How to switch to inactive threads in cuda-gdb?

After hitting a breakpoint in a kernel in cuda-gdb, I tried to switch to a thread not within the current warp of execution, and failed. In such a case, how should I switch my focus?

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Hello Ziqi - to help us reproduce this issue, could you show a cut/paste of the output of CUDA GDB when you hit the breakpoint, the command you used to switch threads, and the output from CUDA GDB for that command?

Can you also show us the output of the following command:

info cuda threads