Comment 7 for bug 1794033

The Broadwell failure is interesting as it's clearly a memory corruption issue.
Running the dEQP-GLES31.functional.debug.* tests under valgrind, I can see a few errors from the CTS suite :

Test case 'dEQP-GLES31.functional.debug.negative_coverage.callbacks.state.get_nuniformfv'..

==12081== Use of uninitialised value of size 8
==12081== at 0x59B505E: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25)
==12081== by 0x59B55A8: std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_int<long>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25)
==12081== by 0x59C1178: std::ostream& std::ostream::_M_insert<long>(long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25)
==12081== by 0x71CAF1: std::ostream& tcu::Format::operator<< <int const*>(std::ostream&, tcu::Format::Array<int const*> const&) (in /home/djdeath/src/mesa-src/VK-GL-CTS/build-es31/modules/gles31/deqp-gles31)
==12081== by 0xD9F922: std::ostream& tcu::Format::operator<< <int>(std::ostream&, tcu::Format::ArrayPointer<int> const&) (in /home/djdeath/src/mesa-src/VK-GL-CTS/build-es31/modules/gles31/deqp-gles31)
==12081== by 0xEE0160: tcu::MessageBuilder& tcu::MessageBuilder::operator<< <tcu::Format::ArrayPointer<int> >(tcu::Format::ArrayPointer<int> const&) (in /home/djdeath/src/mesa-src/VK-GL-CTS/build-es31/modules/gles31/deqp-gles31)
==12081== by 0xE9E45F: glu::CallLogWrapper::glGetIntegerv(unsigned int, int*) (in /home/djdeath/src/mesa-src/VK-GL-CTS/build-es31/modules/gles31/deqp-gles31)
==12081== by 0xA611D2: deqp::gles31::Functional::NegativeTestShared::get_nuniformfv(deqp::gles31::Functional::NegativeTestShared::NegativeTestContext&) (in /home/djdeath/src/mesa-src/VK-GL-CTS/build-es31/modules/gles31/deqp-gles31)
==12081== by 0x7230DF: deqp::gles31::Functional::(anonymous namespace)::TestFunctionWrapper::call(deqp::gles31::Functional::(anonymous namespace)::DebugMessageTestContext&) const (in /home/djdeath/src/mesa-src/VK-GL-CTS/build-es31/modules/gles31/deqp-gles31)
==12081== by 0x725DA1: deqp::gles31::Functional::(anonymous namespace)::CallbackErrorCase::iterate() (in /home/djdeath/src/mesa-src/VK-GL-CTS/build-es31/modules/gles31/deqp-gles31)
==12081== by 0x6DCAD3: deqp::gles31::TestCaseWrapper::iterate(tcu::TestCase*) (in /home/djdeath/src/mesa-src/VK-GL-CTS/build-es31/modules/gles31/deqp-gles31)
==12081== by 0xF9E157: tcu::TestSessionExecutor::iterateTestCase(tcu::TestCase*) (in /home/djdeath/src/mesa-src/VK-GL-CTS/build-es31/modules/gles31/deqp-gles31)

I'm not sure whether that's related, might be worth fixing though (trying to write some patches).