> Then check 2.6.22 and specify the boot parameter "slub_debug". Make sure 
> to compile the kernel with slub support. Is there any way you could get 

With 2.6.22, slub on and slub_debug on the command line I get

PID hash table entries: 4096 (order: 12, 32768 bytes)
Console: colour dummy device 80x25
Dentry cache hash table entries: 262144 (order: 5, 2097152 bytes0005416c/2
Call Trace:
[c00000000ff87ce8] [c00000000000f2cc] .show_stack+0x68/0x1b0 (unreliable)
[c00000000ff87d88] [c000000000347d3c] .schedule+0xa4/0x8f0
[c00000000ff87e88] [c0000000003486f4] .wait_for_completion+0xd8/0x174
[c00000000ff87f48] [c000000000071770] .kthreadd+0x124/0x1b8
[c00000000ff87fd8] [c0000000000256f8] .kernel_thread+0x4c/0x68
BUG: scheduling while atomic: kthreadd/0x0005416c/2
Call Trace:
[c00000000ff87da8] [c00000000000f2cc] .show_stack+0x68/0x1b0 (unreliable)
[c00000000ff87e48] [c000000000347d3c] .schedule+0xa4/0x8f0
[c00000000ff87f48] [c0000000000716e0] .kthreadd+0x94/0x1b8
[c00000000ff87fd8] [c0000000000256f8] .kernel_thread+0x4c/0x68
BUG: scheduling while atomic: kthreadd/0x0005416c/2
Call Trace:
[c00000000ff87ce8] [c00000000000f2cc] .show_stack+0x68/0x1b0 (unreliable)
[c00000000ff87d88] [c000000000347d3c] .schedule+0xa4/0x8f0
[c00000000ff87e88] [c0000000003486f4] .wait_for_completion+0xd8/0x174
[c00000000ff87f48] [c000000000071770] .kthreadd+0x124/0x1b8
[c00000000ff87fd8] [c0000000000256f8] .kernel_thread+0x4c/0x68
BUG: scheduling while atomic: kthreadd/0x0183eeb8/4
Call Trace:
[c00000000ff9bf10] [c00000000000f2cc] .show_stack+0x68/0x1b0 (unreliable)
[c00000000ff9bfb0] [c000000000347d3c] .schedule+0xa4/0x8f0
[c00000000ff9c0b0] [c000000000071960] .kthread+0x40/0xc4
[c00000000ff9c140] [c0000000000256f8] .kernel_thread+0x4c/0x68
BUG: scheduling while atomic: kthreadd/0x0005416c/2
Call Trace:
[c00000000ff87da8] [c00000000000f2cc] .show_stack+0x68/0x1b0 (unreliable)
[c00000000ff87e48] [c000000000347d3c] .schedule+0xa4/0x8f0
[c00000000ff87f48] [c0000000000716e0] .kthreadd+0x94/0x1b8
[c00000000ff87fd8] [c0000000000256f8] .kernel_thread+0x4c/0x68

> us further information about the problem?

Sure, what do you need ?

The system is a Cell Blade with 2G memory, hence numa support enabled.
I built the 2.6.22 with cell_defconfig and manually selected SLUB.

Gruß,
	Jens