On Tue, Jun 8, 2021 at 8:42 AM Gary Jennejohn <gljennj...@gmail.com> wrote:
> On Tue, 8 Jun 2021 06:48:19 -0600 > Warner Losh <i...@bsdimp.com> wrote: > > > Sorry to reply to myself... had a thought as my brain rested while making > > tea... > > > > I think we may need to consider reverting (or at least not yet enabling) > > the uma stuff. > > > > I tested and enabled the UMA CCB stuff immediately after trasz had > committed it. I was able to copy files panic-free over USB until > recently AFAICR. > > I also have had the kern.cam.ada.enable_uma_ccbs=1 set since > then and have never seen a problem there. Only with USB. > Yes. This specific bug only affects SCSI. And it only affects it when there's an error that requires a restart. I've not yet had the time to do an audit for where else the copying is done... > I'll try booting a new kernel with the uma_ccb sysctl's set to 0 > and see what happens. > > BTW I now have a kernel compiled with -O0 ready to test. > Great! Warner
