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<p class="MsoNormal">So im trying to write a core handler program and use lldb to attach and dump important information about it. This works if a use my tool to attach to an existing one but I found that lldb-server will hang in a waitpid call if the kernel
has invoked the tool after another process has cored.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Example:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>/proc/sys/kernel/core_pattern is set to |/opt/core_tool<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Run a.out and it segfaults<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>Kernel invokes core_tool that uses lldb AttachToProcess and a.out is in state “S+”<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>lldb-server hangs in source\Plugins\Process\Linux\NativeProcessLinux.cpp:867<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>if I remove the waitpid it doesn’t hang but fails to attach<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Looks like gdb had a similar problem as well: http://www.sourceware.org/ml/gdb-patches/2008-04/msg00224.html<o:p></o:p></p>
<p class="MsoNormal">Any ideas on how to fix this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Cambria",serif;color:#4F81BD">Mark Chandler<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Cambria",serif;color:#4F81BD">Battle.Net Engineering Systems | Blizzard Entertainment<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Cambria",serif;color:#7F7F7F">(P)
</span></b><span style="font-size:9.0pt;font-family:"Cambria",serif;color:#7F7F7F">949-955-1380 x15353<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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