On Fri, Jan 26, 2018 at 7:36 AM, Dan Rue <dan.rue@xxxxxxxxxx> wrote: > > We've noticed that fsgsbase_64 can fail intermittently with the > following error: > > [RUN] ARCH_SET_GS(0x0) and clear gs, then schedule to 0x1 > Before schedule, set selector to 0x1 > other thread: ARCH_SET_GS(0x1) -- sel is 0x0 > [FAIL] GS/BASE changed from 0x1/0x0 to 0x0/0x0 > > This can be reliably reproduced by running fsgsbase_64 in a loop. i.e. > > for i in $(seq 1 10000); do ./fsgsbase_64 || break; done > > This problem isn't new - I've reproduced it on latest mainline and every > release going back to v4.12 (I did not try earlier). This was tested on > a Supermicro board with a Xeon E3-1220 as well as an Intel Nuc with an > i3-5010U. > Hmm, I can reproduce it, too. I'll look in a bit. -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
