[...]
I have just seen this on boot, with 2.6.22-rc2-mm1 on x86_64:
[...]
BUG: at include/linux/slub_def.h:88 kmalloc_index()
Call Trace:
[<ffffffff8034f3f9>] pci_dev_put+0x12/0x14
[<ffffffff80283f30>] get_slab+0xb5/0x265
[<ffffffff802841bc>] __kmalloc+0x13/0xa3
[<ffffffff8021a4aa>] cache_k8_northbridges+0x80/0x116
[<ffffffff8063fed2>] gart_iommu_init+0x16/0x594
[<ffffffff804562ac>] genl_rcv+0x0/0x68
[<ffffffff804548ed>] netlink_kernel_create+0x15e/0x16b
[<ffffffff804acc52>] mutex_unlock+0x9/0xb
[<ffffffff80639fad>] pci_iommu_init+0x9/0x12
[<ffffffff806306af>] kernel_init+0x152/0x322
[<ffffffff80249c7c>] trace_hardirqs_on+0xc0/0x14e
[<ffffffff804ae03d>] trace_hardirqs_on_thunk+0x35/0x37
[<ffffffff80249c7c>] trace_hardirqs_on+0xc0/0x14e
[<ffffffff8020a848>] child_rip+0xa/0x12
[<ffffffff80209f5c>] restore_args+0x0/0x30
[<ffffffff8063055d>] kernel_init+0x0/0x322
[<ffffffff8020a83e>] child_rip+0x0/0x12
PCI-GART: No AMD northbridge found.
hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
hpet0: 3 64-bit timers, 14318180 Hz
ACPI: RTC can wake from S4
pnp: 00:01: iomem range 0xf0000000-0xf3ffffff has been reserved
pnp: 00:01: iomem range 0xfed13000-0xfed13fff has been reserved