Re: BUG: Global FPU corruption in 2.2

[Linus Torvalds]

In article <[EMAIL PROTECTED]>,
Christian Ehrhardt <[EMAIL PROTECTED]> wrote:
>
>1.) If I'm not mistaken switch_to changes current->flags without
>atomic operations and without any locks and sys_ptrace changes
>child->flags only protected by the big kernel lock.

ptrace only operates on processes that are stopped. So there are no
locking issues - we've synchronized on a much higher level than a
spinlock or semaphore.

That said, it does look like 2.2.x has a real bug, and maybe the ptrace
task stopping sycnhronization is broken..

                Linus
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