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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Hi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">We found Google performance tools, TCMALLOC_DEBUG to be very effective to track down memory corruption.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">You need to link your code with TCMALLOC_DEBUG option. The exe will then crash everytime there is a potential memory issue. We were
able to fix quite a few issues running the exe in this mode.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">The exe will run slow and also use more RAM. So please make sure the use case you use to narrow down can run without consuming a
lot of memory.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Check gperftools in code.google.com.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Sundari.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">
</span><span lang="EN-US" style="font-size:11.0pt;font-family:"MS Gothic"">姜</span><span style="font-size:11.0pt;font-family:"Microsoft JhengHei","sans-serif"">维</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> [mailto:sdjiangwei@gmail.com]
<br>
<b>Sent:</b> 28 March 2013 06:52<br>
<b>To:</b> Jingdong Sun<br>
<b>Cc:</b> omniorb-list@omniorb-support.com<br>
<b>Subject:</b> Re: [omniORB] Memory corruption when using omniORB 4.1.4 with SLES 11 64-bit<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">It's very likely <span style="font-family:"Arial","sans-serif"">to be a</span> bug in your code.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">2013/3/28 Jingdong Sun <<a href="mailto:jindong@us.ibm.com" target="_blank">jindong@us.ibm.com</a>><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Arial","sans-serif"">Hi, There,</span>
<br>
<br>
<span style="font-family:"Arial","sans-serif"">I am using omniORB 4.1.4 with my project.</span>
<br>
<span style="font-family:"Arial","sans-serif"">Recently, when I testing with SLES, I noticed that, the server side hit memory corruption some time (not always).</span>
<br>
<br>
<span style="font-family:"Arial","sans-serif"">With ORBtraceLevel set to 45, I got following trace information:</span>
<br>
<span style="font-family:"Courier New"">omniORB: (7) inputMessage: from giop:tcp:[::ffff:10.6.25.60]:56354 2048 bytes</span>
<br>
<span style="font-family:"Courier New"">omniORB: (7) </span><br>
<span style="font-family:"Courier New"">4749 4f50 0102 0300 6467 0000 0a00 0000 GIOP....dg......</span>
<br>
<span style="font-family:"Courier New"">0300 0000 0000 0000 0e00 0000 fed6 ef51 ...............Q</span>
<br>
<span style="font-family:"Courier New"">5100 0034 2e00 0000 0000 6f72 0800 0000 Q..4......or....</span>
<br>
<span style="font-family:"Courier New"">7374 6172 7450 4500 0000 0000 2234 3522 startPE....."45"</span>
<br>
<span style="font-family:"Courier New"">2e67 0000 3c3f 786d 6c20 7665 7273 696f .g..<?xml versio</span>
<br>
<span style="font-family:"Courier New"">6e3d 2231 2e30 2220 656e 636f 6469 6e67 n="1.0" encoding</span>
<br>
<span style="font-family:"Courier New"">3d22 5554 462d 3822 2073 7461 6e64 616c ="UTF-8" standal</span>
<br>
<span style="font-family:"Courier New"">6f6e 653d 226e 6f22 203f 3e0a 3c61 7567 one="no" ?>.<aug</span>
<br>
<span style="font-family:"Default Sans
Serif","serif"">(Jingdong: I skipped some lines here......)</span>
<br>
<span style="font-family:"Courier New"">2020 3c74 743a 6174 7472 206e 616d 653d <tt:attr name=</span>
<br>
<span style="font-family:"Courier New"">omniORB: (7) inputCopyChunk: from giop:tcp:[::ffff:10.6.25.60]:56354 24432 bytes</span>
<br>
<span style="font-family:"Courier New"">omniORB: (7) </span><br>
<span style="font-family:"Courier New"">2263 6861 696e 4964 2220 7479 7065 3d22 "chainId" type="</span>
<br>
<span style="font-family:"Courier New"">696e 7433 3222 2f3e 0a20 2020 2020 203c int32"/>. <</span>
<br>
<span style="font-family:"Default Sans
Serif","serif"">(Jingdong: I skipped some lines here too.....)</span>
<br>
<span style="font-family:"Default Sans
Serif","serif"">(Jingdong: following part is corrupted, not the contents as I expected).</span>
<br>
<span style="font-family:"Courier New"">3020 3820 3020 3020 3020 3020 3120 3120 0 8 0 0 0 0 1 1
</span><br>
<span style="font-family:"Courier New"">3020 3020 3020 3120 3120 340a 3120 3435 0 0 0 1 1 4.1 45</span>
<br>
<span style="font-family:"Courier New"">omniORB: (7) inputMessage: from giop:tcp:[::ffff:10.6.25.60]:56354 18 bytes</span>
<br>
<span style="font-family:"Courier New"">omniORB: (7) </span><br>
<span style="font-family:"Courier New"">4749 4f50 0102 0107 0600 0000 0a00 0000 GIOP............</span>
<br>
<span style="font-family:"Courier New"">0a00 </span> <br>
<br>
<span style="font-family:"Arial","sans-serif"">What I noticed are:</span> <br>
<span style="font-family:"Arial","sans-serif"">1. The memory corruption problem not happened all the time, and when problem happened, generally the 2nd try will pass.</span>
<br>
<span style="font-family:"Arial","sans-serif"">2. All corruptions happened to me so far were related to relative big data (about 24K), and it happened related to "inputCopyChunk" as trace shown above.</span>
<br>
<span style="font-family:"Arial","sans-serif"">3. The size server side got is correct, even the content got corrupted. (The size 24432 bytes is correct in the example I copied here)</span>
<br>
<span style="font-family:"Courier New"">omniORB: (7) inputCopyChunk: from giop:tcp:[::ffff:10.6.25.60]:56354 24432 bytes</span>
<br>
<span style="font-family:"Arial","sans-serif"">4. When corruption happened, sometimes the content just got truncated, sometimes the contents just replaced by some meaningless contents at the end.</span>
<br>
<br>
<span style="font-family:"Arial","sans-serif"">Please help me.</span> <br>
<span style="font-family:"Arial","sans-serif"">Thanks.</span> <br>
<span class="hoenzb"><span style="font-family:"Arial","sans-serif";color:#888888">Jingdong Sun</span></span><span style="font-family:"Arial","sans-serif";color:#888888"><br>
<span class="hoenzb">InfoSphere Streams Development</span><br>
<span class="hoenzb">Phone 507 253-5958 (T/L 553-5958) </span><br>
<span class="hoenzb"><a href="mailto:jindong@us.ibm.com" target="_blank">jindong@us.ibm.com</a></span></span><br>
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