I can reproduce the error. But note the debug version sample run fail directly without cuda-gdb.
local-veraj@ipp2-0051:~/cutlass/examples/examples/48_hopper_warp_specialized_gemm$ /usr/local/cuda-12.6/bin/cuda-gdb ./48_hopper_warp_specialized_gemm
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Reading symbols from ./48_hopper_warp_specialized_gemm…
(cuda-gdb) r
Starting program: /localhome/local-veraj/cutlass/examples/examples/48_hopper_warp_specialized_gemm/48_hopper_warp_specialized_gemm
[Thread debugging using libthread_db enabled]
Using host libthread_db library “/lib/x86_64-linux-gnu/libthread_db.so.1”.
[New Thread 0x7ffff43ff000 (LWP 4065)]
[New Thread 0x7ffff2fff000 (LWP 4066)]
[Detaching after fork from child process 4067]
[New Thread 0x7ffff1383000 (LWP 4077)]
warning: Cuda API error detected: cudaLaunchKernelExC returned (0x2)
warning: Cuda API error detected: cudaGetLastError returned (0x2)
Got cutlass error: Error Internal at: 415
[Thread 0x7ffff2fff000 (LWP 4066) exited]
[Thread 0x7ffff1383000 (LWP 4077) exited]
[Thread 0x7ffff43ff000 (LWP 4065) exited]
[Inferior 1 (process 4061) exited with code 01]
(cuda-gdb) exit
local-veraj@ipp2-0051:~/cutlass/examples/examples/48_hopper_warp_specialized_gemm$ ./48_hopper_warp_specialized_gemm
Got cutlass error: Error Internal at: 415
So this is not an issue for cuda-gdb.
This is related with cutlass. Can you please check with cutlass team in the github directly ?