2.5.42: Debug: sleeping function called from illegal context at mm/slab.c:1374

1. sleeping function called from illegal context at mm/slab.c:1374

I seem to have hit a debug trigger while booting in 2.5.41. The
calltrace suggests it is an IDE problem:

Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX4: IDE controller at PCI slot 00:07.1
PIIX4: chipset revision 1
PIIX4: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0x0860-0x0867, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0x0868-0x086f, BIOS settings: hdc:pio, hdd:pio
hda: FUJITSU MHJ2181AT, ATA DISK drive
Debug: sleeping function called from illegal context at mm/slab.c:1374
Call Trace:
 [<c01138f4>] __might_sleep+0x54/0x60
 [<c012e1d3>] kmem_cache_alloc+0x23/0xd0
 [<c01f8b50>] blk_init_free_list+0x4c/0xd0
 [<c0108998>] request_irq+0x8c/0xa8
 [<c01f8be0>] blk_init_queue+0xc/0xd4
 [<c01fd7f0>] ide_init_queue+0x28/0x68
 [<c0203a20>] do_ide_request+0x0/0x18
 [<c01fdaad>] init_irq+0x27d/0x334
 [<c01fde06>] hwif_init+0x112/0x258
 [<c01fd71c>] probe_hwif_init+0x1c/0x6c
 [<c0209b4d>] ide_setup_pci_device+0x3d/0x68
 [<c01fc77f>] piix_init_one+0x37/0x40
 [<c010508b>] init+0x33/0x188
 [<c0105058>] init+0x0/0x188
 [<c01054a9>] kernel_thread_helper+0x5/0xc

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