Fxp / polling / witness panic

[Robin P. Blanchard]

> >#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:238
> > 238             dumping++;
> > (kgdb) bt
> >#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:238
> >#1  0xc01d8133 in boot (howto=256) at 
> >/usr/src/sys/kern/kern_shutdown.c:370
> >#2  0xc01d847b in panic () at /usr/src/sys/kern/kern_shutdown.c:543
> >#3  0xc01fb681 in witness_lock (lock=0xc1526160, flags=8, 
> >     file=0xc0308197 "/usr/src/sys/dev/fxp/if_fxp.c", line=1465)
> >     at /usr/src/sys/kern/subr_witness.c:722
> 
> What is the actual panic?
> 
> Is it this one?
> 
> KASSERT((lock1->li_lock->lo_flags & LO_WITNESS) == 0,
>     ("lock missing witness structure"));
> 
> Looks like the lock may be used after it was destroyed or some such.


Yep. That would be the one.