FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/pcid
commit f825f895d74ff7b82d9a037e2f82d2613e8d4c2d ("x86/mm: Try to preserve old TLB entries using PCID")


The aim9 exec_test is killed with "Segmentation fault".


AIM Independent Resource Benchmark - Suite IX v1.1, January 22, 1996
Copyright (c) 1996 - 2001 Caldera International, Inc.
All Rights Reserved

Machine's name                                    : Machine's configuration                           : Number of seconds to run each test [2 to 1000]    : Path to disk files                                : 

Starting time:      Fri Feb 12 02:47:13 2016
Projected Run Time: 0:05:00
Projected finish:   Fri Feb 12 02:52:13 2016



------------------------------------------------------------------------------------------------------------
 Test        Test        Elapsed  Iteration    Iteration          Operation
Number       Name      Time (sec)   Count   Rate (loops/sec)    Rate (ops/sec)
------------------------------------------------------------------------------------------------------------
     1 exec_test      


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Ying Huang