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Asked: 2026-05-27T08:59:07+00:00

Good morning, I am trying to use the Valgrind debugger to step through a

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Good morning, I am trying to use the Valgrind debugger to step through a program.

My valgrind command line is valgrind -tool memcheck --leak-check=full --db-enable=yes ./MatchUpAcurate.exe.

I am using valgrind-3.5.0 on Centos Linux release 5.5 with gdb version 7,0.1-23.el5_5.2.

I enter Yes when valgrind asks the question Attach to Debugger. Then, the valgrind debugger returns with: 4428: return new tuple2<int,A>(2, i++, p->next());

When I try to use the gdb step or continue command, valgrind says

[New Thread 0x410fd10 (LWP 6548] Cannot find user-level thread for LWP 6551: generic error.

When I try to use valgrind --single-step=yes debugger option on the valgrind command-line, valgriind says Bad option aborting.

Could any valgrind users show me how to step through C++ source code or continue through a program? Thank you.

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1 Answer

  1. Editorial Team

    You can also get vgdb in the 3.7.0 release. From the release notes:

    • GDB server: Valgrind now has an embedded GDB server. That means it
      is possible to control a Valgrind run from GDB, doing all the usual
      things that GDB can do (single stepping, breakpoints, examining
      data, etc). Tool-specific functionality is also available. For
      example, it is possible to query the definedness state of variables
      or memory from within GDB when running Memcheck; arbitrarily large
      memory watchpoints are supported, etc. To use the GDB server, start
      Valgrind with the flag –vgdb-error=0 and follow the on-screen
      instructions.

    There’s more info in the valgrind online manual.

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