Re: BUG: Global FPU corruption in 2.2

From: Linus Torvalds (
Date: Tue Apr 24 2001 - 11:10:07 EST

In article <>,
Christian Ehrhardt <> 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..

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This archive was generated by hypermail 2b29 : Mon Apr 30 2001 - 21:00:12 EST