Re: BUG: Global FPU corruption in 2.2

From: Michal Jaegermann (
Date: Tue Apr 24 2001 - 15:15:25 EST

On Tue, Apr 24, 2001 at 06:56:32PM +0200, Christian Ehrhardt wrote:
> On Tue, Apr 24, 2001 at 09:10:07AM -0700, Linus Torvalds wrote:
> > 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.
> This is only true for requests other than PTRACE_ATTACH and
> PTRACE_ATTACH is exactly what I'm worried about.

May I remind everybody that at the beginning of this thread I posted
another example, from an SMP Alpha, of FPU problems. It certainly
was not exactly like the one under discussion but it looked that
it had a similar "smell" to it.

It looks like that to reproduce this Alpha example one needs processors
with a rather fast clock and this hardware version is not yet very
widely available.

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