[Bug 220272] Latent race condition in USB code unveiled with optimized memset_64.S

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220272

Oliver Neukum (oliver@neukum.org) changed:

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--- Comment #26 from Oliver Neukum (oliver@neukum.org) ---
(In reply to Alan Stern from comment #23)

> 
> There's nothing to indicate why the mouse is misbehaving in this way.  Maybe
> it just needs to be initialized twice before it will work right.  Whatever
> the reason is, it certainly looks like the fault is in the mouse, not in the
> computer's software.

This is exactly what you'd expect to see if the CPU were operating on stale
buffers. They are memset to zero before being used for IO. That is the whole
point of the code which triggers this bug, isn't it?

This really looks like we are not invalidating a cache line we should
invalidate.

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