[LLVMdev] buildbot failure in LLVM on clang-x86_64-debian-fnt

Chandler Carruth chandlerc at google.com
Tue Feb 21 04:01:11 PST 2012

On Tue, Feb 21, 2012 at 3:51 AM, Jay Foad <jay.foad at gmail.com> wrote:

> On 21 February 2012 11:45, Chandler Carruth <chandlerc at google.com> wrote:
> > Either way, I would try speculatively reverting to ensure it is this
> patch.
> > If so, we can keep experimenting with the patch, but it's important to
> get
> > the builders back. There are several others seeing the failure as well.
> OK, I've reverted it. Duncan is letting me play on the build slave
> machine, where I'm having more luck reproducing it. I think the
> failures might depend on which version of GCC you use to compile LLVM.
> Or something.

There is definitely undefined behavior in the current implementation of the
hashing logic that might be differently exploited by different optimizers.
You brought up some of it in code review already.
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