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Re: [dm-devel] [PATCH]dm-mpath: fix for race condition between multipath_dtr and pg_init_done.



> -----Original Message-----
> From: Mike Snitzer [mailto:snitzer redhat com]
> Sent: Wednesday, October 30, 2013 8:42 AM
> To: Merla, ShivaKrishna
> Cc: Hannes Reinecke; dm-devel redhat com; agk redhat com; Mikulas
> Patocka
> Subject: Re: [PATCH]dm-mpath: fix for race condition between
> multipath_dtr and pg_init_done.
> 
> On Wed, Oct 30 2013 at  9:32am -0400,
> Merla, ShivaKrishna <ShivaKrishna Merla netapp com> wrote:
> 
> >
> >
> > > -----Original Message-----
> > > From: Mike Snitzer [mailto:snitzer redhat com]
> > > Sent: Tuesday, October 29, 2013 7:57 PM
> > > To: Merla, ShivaKrishna
> > > Cc: Hannes Reinecke; dm-devel redhat com; agk redhat com; Mikulas
> > > Patocka
> > > Subject: Re: [PATCH]dm-mpath: fix for race condition between
> > > multipath_dtr and pg_init_done.
> ...
> > >
> > > So... do you have an updated patch with proper locking that takes
> > > Hannes' patch into consideration?
> > >
> > > I'll be reviewing hannes patch closer (for v3.13) tomorrow so if you'd
> > > like your issue resolved in the near-term I'd appreciate us getting some
> > > closer on proposed solutions.
> > >
> > > Thanks,
> > > Mike
> >
> > I have re-submitted my patch with locking in multipath_dtr. I
> > revisited Hannes patch and I think we still have this issue when
> > multipath is destroyed and path activation work is queued. This is
> > with the scenario of scsi_dh_rdac returning SCSI_DH_RETRY on
> > mode_select due to 5/91/36 CC's.
> 
> OK, I'll work toward including both patches.
Thanks Mike.


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