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POBizarre behavior in gdb
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  1. POBizarre behavior in gdb
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    copied!<p>I'm experiencing a very strange bug in my code.</p> <p>I use a variable <code>m_requestedStructures</code> in my program, and the debugger is accessing the wrong address when inspecting it. For example, I have in the code:</p> <pre><code>qDebug() &lt;&lt; "requested: " &lt;&lt; m_requestedStructures &lt;&lt; " " &lt;&lt; &amp;m_requestedStructures </code></pre> <p>and I set a breakpoint here. When the breakpoint is reached, I compare the printed value and address of <code>m_requestedStructures</code> with those that gdb is accessing:</p> <pre><code>requested: 0 0xfce640 Breakpoint 1 157 qDebug() &lt;&lt; "requested: " &lt;&lt; m_requestedStructures &lt;&lt; " " &lt;&lt; &amp;m_requestedStructures; (gdb) p m_requestedStructures $5 = -1167616 (gdb) p &amp;m_requestedStructures $6 = (int *) 0xfce644 (gdb) </code></pre> <p>As can be seen, both the value and the address differ.</p> <p>Another symptom I'm seeing is that I had a function, <code>QueueManager::checkPopulation_()</code> which I removed quite a while ago, but gdb still tries to tab-complete it, and if I set a breakpoint on it, it will break at the point where the function <em>used</em> to be.</p> <p>It appears to me that the symbols aren't read correctly. I've tried rebuilding from a clean directory, but the problem persists. Does anyone have any idea what might be causing this or how to fix it?</p> <p>Thanks in advance!</p> <p>Edit: I just tried setting a breakpoint on a new function I've added. The function <code>QueueManager::run()</code> appears in gdb's tab complete, but when I try to set the breakpoint, I get</p> <pre><code>the class GlobalSearch::QueueManager does not have any method named run </code></pre> <p>Also, inspecting other variables, both locally scoped and members of QueueManager, seems to work fine.</p> <p>Here is the compiler/linker output. The file containing the class is <code>queuemanager.cpp</code>, which is part of a static library <code>libglobalsearch.a</code>, which is used in a dynamic library <code>xtalopt.so</code>:</p> <pre><code>$ make VERBOSE=1 xtalopt /usr/bin/cmake -H/git/xtalopt-public -B/git/xtalopt-public/build --check-build-system CMakeFiles/Makefile.cmake 0 make -f CMakeFiles/Makefile2 xtalopt make[1]: Entering directory `/git/xtalopt-public/build' /usr/bin/cmake -H/git/xtalopt-public -B/git/xtalopt-public/build --check-build-system CMakeFiles/Makefile.cmake 0 /usr/bin/cmake -E cmake_progress_start /git/xtalopt-public/build/CMakeFiles 63 make -f CMakeFiles/Makefile2 src/xtalopt/CMakeFiles/xtalopt.dir/all make[2]: Entering directory `/git/xtalopt-public/build' make -f src/spglib/CMakeFiles/spglib.dir/build.make src/spglib/CMakeFiles/spglib.dir/depend make[3]: Entering directory `/git/xtalopt-public/build' cd /git/xtalopt-public/build &amp;&amp; /usr/bin/cmake -E cmake_depends "Unix Makefiles" /git/xtalopt-public /git/xtalopt-public/src/spglib /git/xtalopt-public/build /git/xtalopt-public/build/src/spglib /git/xtalopt-public/build/src/spglib/CMakeFiles/spglib.dir/DependInfo.cmake --color= make[3]: Leaving directory `/git/xtalopt-public/build' make -f src/spglib/CMakeFiles/spglib.dir/build.make src/spglib/CMakeFiles/spglib.dir/build make[3]: Entering directory `/git/xtalopt-public/build' make[3]: Nothing to be done for `src/spglib/CMakeFiles/spglib.dir/build'. make[3]: Leaving directory `/git/xtalopt-public/build' /usr/bin/cmake -E cmake_progress_report /git/xtalopt-public/build/CMakeFiles 18 19 20 21 22 23 [ 9%] Built target spglib make -f src/libssh/CMakeFiles/ssh_static.dir/build.make src/libssh/CMakeFiles/ssh_static.dir/depend make[3]: Entering directory `/git/xtalopt-public/build' cd /git/xtalopt-public/build &amp;&amp; /usr/bin/cmake -E cmake_depends "Unix Makefiles" /git/xtalopt-public /git/xtalopt-public/src/libssh /git/xtalopt-public/build /git/xtalopt-public/build/src/libssh /git/xtalopt-public/build/src/libssh/CMakeFiles/ssh_static.dir/DependInfo.cmake --color= make[3]: Leaving directory `/git/xtalopt-public/build' make -f src/libssh/CMakeFiles/ssh_static.dir/build.make src/libssh/CMakeFiles/ssh_static.dir/build make[3]: Entering directory `/git/xtalopt-public/build' make[3]: Nothing to be done for `src/libssh/CMakeFiles/ssh_static.dir/build'. make[3]: Leaving directory `/git/xtalopt-public/build' /usr/bin/cmake -E cmake_progress_report /git/xtalopt-public/build/CMakeFiles 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 [ 33%] Built target ssh_static make -f src/globalsearch/CMakeFiles/globalsearch.dir/build.make src/globalsearch/CMakeFiles/globalsearch.dir/depend make[3]: Entering directory `/git/xtalopt-public/build' cd /git/xtalopt-public/build &amp;&amp; /usr/bin/cmake -E cmake_depends "Unix Makefiles" /git/xtalopt-public /git/xtalopt-public/src/globalsearch /git/xtalopt-public/build /git/xtalopt-public/build/src/globalsearch /git/xtalopt-public/build/src/globalsearch/CMakeFiles/globalsearch.dir/DependInfo.cmake --color= make[3]: Leaving directory `/git/xtalopt-public/build' make -f src/globalsearch/CMakeFiles/globalsearch.dir/build.make src/globalsearch/CMakeFiles/globalsearch.dir/build make[3]: Entering directory `/git/xtalopt-public/build' /usr/bin/cmake -E cmake_progress_report /git/xtalopt-public/build/CMakeFiles [ 33%] Building CXX object src/globalsearch/CMakeFiles/globalsearch.dir/queuemanager.cpp.o cd /git/xtalopt-public/build/src/globalsearch &amp;&amp; /usr/bin/c++ -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_PLUGIN -DQT_SHARED -D_HAVE_EXECINFO_H_ -DQT_DEBUG -fPIC -g -I/usr/include/QtOpenGL -I/usr/include/QtGui -I/usr/include/QtCore -I/usr/include/eigen2 -I/git/xtalopt-public/build -I/usr/include/openbabel-2.0 -I/git/xtalopt-public/src -o CMakeFiles/globalsearch.dir/queuemanager.cpp.o -c /git/xtalopt-public/src/globalsearch/queuemanager.cpp Linking CXX static library libglobalsearch.a cd /git/xtalopt-public/build/src/globalsearch &amp;&amp; /usr/bin/cmake -P CMakeFiles/globalsearch.dir/cmake_clean_target.cmake cd /git/xtalopt-public/build/src/globalsearch &amp;&amp; /usr/bin/cmake -E cmake_link_script CMakeFiles/globalsearch.dir/link.txt --verbose=1 /usr/bin/ar cr libglobalsearch.a CMakeFiles/globalsearch.dir/optbase.cpp.o CMakeFiles/globalsearch.dir/queuemanager.cpp.o CMakeFiles/globalsearch.dir/structure.cpp.o CMakeFiles/globalsearch.dir/tracker.cpp.o CMakeFiles/globalsearch.dir/optimizer.cpp.o CMakeFiles/globalsearch.dir/bt.cpp.o CMakeFiles/globalsearch.dir/sshconnection.cpp.o CMakeFiles/globalsearch.dir/sshmanager.cpp.o CMakeFiles/globalsearch.dir/random.cpp.o CMakeFiles/globalsearch.dir/ui/abstractdialog.cpp.o CMakeFiles/globalsearch.dir/ui/abstracttab.cpp.o CMakeFiles/globalsearch.dir/moc_optbase.cxx.o CMakeFiles/globalsearch.dir/moc_queuemanager.cxx.o CMakeFiles/globalsearch.dir/moc_structure.cxx.o CMakeFiles/globalsearch.dir/moc_tracker.cxx.o CMakeFiles/globalsearch.dir/moc_optimizer.cxx.o CMakeFiles/globalsearch.dir/moc_bt.cxx.o CMakeFiles/globalsearch.dir/moc_sshconnection.cxx.o