<div dir="ltr"><div>msan isn't usable without an instrumented C++ standard library.</div><div><br></div><div>The script in question is here:</div><div><a href="https://code.google.com/p/address-sanitizer/source/browse/trunk/build/scripts/slave/buildbot_bootstrap.sh">https://code.google.com/p/address-sanitizer/source/browse/trunk/build/scripts/slave/buildbot_bootstrap.sh</a><br>
</div><div><br></div><div>They appear to use a prebuilt libstdc++ shared object.</div><div><br></div><div>I think the bot usually gives a readable error report, but it doesn't work for this test because the test is passing stderr to FileCheck. Lots of tests do that, and we should find a way to make that work. We might want to pass MSAN_OPTIONS=log_path=/tmp/something.log and then cat that file from lit if it's non-empty.</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Apr 10, 2014 at 12:45 PM, Diego Novillo <span dir="ltr"><<a href="mailto:dnovillo@google.com" target="_blank">dnovillo@google.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br>I recently broke a sanitizer buildbot but I am unable to reproduce the failure. The buildbot that failed is<br>
<br> <a href="http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap/builds/2959" target="_blank">http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap/builds/2959</a><br>
<br><br>I looked around in the logs, looking for the config/build commands that would reproduce the failure. The problem is that the bot seems to be using a script which I don't have access to (buildbot_bootstrap.sh). So, I looked for cmake/ninja calls. AFAICT, the bot does a bootstrap and then runs the testsuite with the final build configured with <font face="courier new, monospace">-DLLVM_USE_SANITIZER=Memory</font>.<br>
<br>I tried that locally, but the build dies very early in tblgen:<br><br><font face="courier new, monospace">FAILED: cd /ssd/dnovillo/llvm/bld/tools/clang/include/clang/Driver && /ssd/dnovillo/llvm/bld/bin/llvm-tblgen -gen-opt-parser-defs -I /ssd/dnovillo/llvm/llvm/tools/clang/include/clang/Driver -I /ssd/dnovillo/llvm/llvm/lib/Target -I /ssd/dnovillo/llvm/llvm/include /ssd/dnovillo/llvm/llvm/tools/clang/include/clang/Driver/Options.td -o /ssd/dnovillo/llvm/bld/tools/clang/include/clang/Driver/Options.inc.tmp<br>
==12630== WARNING: MemorySanitizer: use-of-uninitialized-value<br> #0 0x7f1ea9b01729 (/ssd/dnovillo/llvm/bld/bin/llvm-tblgen+0x8f729)<br> #1 0x7f1ea9a9cbe0 (/ssd/dnovillo/llvm/bld/bin/llvm-tblgen+0x2abe0)<br> #2 0x7f1ea9f7b69c (/ssd/dnovillo/llvm/bld/bin/llvm-tblgen+0x50969c)<br>
#3 0x7f1ea82356ff (/lib/x86_64-linux-gnu/libc.so.6+0x216ff)<br> #4 0x7f1ea9b01280 (/ssd/dnovillo/llvm/bld/bin/llvm-tblgen+0x8f280)<br><br>SUMMARY: MemorySanitizer: use-of-uninitialized-value ??:0 ??<br>Exiting<br>
</font><br>
<div><br></div><div><font face="arial, helvetica, sans-serif">I'm not sure how to proceed from here. The bot is clearly building things in a different way, but I don't know how to duplicate it. Is there a way for me to use the same script that the bot is using? What is the general advice on reproducing buildbot failures?</font></div>
<div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif"><br></font></div><div><font face="arial, helvetica, sans-serif">Thanks. Diego.</font></div></div>
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