From: "D. Deryl Downey" <me@...>
Date: 2013-03-12T05:30:07+09:00
Subject: Re: Segmentation fault while compiling ruby 1.9.3p392 with OpenSSL 1.0.1e installed

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SIG11 is not _usually_ a hardware error, though it can be related to 
memory issues. A SIG11 can be thrown when something tries to read or 
write to a memory area it doesn't have permissions on OR when it does 
and the area is corrupt. (Usually caused when memory cells have gone bad 
on individual sticks). Also happens when the addresses on the stack have 
become corrupt, again usually due to bad cells on the/a memory stick. 
The main issue though is that the pointer to a memory location is invalid.

Run up against this so many times over the last 15+ years of computing, 
its not funny. In *some* cases, swapping out memory sticks has solved 
the issue.

*That being said*, the most common issue that raises SIG11s are bugs in 
programs. (Bad pointer math, etc) There is no real way, short of testing 
your individual memory sticks in a hardware based memory tester (not 
something like mem86+ or Microscope), to determine if its specifically 
your memory or a bug in the software. There are subsystems that can 
throw this, hardware based, like overclocking memory and/or CPUs.

However, the vast majority of SIG11s thrown are due to bugs in programs, 
not hardware. Just don't totally discount hardware, is the point.





> Robert Klemme <mailto:shortcutter@googlemail.com>
> March 11, 2013 3:58 PM
>
> Signal 11 is SIGSEGV (segmentation fault). That has nothing to do
> with hardware - unless you want to suggest that the MMU is involved in
> the process. This typically happens when dereferencing null pointers.
>
> Piotr, I'd start with simpler options - typically you do not need the
> sudo's for configuring and compiling. Also I'd omit the architecture
> unless you are cross compiling.
>
> ./configure --prefix=/usr/local/
> make
> sudo make install
>
> Kind regards
>
> robert
>
> Miroslaw Niegowski <mailto:trednu@gmail.com>
> March 9, 2013 12:35 PM
>
> Hi,
> signal 11 suggests a hardware error and is not related to software. I 
> would check ram first.
>

-- 
D. Deryl Downey

  "The bug which you would fright me with I seek" - William Shakespeare 
- The Winter's Tale, Act III, Scene II - A court of Justice.

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<html><head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
</head><body bgcolor="#FFFFFF" text="#000000">SIG11 is not _usually_ a 
hardware error, though it can be related to memory issues. A SIG11 can 
be thrown when something tries to read or write to a memory area it 
doesn't have permissions on OR when it does and the area is corrupt. 
(Usually caused when memory cells have gone bad on individual sticks). 
Also happens when the addresses on the stack have become corrupt, again 
usually due to bad cells on the/a memory stick. The main issue though is
 that the pointer to a memory location is invalid.<br>
<br>
Run up against this so many times over the last 15+ years of computing, 
its not funny. In *some* cases, swapping out memory sticks has solved 
the issue.<br>
<br>
*That being said*, the most common issue that raises SIG11s are bugs in 
programs. (Bad pointer math, etc) There is no real way, short of testing
 your individual memory sticks in a hardware based memory tester (not 
something like mem86+ or Microscope), to determine if its specifically 
your memory or a bug in the software. There are subsystems that can 
throw this, hardware based, like overclocking memory and/or CPUs.<br>
<br>
However, the vast majority of SIG11s thrown are due to bugs in programs,
 not hardware. Just don't totally discount hardware, is the point.<br>
<br>
<br>
<br>
<br>
<br>
<blockquote style="border: 0px none;" 
cite="mid:CAM9pMnMZiYKkWfWdNgNHU-1QN6Fu-Eby+sRX+RKdMsXsDQPZGg@mail.gmail.com"
 type="cite">
  <div style="margin:30px 25px 10px 25px;" class="__pbConvHr"><div 
style="display:table;width:100%;border-top:1px solid 
#EDEEF0;padding-top:5px"> 	<div 
style="display:table-cell;vertical-align:middle;padding-right:6px;"><img
 photoaddress="shortcutter@googlemail.com" photoname="Robert Klemme" 
src="cid:part1.00020207.07040400@daviddwdowney.com" 
name="postbox-contact.jpg" height="25px" width="25px"></div>   <div 
style="display:table-cell;white-space:nowrap;vertical-align:middle;width:100%">
   	<a moz-do-not-send="true" href="mailto:shortcutter@googlemail.com" 
style="color:#737F92 
!important;padding-right:6px;font-weight:bold;text-decoration:none 
!important;">Robert Klemme</a></div>   <div 
style="display:table-cell;white-space:nowrap;vertical-align:middle;">   
  <font color="#9FA2A5"><span style="padding-left:6px">March 11, 2013 
3:58 PM</span></font></div></div></div>
  <div style="color:#888888;margin-left:24px;margin-right:24px;" 
__pbrmquotes="true" class="__pbConvBody"><div><!----><br>Signal 11 is 
SIGSEGV (segmentation fault).  That has nothing to do<br>with hardware -
 unless you want to suggest that the MMU is involved in<br>the process. 
 This typically happens when dereferencing null pointers.<br><br>Piotr, 
I'd start with simpler options - typically you do not need the<br>sudo's
 for configuring and compiling.  Also I'd omit the architecture<br>unless
 you are cross compiling.<br><br>./configure --prefix=/usr/local/<br>make<br>sudo
 make install<br><br>Kind regards<br><br>robert<br><br></div></div>
  <div style="margin:30px 25px 10px 25px;" class="__pbConvHr"><div 
style="display:table;width:100%;border-top:1px solid 
#EDEEF0;padding-top:5px"> 	<div 
style="display:table-cell;vertical-align:middle;padding-right:6px;"><img
 photoaddress="trednu@gmail.com" photoname="Miroslaw Niegowski" 
src="cid:part2.05020703.03060709@daviddwdowney.com" 
name="compose-unknown-contact.jpg" height="25px" width="25px"></div>   <div
 
style="display:table-cell;white-space:nowrap;vertical-align:middle;width:100%">
   	<a moz-do-not-send="true" href="mailto:trednu@gmail.com" 
style="color:#737F92 
!important;padding-right:6px;font-weight:bold;text-decoration:none 
!important;">Miroslaw Niegowski</a></div>   <div 
style="display:table-cell;white-space:nowrap;vertical-align:middle;">   
  <font color="#9FA2A5"><span style="padding-left:6px">March 9, 2013 
12:35 PM</span></font></div></div></div>
  <div style="color:#888888;margin-left:24px;margin-right:24px;" 
__pbrmquotes="true" class="__pbConvBody"><p>Hi, <br>
signal 11 suggests a hardware error and is not related to software. I 
would check ram first. </p>


  </div>
</blockquote>
<br>
<div class="moz-signature">-- <br>D. Deryl Downey<br>


<br>


 "The bug which you would fright me with I seek" - William 
Shakespeare - The Winter's Tale, Act III, Scene II - A court of Justice.</div>
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