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Date:   Fri, 20 Jul 2012 11:16:02 +0200
From:   Ralf Baechle <ralf@linux-mips.org>
To:     kr kr <kr-jiffy@yandex.ru>
Cc:     linux-mips@linux-mips.org
Subject: Re: [mips32r1 cpu] Advice needed: "Machine Check exception - caused
 by multiple matching entries in the TLB"
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On Fri, Jul 13, 2012 at 12:03:25AM +0400, kr kr wrote:

> [   12.560000] Kernel panic - not syncing: Caught Machine Check exception - caused by multiple matching entries in the TLB.

Running userland should never result in crashing the kernel except if
programs directly touch I/O hardware an do stupid things or abuse their
root priviledges..

This type of crash specifically has in the past been produced by incorrect
hazard barriers but also CPU hardware bugs so you may want to review the
kernel code against a CPU datasheet and errata documentation.  As always
with hardware that is only supported out of tree we can't be too helpful ...

  Ralf