Re: kern/42662: iop driver makes kernel crash or freeze

[Aleksej Saushev <asau%inbox.ru@localhost>]

Manuel Bouyer <bouyer%antioche.eu.org@localhost> writes:

>  On Fri, Jan 22, 2010 at 05:50:01PM +0000, Aleksej Saushev wrote:
>  >    5.0_STABLE installation kernel panics when initializing iop driver,
>  >    5.99.24 kernel as of 2009-01-21 crashes too,
>  >    5.99.24 kernel as of today doesn't crash, it freezes instead.
>  > 
>  >    All diagnostics below corresponds to 5.0_STABLE.
>  > 
>  >    Kernel message at panic:
>  > 
>  >    iop0 at pci3 dev 3 function 0: I2O adapterpanic: _bus_dmamap_sync: mix 
> PRE and POST
>  
>  Can you try the attached patch on netbsd-5 ?
>  No idea why it hangs on current, more info needed.

I applied it to the current instead, it crashes with the same diagnostic
message and similar backtrace, only it seems to do it a bit later.
I can try to replace as many instances of the pattern as needed,
can you recommend how many of them? All in that subroutine?

>  RCS file: /cvsroot/src/sys/dev/i2o/iop.c,v
>  --- iop.c    21 Oct 2009 21:12:05 -0000      1.77
>  +++ iop.c    22 Jan 2010 18:03:53 -0000
>  @@ -928,7 +928,7 @@ iop_status_get(struct iop_softc *sc, int
>           BUS_DMASYNC_PREWRITE);
>       memset(st, 0, sizeof(*st));
>       bus_dmamap_sync(sc->sc_dmat, sc->sc_scr_dmamap, 0, sizeof(*st),
>  -        BUS_DMASYNC_PREREAD|BUS_DMASYNC_POSTWRITE);
>  +        BUS_DMASYNC_POSTWRITE);
>   
>       if ((rv = iop_post(sc, (u_int32_t *)&mf)) != 0)
>               return (rv);


-- 
HE CE3OH...