When I mounted nfs on my target, the kernel crashed. And I found it
was caused by stack overflow. When I digged into it.
And I found not only "setgroups.c" but
"getgroups.c" have the matrix (__kernel_gid_t kernel_groups[n]) on the
stack which can be very large because "n" can be assigned to
NGROUPS_MAX.
And, NGROUPS_MAX is defined in the file "./linux-2.6.x/include/linux/limits.h"
#define NGROUPS_MAX 65536 /* supplemental group IDs are available */
I also changed it to do malloc.
