* [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> On Fri, 11 Jan 2008 13:31:47 PST, Roland McGrath said:
> > > thanks, applied. Does this explain the crash/hang problems with 32-bit
> > > apps on 64-bit kernels? What was the exact failure mode?
> >
> > It does. Any 32-bit process trying to run a signal handler when it had
> > used the FPU, would clobber "current" with FP bits. The observed failure
> > mode was shortly after this in the signal handler setup code, when it
> > crashed due to current->mm being zero (current->pid also being zero, and
> > the whole first 512 bytes of the task_struct being garbage).
>
> For what it's worth, this patch fixes a problem I had in 24-rc6-mm1
> with kernel panics when certain X programs exited (Eterm being the
> biggest cause), that I had bisected to "somewhere in
> git-x86.patch"....
ok, good. Yesterday's x86.git update has this fix included so the next
-mm iteration should have the fix as well.
Ingo
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