Currently, when fdset_new_fill() fails to open /proc/self/fd or encounters an error while processing individual file descriptors (such as fcntl or fstat failures), it returns a silent error code. For debugging rarely reproducible failures it becomes difficult to know the exact cause of failure This commit updates the function to use log_debug_errno() for all error paths and hence provides better visibility into why FD collection failed, including the path of the problematic FD (via fd_get_path) and its inode type.
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