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

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

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.

> [...]
>       Another, possibly unrelated problem affects only current:
>       when disabling iop in userconf, current fails to mount root fs
>       and starts probing for /sbin/init, /sbin/oinit and so on.

Looks more like a module issue; the ffs module is not loaded.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--

Index: iop.c
===================================================================
RCS file: /cvsroot/src/sys/dev/i2o/iop.c,v
retrieving revision 1.77
diff -u -p -u -r1.77 iop.c
--- 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);