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SubjectRe: [patch] fixed both processes in D state and the /proc/ oopses [Re: [patch] Fixed the race that was oopsing Linux-2.2.0]

On Thu, 28 Jan 1999 10:17:37 -0800 (PST), Linus Torvalds
<> said:

> I'd much rather just use some stale "struct task_struct" data.

The problem isn't the risk of using stale data: it is the risk of using
complete garbage if the task_struct page gets reused. The procfs code
does check that tsk->mm is non-zero before following the pointers, but
if there is a non-zero address there then it _will_ be dereferenced

> What we _might_ do in /proc, is to just increment the usage count for the
> (double) page that contains the task structure,

That would certainly take care of it.


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