Question

When I try to debug my core-dump via gdb either in Qt or directly from terminal, it gives me bunches of warnings like below. Therefore my backtrace is not working properly.

warning: Unable to find libthread_db matching inferior’s thread library, thread debugging will not be available.

warning: Unable to find libthread_db matching inferior’s thread library, thread debugging will not be available.

warning: Could not load shared library symbols for ).
Do you need "set solib-search-path" or "set sysroot"?

Is this because my executable built without debugging symbols or is the problem about glibc? Do you have any solution to fix this?

Answer 1

Is this because my executable built without debugging symbols or is the problem about glibc?

This has nothing to do with your executable.

GDB needs a version of libthread_db.so.1 that matches your libpthread.so.0, and is not finding such version.

Probable causes (from most to least probable):

• You have stripped libpthread.so.0 (don’t do that).
• You’ve upgraded your glibc, but the upgrade was incomplete and did not update libthead_db.so.1
• You are using some kind of cross-compilation environment, and really do need to set solib-search-path or set libthread-db-search-path such that GDB can find a matching libthread_db.so.1

You can see which versions of libthread_db GDB is trying with set debug libthread-db 1.