There was recent commit[1] to rename the "thread_info" member of the task_struct to "stack": - struct thread_info *thread_info; + void *stack; To resolve it we simply need to change the hardcoded value for the offset lookup in task.c: --- task.c.ori 2007-05-24 09:54:43.000000000 -0600 +++ task.c 2007-05-24 10:41:50.000000000 -0600 @@ -161,7 +161,7 @@ task_init(void) } MEMBER_OFFSET_INIT(task_struct_thread_info, "task_struct", - "thread_info"); + "stack"); if (VALID_MEMBER(task_struct_thread_info)) { MEMBER_OFFSET_INIT(thread_info_task, "thread_info", "task"); MEMBER_OFFSET_INIT(thread_info_cpu, "thread_info", "cpu"); However, I'm not sure what the best way to keep backwards compatibility for kernels < 2.6.22. Troy [1] f7e4217b007d1f73e7e3cf10ba4fea4a608c603f