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Subjectcpu hotplug sleeping from invalid context
(2.6.17rc4-git9)

echo 0 > /sys/devices/system/cpu/cpu1/online
echo 1 > /sys/devices/system/cpu/cpu1/online

on my dual-core notebook gets me this:

CPU 1 is now offline
SMP alternatives: switching to UP code
SMP alternatives: switching to SMP code
Booting processor 1/1 eip 3000
CPU 1 irqstacks, hard=c0799000 soft=c0779000
Initializing CPU#1
BUG: sleeping function called from invalid context at mm/page_alloc.c:945
in_atomic():0, irqs_disabled():1
<c04500ce> __alloc_pages+0x32/0x2a8
<c0425577> printk+0x1f/0xaf
<c060674d> schedule+0xa21/0xa8a
<c04503a6> get_zeroed_page+0x31/0x3d
<c040a117> cpu_init+0x10a/0x323
<c04176f5> start_secondary+0xc/0x3ef
<c0417afa> cpu_exit_clear+0x22/0x43


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