Mel Gorman wrote:

On (22/08/07 13:50), Andrew Morton didst pronounce:
  

quoted

On Wed, 22 Aug 2007 13:48:00 -0700
Andrew Morton [off-list ref] wrote:

    

quoted

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.

  

quoted

--- 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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