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<p class="MsoNormal"><span style="font-size:11.0pt">Hi there, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I’m trying to build a kernel live patch for Linux kernel 4.4.27 version within a docker.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I did use the following link to install necessary dependencies.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><a href="https://github.com/dynup/kpatch">https://github.com/dynup/kpatch</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Since we are building inside docker against an older kernel, my understanding is<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Kpatch-build will try to build older format of live patch using create-kpatch-module.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I do see both original .o and patched .o in the relevant directories inside docker.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729;background:white">But create-kpatch-module is not being called and I'm getting an error
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729;background:white">indicating "Makefile target missing". <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;background:white;vertical-align:baseline">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">Upon further inspection (with -d oputput and from the script itself)<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ /usr/local/libexec/kpatch/create-kpatch-module /home/xyz/.kpatch/tmp/patch/tmp_output.o
/home/xyz/.kpatch/tmp/patch/output.o<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ local to_stdout=1<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ [[ 1 -ge 2 ]]<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ [[ 1 -eq 1 ]]<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ tee -a /home/racker/.kpatch/build.log<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ check_pipe_status create-kpatch-module<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ rc=0<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ [[ 0 = 139 ]]<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ cd /home/xyz/.kpatch/tmp/patch<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ logger<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ KPATCH_BUILD=/source/linux<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ KPATCH_NAME=kpatch-4-4-0-2-modules-0-3-2-3-x86_64<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ KBUILD_EXTRA_SYMBOLS=/usr/lib/modules/4.4.0+2/extra/kpatch/Module.symvers<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ KPATCH_LDFLAGS=<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EFF0F1;vertical-align:baseline"><span style="font-size:10.0pt;font-family:Consolas;color:#242729;border:none windowtext 1.0pt;padding:0in;background:#EFF0F1">+ make</span><span style="font-size:10.0pt;font-family:Consolas;color:#242729"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">This is where it’s failing. The script comparison is with “139” which is SIGSEGV. I don’t see<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">any core files either in the working directory.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Questions are<o:p></o:p></span></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">Is building live patches for older version using docker a good idea?<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">Is building live patch on actual VM instead of docker recommended?<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">Is the Makefile target missing error, known bug? I would like to open a bug<o:p></o:p></span></li></ol>
<p class="MsoNormal" style="margin-left:.25in"><span style="font-size:11.0pt">If possible. Or am I missing something here?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">-Ajey<o:p></o:p></span></p>
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