Hi All: I am porting Linux to my r3000 cpu now and meet with a problem when the init program is running. When the init process (pid=1) forks the first child (pid=7), the parent process called copy_thread( ) which did the following assignment: childregs->regs[29] = usp ( Here, usp is the parent's stack pointer) (see arch/mips/kerenel/process.c). So, the child and the parent share the same stack. After the fork, the parent called write_utmp_wtmp( ) which then called memset(&utmp,0,sizeof(utmp)) and erased the stack. As we know, this stack is shared by the parent and the child, the child will die when the child is scheduled to run because the contents of the stack are all zeros. I think the stack should not be shared by the parent and the child after anyone tries to modify the stack, that is, the child and parent should have separete stacks. I searched the code and could not find the place where the separation is given. Any help would be greatly appreciated. Thanks, Steven Liu
