[techtalk] free_one_pmd: bad directory entry 00000020

[Jeff Dike]

> free_one_pmd: bad directory entry 00000020
> Is this a kernel error and how severe is it? Should I worry?

This looks like a NULL which has had a one-bit error in it.  If so, you have 
some flaky memory.

It could crash your system if it happens in the right place.  The error above 
happened in a page table, which pretty serious.  If it had switched a bit in a 
non-zero pmd, you could have had some pretty serious data corruption.

				Jeff