free_task_struct() called too early?

Chen, Kenneth W (kenneth.w.chen@intel.com)
Fri, 10 Aug 2001 11:13:53 -0700


When a process terminates, it appears that the task structure is freed too
early. There are memory references to the kernel task area (task_struct and
stack space) after free_task_struct(p) is called.

If I modify the following line in include/asm-i386/processor.h

#define free_task_struct(p) free_pages((unsigned long) (p), 1) to
#define free_task_struct(p) memset((void*) (p), 0xf, PAGE_SIZE*2);
free_pages((unsigned long) (p), 1)
then kernel will boot to init and lockup on when first task terminates.

Has anyone looked into or aware of this issue?

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