Re: [bisected] Re: Module removal-related regression?

[Jakub Kicinski]

On Sat, 9 Sep 2017 12:55:51 -0700, Dmitry Torokhov wrote:
> On Sat, Sep 9, 2017 at 12:27 PM, Jakub Kicinski <kubakici@xxxxx> wrote:
> > On Sat, 9 Sep 2017 19:41:21 +0200, Jakub Kicinski wrote:  
> >> 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...  
> >
> > Got 'em!
> >
> > commit 1455cf8dbfd06aa7651dcfccbadb7a093944ca65 (HEAD, refs/bisect/bad)
> > Author: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> > Date:   Wed Jul 19 17:24:30 2017 -0700
> >
> >     driver core: emit uevents when device is bound to a driver  
> 
> Does it happen with all modules or only nfp one?
> 
> It seems to work here:
> 
> dtor@dtor-glaptop3:~ $ lsmod | grep psmouse
> psmouse               135168  0
> dtor@dtor-glaptop3:~ $ sudo rmmod psmouse
> dtor@dtor-glaptop3:~ $ lsmod | grep psmouse
> dtor@dtor-glaptop3:~ $ sudo modprobe psmouse

Yes, and only if FW is loaded/requested successfully.  Hmm... 

I'm building a kernel with more debug, any particular suggestions?