Random memory corruption going undetected by memtest86

Posted by sds on Ask Ubuntu See other posts from Ask Ubuntu or by sds
Published on 2012-11-18T04:00:33Z Indexed on 2012/11/18 5:18 UTC
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  1. Thinkpad t520; Ubuntu 12.04.1 LTS; 3.2.0-33-generic 16GB of ram
  2. Memtest86+ ran for 26 hours, 9 passes, no errors
  3. Booted into "recovery mode"; Ran fsck all filesystems - no errors; "check all packages" - no errors
  4. apparent random memory corruption: perl/R/chrome segfault every now and then, seemingly at random; sort(1) produces corrupt unsorted files.

What could be possibly wrong and how do I debug it?

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