Random memory corruption going undetected by memtest86
- by sds
Thinkpad t520; Ubuntu 12.04.1 LTS; 3.2.0-33-generic 16GB of ram
Memtest86+ ran for 26 hours, 9 passes, no errors
Booted into "recovery mode"; Ran fsck all filesystems - no errors; "check all packages" - no errors
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?