Re: [BUG] 2.6.23-rc3-mm1 kernel BUG at mm/page_alloc.c:2876!

[Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>]

Mel Gorman wrote:
> On (22/08/07 13:50), Andrew Morton didst pronounce:
>   
> > On Wed, 22 Aug 2007 13:48:00 -0700
> > Andrew Morton <akpm@linux-foundation.org> wrote:
> >
> >     
> > > This:
> > >
> > > --- a/mm/page_alloc.c~a
> > > +++ a/mm/page_alloc.c
> > > @@ -2814,6 +2814,8 @@ static int __cpuinit process_zones(int c
> > >  	return 0;
> > >  bad:
> > >  	for_each_zone(dzone) {
> > > +		if (!populated_zone(zone))
> > > +			continue;		
> > >  		if (dzone == zone)
> > >  			break;
> > >  		kfree(zone_pcp(dzone, cpu));
> > > _
> > >
> > > might help avoid the crash
> > >       
> > err, make that
> >
> >     
>
> We're already in the error path at this point and it's going to blow up.
> The real problem is kmalloc_node() returning NULL for whatever reason.
>
>   
> > --- a/mm/page_alloc.c~a
> > +++ a/mm/page_alloc.c
> > @@ -2814,6 +2814,8 @@ static int __cpuinit process_zones(int c
> >  	return 0;
> >  bad:
> >  	for_each_zone(dzone) {
> > +		if (!populated_zone(dzone))
> > +			continue;
> >  		if (dzone == zone)
> >  			break;
> >  		kfree(zone_pcp(dzone, cpu));
> > _
> >
> >
> >     
>
>   
After applying the patch, the call trace is gone but the kernel bug
is still hit


Memory: 4105840k/4194304k available (4964k kernel code, 88464k reserved, 
948k data, 571k bss, 264k init)
SLUB: Genslabs=12, HWalign=128, Order=0-1, MinObjects=4, CPUs=4, Nodes=16
------------[ cut here ]------------
kernel BUG at mm/page_alloc.c:2878!
cpu 0x0: Vector: 700 (Program Check) at [c0000000005cbbe0]
pc: c0000000004b5160: .setup_per_cpu_pageset+0x24/0x48
lr: c0000000004b5160: .setup_per_cpu_pageset+0x24/0x48
sp: c0000000005cbe60
msr: 8000000000029032
current = 0xc0000000004fd1b0
paca = 0xc0000000004fdd80
pid = 0, comm = swapper
kernel BUG at mm/page_alloc.c:2878!
enter ? for help
[c0000000005cbee0] c0000000004978d8 .start_kernel+0x304/0x3f4
[c0000000005cbf90] c0000000003bef1c .start_here_common+0x54/0x58

-
Kamalesh Babulal




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