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a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=GoEa3M9JfhUA:10 a=4HQWuOB28sff7wrsyJwA:9 a=QEXdDO2ut3YA:10 cc=ntf awl=host:12061 X-Proofpoint-GUID: NHql7Ft_SWHEg-rl9NneR1uQoecNLY9p X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzE2MDE1MSBTYWx0ZWRfX4+PCr5waE0MT vGWcVRx9SPKcGaFcS9ki8/Rc7bzPJqU3fycexoI6qA/D3RfgDMvin3GZcyanJeliPJfwJopMJCN P7a0zQazyTtgiqjivQVpyVWsdO60FSUnCSGB63KqKYimNaKQn1deC8dG3fpEMyUx4WvIZfdgDBt 6oJf6ZxE0kSkFg5jGbPBY6+xZJH1ba30/46FOjrAV/HwuzQLgN6vxHEMyx1i0LPcCi6fLRWxCqt uWqems0v5rfrNkf8uLRzEC1RBrw4Q7sopPlL4cq+Gz/xuE1CW85cY/bczGbRtd/QFVgDi+hYD7R xnwsPVK9X+eU9yBSBwxpGaW9sB7hSQ98T5n+Rey2d1MvaF9aVhA6O3z/7VTaJJX6Ir9MG/42r4R Dn+o1bYE/RUnp0i0xbwE7ND+Rn1fPirm6hjYq/AjFnnC3N8fwwuSIwLPAItrgJo9ebz8VgU+ On 7/16/25 1:41 AM, John Paul Adrian Glaubitz wrote: > Hi Anthony, > > On Wed, 2025-07-16 at 08:18 +0200, John Paul Adrian Glaubitz wrote: >> On Tue, 2025-07-15 at 18:24 -0700, Anthony Yznaga wrote: >>> An attempt to exercise sparc hugetlb code in a sun4u-based guest >>> running under qemu results in the guest hanging due to being stuck >>> in a trap loop. This is due to invalid hugetlb TTEs being installed >>> that do not have the expected _PAGE_PMD_HUGE and page size bits set. >>> Although the breakage has gone apparently unnoticed for several years, >>> fix it now so there is the option to exercise sparc hugetlb code under >>> qemu. This can be useful because sun4v support in qemu does not support >>> linux guests currently and sun4v-based hardware resources may not be >>> readily available. >> >> It has actually been observed for a long time that newer kernels are >> unstable on sun4u while there are no stability issues on sun4v. > > Just as a heads-up: I'm currently building a Debian kernel with this patch > and see if this fixes the stability issues we're seeing on UltraSPARC machines. If it's the use of hugetlb that is causing problems then this patch should help. > >> I'm not sure though whether the Debian kernel enables hugetlb by default. > > We do. > > I'll report back. > > Adrian >