cpu hotplug oops on 2.6.15-rc5

(apologies if this is a dup)

Hi, I'm crashing 2.6.15-rc5 when I try and offline the last and only CPU in a node on a ppc64 Power5, SMT was disabled.

Here's the backtrace:

0:mon> t
[c0000001ad033820] c000000000096a7c .kfree+0x250/0x280
[c0000001ad0338d0] c00000000009a544 .cpuup_callback+0x238/0x5fc
[c0000001ad0339c0] c000000000068114 .notifier_call_chain+0x68/0x9c
[c0000001ad033a50] c0000000000789fc .cpu_down+0x1fc/0x368
[c0000001ad033b40] c0000000002ac658 .store_online+0x88/0xe8
[c0000001ad033bd0] c0000000002a6f14 .sysdev_store+0x4c/0x68
[c0000001ad033c50] c000000000110368 .sysfs_write_file+0x100/0x1a0
[c0000001ad033cf0] c0000000000be854 .vfs_write+0x100/0x200
[c0000001ad033d90] c0000000000bea64 .sys_write+0x54/0x9c
[c0000001ad033e30] c000000000008600 syscall_exit+0x0/0x18
--- Exception: c01 (System Call) at 000000000fe5ec10
SP (ffc4c4f0) is in userspace

0:mon> e
cpu 0x0: Vector: 300 (Data Access) at [c0000001ad033520]
    pc: c00000000048bd30: ._spin_lock+0x18/0x80
    lr: c000000000096a7c: .kfree+0x250/0x280
    sp: c0000001ad0337a0
   msr: 8000000000001032
   dar: 48
 dsisr: 40000000
  current = 0xc0000001aff12040
  paca    = 0xc0000000005c1000
    pid   = 17376, comm = bash


Should I try this with CONFIG_DEBUG_SLAB ?

Sonny
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