Re: 2.6.23-rc1-mm1: boot hang on ia64 with memoryless nodes

[Lee Schermerhorn <Lee.Schermerhorn@hp.com>]

On Wed, 2007-07-25 at 17:18 -0400, Lee Schermerhorn wrote: 
> On Wed, 2007-07-25 at 12:38 -0700, Christoph Lameter wrote:
> > (ccing Andy who did the work on the config stuff)
> > 
> > On Wed, 25 Jul 2007, Lee Schermerhorn wrote:
> > 
> > > I tried to deselect SPARSEMEM_VMEMMAP.  Kconfig's "def_bool=y" wouldn't
> > > let me :-(.  After hacking the Kconfig and mm/sparse.c to allow that,
> > > boot hangs with no error messages shortly after "Built N zonelists..."
> > > message.
> > 
> > I get a similar hang here and see the system looping in softirq / hrtimer 
> > code.
> > 
> > > Backed off to DISCONTIGMEM+VIRTUAL_MEMORY_MAP, and saw same hang as with
> > > (SPARSMEM && !SPARSEMEM_VMEMMAP).   
> > 
> > So its not related to SPARSE VMEMMAP? General VMEMMAP issue on IA64?
> 
> This hang is different from the one I see with SPARSE VMEMMAP -- no
> "Unable to handle kernel paging request..." message.  Just hangs after
> "Built N zonelists..."  and some message about "color" that I didn't
> capture.  Next time [:-(]...

The "color" message was actually:

Console:  colour dummy device 80x25

So, now I'm wondering if I'm hitting the "Regression in serial
console..." issue, and the system was actually booting--I just didn't
see any output.  If so, the "Unable to handle kernel paging request..."
hang might well be a problem with SPARSEMEM_VMEMMAP...

Lee