Originally posted by vladpetric
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Another option is to try an ECC DIMM that's known to be defective.
Probably the best (and most difficult) is to use the kernel-support for injecting faults, and see if they're reported. A guy in the RealWolrdTech thread where Linus posted was talking about this, but hadn't updated with his relults, last I checked.
BTW, someone posted a link to an article showing that rowhammer is still possible (though much more difficult), even with ECC. But, what should be a lot easier is to try rowhammer and see if it causes an ECC event. That's all you need -- for it to trigger a correctable error. However, if your ECC support is indeed broken, then I guess you'd get a successful rowhammer, instead.
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