CMakeFiles/globalsearch.dir/moc_sshmanager.cxx.o CMakeFiles/globalsearch.dir/moc_random.cxx.o CMakeFiles/globalsearch.dir/ui/moc_abstractdialog.cxx.o CMakeFiles/globalsearch.dir/ui/moc_abstracttab.cxx.o /usr/bin/ranlib libglobalsearch.a make[3]: Leaving directory `/git/xtalopt-public/build' /usr/bin/cmake -E cmake_progress_report /git/xtalopt-public/build/CMakeFiles 1 2 3 4 5 6 7 8 9 10 11 12 13 14 [ 55%] Built target globalsearch make -f src/xtalopt/CMakeFiles/xtalopt.dir/build.make src/xtalopt/CMakeFiles/xtalopt.dir/depend make[3]: Entering directory `/git/xtalopt-public/build' cd /git/xtalopt-public/build &amp;&amp; /usr/bin/cmake -E cmake_depends "Unix Makefiles" /git/xtalopt-public /git/xtalopt-public/src/xtalopt /git/xtalopt-public/build /git/xtalopt-public/build/src/xtalopt /git/xtalopt-public/build/src/xtalopt/CMakeFiles/xtalopt.dir/DependInfo.cmake --color= make[3]: Leaving directory `/git/xtalopt-public/build' make -f src/xtalopt/CMakeFiles/xtalopt.dir/build.make src/xtalopt/CMakeFiles/xtalopt.dir/build make[3]: Entering directory `/git/xtalopt-public/build' Linking CXX shared library xtalopt.so cd /git/xtalopt-public/build/src/xtalopt &amp;&amp; /usr/bin/cmake -E cmake_link_script CMakeFiles/xtalopt.dir/link.txt --verbose=1 /usr/bin/c++ -fPIC -fPIC -g -shared -Wl,-soname,xtalopt.so -o xtalopt.so CMakeFiles/xtalopt.dir/extension.cpp.o CMakeFiles/xtalopt.dir/xtalopt.cpp.o CMakeFiles/xtalopt.dir/genetic.cpp.o CMakeFiles/xtalopt.dir/structures/xtal.cpp.o CMakeFiles/xtalopt.dir/optimizers/xtaloptoptimizer.cpp.o CMakeFiles/xtalopt.dir/optimizers/vasp.cpp.o CMakeFiles/xtalopt.dir/optimizers/gulp.cpp.o CMakeFiles/xtalopt.dir/optimizers/pwscf.cpp.o CMakeFiles/xtalopt.dir/optimizers/castep.cpp.o CMakeFiles/xtalopt.dir/testing/xtalopttest.cpp.o CMakeFiles/xtalopt.dir/ui/dialog.cpp.o CMakeFiles/xtalopt.dir/ui/tab_init.cpp.o CMakeFiles/xtalopt.dir/ui/tab_edit.cpp.o CMakeFiles/xtalopt.dir/ui/tab_opt.cpp.o CMakeFiles/xtalopt.dir/ui/tab_sys.cpp.o CMakeFiles/xtalopt.dir/ui/tab_progress.cpp.o CMakeFiles/xtalopt.dir/ui/tab_plot.cpp.o CMakeFiles/xtalopt.dir/ui/tab_log.cpp.o CMakeFiles/xtalopt.dir/moc_extension.cxx.o CMakeFiles/xtalopt.dir/moc_xtalopt.cxx.o CMakeFiles/xtalopt.dir/moc_genetic.cxx.o CMakeFiles/xtalopt.dir/structures/moc_xtal.cxx.o CMakeFiles/xtalopt.dir/optimizers/moc_xtaloptoptimizer.cxx.o CMakeFiles/xtalopt.dir/optimizers/moc_vasp.cxx.o CMakeFiles/xtalopt.dir/optimizers/moc_gulp.cxx.o CMakeFiles/xtalopt.dir/optimizers/moc_pwscf.cxx.o CMakeFiles/xtalopt.dir/optimizers/moc_castep.cxx.o CMakeFiles/xtalopt.dir/testing/moc_xtalopttest.cxx.o CMakeFiles/xtalopt.dir/ui/moc_dialog.cxx.o CMakeFiles/xtalopt.dir/ui/moc_tab_init.cxx.o CMakeFiles/xtalopt.dir/ui/moc_tab_edit.cxx.o CMakeFiles/xtalopt.dir/ui/moc_tab_opt.cxx.o CMakeFiles/xtalopt.dir/ui/moc_tab_sys.cxx.o CMakeFiles/xtalopt.dir/ui/moc_tab_progress.cxx.o CMakeFiles/xtalopt.dir/ui/moc_tab_plot.cxx.o CMakeFiles/xtalopt.dir/ui/moc_tab_log.cxx.o -lavogadro ../globalsearch/libglobalsearch.a ../spglib/libspglib.a -lQtOpenGL -lGLU -lGL -lSM -lICE -lX11 -lXext -lopenbabel -lQtGui -lQtCore ../libssh/libssh_static.a -lnsl -lresolv -lrt -lz -lssl -lcrypto make[3]: Leaving directory `/git/xtalopt-public/build' /usr/bin/cmake -E cmake_progress_report /git/xtalopt-public/build/CMakeFiles 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 [100%] Built target xtalopt make[2]: Leaving directory `/git/xtalopt-public/build' /usr/bin/cmake -E cmake_progress_start /git/xtalopt-public/build/CMakeFiles 0 make[1]: Leaving directory `/git/xtalopt-public/build' </code></pre>
 

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