I comfirm that setuid(0) fixes my issue! Thank you for your advise.
I made a small patch of the workaround for nvidia-modprobe.
Please check the attached file.
The configuration in /etc/modprobe.d/nvidia.conf requires
to fork /bin/sh with root privilege because it contains some shell commands.
So, I think this issue affects to most of users.
Regards,
Hiromasa YOSHIMOTO
--- nvidia-modprobe-384.111.orig/modprobe-utils/nvidia-modprobe-utils.c
+++ nvidia-modprobe-384.111/modprobe-utils/nvidia-modprobe-utils.c
@@ -374,6 +374,10 @@ static int modprobe_helper(const int pri
*/
silence_current_process();
+ /* Workaround for debian's /etc/modprobe.d/nvidia.conf configuration.
+ * See Bug#888952 for details */
+ setuid(0);
+
execle(modprobe_path, "modprobe",
module_name, NULL, envp);
