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Based on the description you provided, gdb (the low-level debugger that is a part of the toolchain) fails to evaluate the variable shown on the screenshot. This could be caused by a bug in gdb or some configuration issues. We would advise enabling gdb logging as shown on this page and confirming that gdb never replies to the -var-create command. If this is the case, please try using a different version of gdb, or avoid evaluating the variable that triggers the gdb bug.