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Ganesh Kumar N M wrote:
<blockquote cite="mid:004c01c92f92$bca991d0$0d01a8c0@signet" type="cite">
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<div><strong><font face="Courier New" size="2">Hi All,</font></strong></div>
<div><strong></strong> </div>
<div><strong><font face="Courier New" size="2"> I'm working on
MPC860 with Montavista linux 2.4.18</font></strong></div>
<div><strong><font face="Courier New" size="2">We have a Linux kernel
loadable module which on loading</font></strong></div>
<div><strong><font face="Courier New" size="2">panicks after some
random time say 8 hours, 4 hours or so</font></strong></div>
<div><strong><font face="Courier New" size="2">the oops outputs say
either machine check exception or </font></strong></div>
<div><strong><font face="Courier New" size="2">kernel stack overflow
(randomly both show up) a</font></strong><strong><font
face="Courier New" size="2">re as below:</font></strong> </div>
</blockquote>
I don't know for sure what could be causing your problem. I can only
suggest some patches that have helped us in the past.<br>
<br>
I'm not familiar with Montavista's kernel versions; but I know our
2.4.24 kernel did not have the 'separate I-TLB error and miss handling'
patch (
<a class="moz-txt-link-freetext" href="http://ozlabs.org/pipermail/linuxppc-embedded/2005-January/016382.html">http://ozlabs.org/pipermail/linuxppc-embedded/2005-January/016382.html</a>
) which caused our applications to segfault for not apparent reason. <br>
<br>
I also suggest applying the CPU15 fix (
<a class="moz-txt-link-freetext" href="http://git.denx.de/?p=linuxppc_2_4_devel.git;a=commit;h=baf9a6caca75b1f338ae370669e5882809000164">http://git.denx.de/?p=linuxppc_2_4_devel.git;a=commit;h=baf9a6caca75b1f338ae370669e5882809000164</a>
and
<a class="moz-txt-link-freetext" href="http://git.denx.de/?p=linuxppc_2_4_devel.git;a=commit;h=3ad403717f1d9c6a09ec41a5b016ac5245591122">http://git.denx.de/?p=linuxppc_2_4_devel.git;a=commit;h=3ad403717f1d9c6a09ec41a5b016ac5245591122</a>
) and enabling it temporarily to see if the problem could be the
unlucky placement of a branch instruction at the end of a page; but
evaluate the performance of your application carefully if you are
considering running production code with the patch enabled as it
introduces significant overhead.<br>
<br>
Regards,<br>
<br>
Ben Gardiner<br>
Nanometrics Seismological Instruments<br>
250 Herzberg Rd., Kanata, ON, CA, K2K 2A1<br>
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