:     e1000-devel@...ts.sourceforge.net
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: igb in 5.15: autosuspend hangs netlink

Hi,

I have several NICs enslaved to a bridge.

Enabling powermanagement (setting the pcie device power/control to auto) for
an intel I211 Gigabit Network device hangs the Linux kernel's netlink interface.
Commands like `ip addr show` no longer work but just hang.
Note: There's nothing connected to the i211, so I assume it goes to sleep indeed.
There's no recovery -- trying to echo "on" to the power/control does not recover
the netlink interface -- I have not found a better recovery than rebooting yet.

This problem did not exist in 5.10.y kernels, it does exist in 5.15.[01].
The device is powered by the igb driver.

Let me know if this problem is not known yet and you need more information.

Best,

-- 
Kurt Garloff <kurt@...loff.de>
Cologne, Germany