Hello, I faces with bug. What is this??

[조정욱]

Hello, everyone.

I ran programs in ubuntu 9.04.
The machine has 4  cores which frequency is 1Ghz.
The memory size is 4Gbyte.


I ran 4 programs and then the message appeared.



[ 2192.584002] BUG: soft lockup - CPU#0 stuck for 61s! [pdflush:47]
[ 2226.941502] BUG: soft lockup - CPU#3 stuck for 61s!
[hald-addon-acpi:2246]
[ 2229.089002] BUG: soft lockup - CPU#2 stuck for 61s!
[console-kit-dae:2124]
[ 2258.080021] BUG: soft lockup - CPU#0 stuck for 61s! [pdflush:47]

I wander the meaning of [ 2258.080021].
And what is soft lockup?? Is it lock the core hold??
Lastly, in 61s! , s means second??

And is there any method to avoid this problems?
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