From: William Lee Irwin III The stack is now shared with struct thread_info on most arches, not task_t. This mostly affects get_wchan() and stack usage debug. --- 25-akpm/arch/m68knommu/kernel/process.c | 2 +- 1 files changed, 1 insertion(+), 1 deletion(-) diff -puN arch/m68knommu/kernel/process.c~m68knommu-stack-bounds-checking arch/m68knommu/kernel/process.c --- 25/arch/m68knommu/kernel/process.c~m68knommu-stack-bounds-checking 2004-04-17 01:11:52.737109656 -0700 +++ 25-akpm/arch/m68knommu/kernel/process.c 2004-04-17 01:11:52.740109200 -0700 @@ -415,7 +415,7 @@ unsigned long get_wchan(struct task_stru stack_page = (unsigned long)p; fp = ((struct switch_stack *)p->thread.ksp)->a6; do { - if (fp < stack_page+sizeof(struct task_struct) || + if (fp < stack_page+sizeof(struct thread_info) || fp >= 8184+stack_page) return 0; pc = ((unsigned long *)fp)[1]; _