I found a patch here:
http://forum.canardpc.com/archive/index.php/t-115443.html
Applying the patch to the current debian version of memtest86+ fixes the
problem for me!
I was getting regular test 7 errors in the first 1M of RAM using the
memtest86+ 5.01 iso from the official website. Using the debian version
decreased the frequency of these errors but did not eliminate them. The
problem only manifested in the SMP version of test 7. With the patch
below the problem goes away completely!
This error was driving me nuts, I tried 3 different RAM manufacturers
and two different Dell M6800s and the error persisted. I was sure
something was overheating or out of spec.
Thanks for maintaining our old faithful memtest86!
--- a/main.c
+++ b/main.c
@@ -852,6 +852,7 @@
cprint(LINE_RANGE, COL_MID+30, " of ");
aprint(LINE_RANGE, COL_MID+34, v->selected_pages);
}
+ s_barrier();
switch(tseq[test].pat) {
