linux-kernel - Module removal-related regression?

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Date:   Sat, 9 Sep 2017 19:41:21 +0200
From:   Jakub Kicinski <kubakici@...pl>
To:     LKML <linux-kernel@...r.kernel.org>
Subject: Module removal-related regression?

Hi!

I'm having trouble with modules on linux/master.  rmmod succeeds but the
module is still loaded and the refcount goes to 1:

#rmmod nfp; insmod ./src/nfp.ko nfp_pf_netdev=0 ; \
	/opt/netronome/bin/nfp-hwinfo -n 2  assembly.partno \
	lsmod | grep nfp; \
	rmmod nfp; \
	lsmod | grep nfp 
nfp                   249856  0 
nfp                   200704  1 

If I rmmod again the module will be actually unloaded.  The user space
is mostly Ubuntu 14.04.  Has anyone seen this?  I'm trying to bisect
now...