I hit a similar problem while calling kzalloc(). it happened on linux-2.6.17-rc1 + ppc64.
kernel BUG in __cache_alloc_node at mm/slab.c:2934!
which is
BUG_ON(slabp->inuse == cachep->num);
3:mon> expr
cpu 0x3: Vector: 700 (Program Check) at [c0000000dac87870]
pc: c0000000000b75b0: .__cache_alloc_node+0x94/0x180
lr: c0000000000b756c: .__cache_alloc_node+0x50/0x180
sp: c0000000dac87af0
msr: 8000000000021032
current = 0xc0000000f1d3a040
paca = 0xc000000000439480
pid = 9508, comm = ipoib_comp/3
Thanks
Shirley Ma
IBM Linux Technology Center
15300 SW Koll Parkway
Beaverton, OR 97006-6063
Phone(Fax): (503) 578-7638
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