linux-kernel - How to identify the cause of " BUG: Bad page map in process python ..." kernel errors?

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Message-ID: <CAHhAz+hJJnf=Q09LrY4Zj3g_QA1UeYwuHdDd8=qZor0B7Q6pEA@mail.gmail.com>
Date:   Wed, 18 Jan 2017 23:07:56 +0530
From:   Muni Sekhar <munisekharrms@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: How to identify the cause of " BUG: Bad page map in process python
 ..." kernel errors?

Hi All,

I am observing the following statements in the kernel log while
running driver soak tests:

[ 8350.824403] BUG: Bad page map in process python  pte:000000c0 pmd:950a5067

[ 8351.457234] BUG: Bad page map in process python
pte:3400000000000c0 pmd:950a5067

[ 8351.458469] BUG: Bad page map in process python
pte:406486b3be206e97 pmd:950a5067

….

[ 8353.266053] BUG: Bad page map in process python
pte:406486b3fb696e97 pmd:950a5067

[ 8353.305982] BUG: Bad page map in process python  pte:000000c0 pmd:950a5067

[ 8355.738440] BUG: Bad rss-counter state mm:ffff880138fa7100 idx:1 val:259

[ 8374.905314] general protection fault: 0000 [#1] SMP

In the kernel log, I observed that kernel reported 60 " BUG: Bad page
map in process python ..." reports and 1 “BUG: Bad rss-counter state”
and finally it crashed with “general protection fault”.

I would like to know what does it mean by “BUG: Bad page map in
process python ...” and how to identify the cause of it?

To debug this, do I need to consider the “general protection fault”
stack trace or the first “BUG: Bad page map in process …” stack trace?

-- 
Thanks,
Sekhar