Re: corruption

[Andrew Morton <andrewm@uow.edu.au>]

Jens Axboe wrote:
> 
> On Fri, Dec 01 2000, Andrew Morton wrote:
> > Andrew Morton wrote:
> > >
> > > I bet this'll catch it:
> > >
> > > --- include/linux/list.h.orig   Fri Dec  1 08:33:36 2000
> > > +++ include/linux/list.h        Fri Dec  1 08:33:55 2000
> > > @@ -90,6 +90,7 @@
> > >  static __inline__ void list_del(struct list_head *entry)
> > >  {
> > >         __list_del(entry->prev, entry->next);
> > > +       entry->next = entry->prev = 0;
> > >  }
> > >
> > >  /**
> > >
> > > First person to send a ksymoops trace gets a cookie.
> >
> > mmmm... choc-chip.
> >
> > With the above patch applied the machine crashed after an hour. Crashed
> > a second time during the e2fsck.  gdb backtrace:
> 
> Very interesting. IDE / SCSI?

hmm..  Overlapping emails.

The crash with e2fsck was easily repeatable with the above patch.  Just
dirty a few buffers and run /sbin/sync.  It's due to the __make_request
queue_head thing which you fixed in test12-pre3.  Yes, this was IDE.

However the original problem of a list_del being performed on a wild
pointer is being seen on SCSI systems.  I expect the above patch will
catch it if it's still happening.
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