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RE: [Xen-devel] Re: Floating Point Exception when compiling w/ gcc

On Sat, 5 Mar 2005, Ian Pratt wrote:
I just tried xen-unstable from 20050302 (I was waiting for it to be
packaged in the fedora development repo), and it's much
better - thanks!

Please could you try out 2.0-testing.bk and report back. If it works for
you, I'll declare it 2.0.5.

Yes, it works for me!

However, there is still a less frequent problem with ptrace
(which also
occurred even when I'd applied my workaround patch). When running
firefox under gdb only, display corruption and odd crashes in
floating-point code are seen - which are the same symptoms as
I had before.

So I assume that something is still wrong with the floating-point
save/restore in the case where a process is being ptraced.

Hmmm. Please can you try producing a simple set of instructions that
exhibits the bug reliably.

I couldn't find a reliable test case, but I think I've fixed this, too.
It appears to have been a typo in this patch:


which has not yet been applied to xen-unstable, because it's a patch for linux 2.6.11.

In the last change of the patch,
 if (tsk_used_math(tsk))
should read
 if (!tsk_used_math(tsk))

The fix is already checked in to fedora CVS.

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