I have tried to reproduce this. The circumstances weren't the mostWhat version of the kernel and patch-set did you test against?
controlled but they did overlap with what you described and I haven't seen
anything.
So I am guessing that you are having memory corruption from some source.On my DELL 1850 dual-core dual-Xeon system I did have a flaky DIMM which cause a few correctable ECC errors, but that has been replaced and still the same. My other test systems are (multiple) DELL 1425 dual-Xeon machines [2.8 or 3.0 GHz chips].
Either bad ram or a bad module.
I'm off on vacation for a week, so I won't be able to follow up.Have a good one...
Eric