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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Mark Brown References: <20260116132053.857887-1-lorenzo.stoakes@oracle.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAa2VybmVsLm9yZz7CwY0EEwEIADcWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCaKYhwAIbAwUJJlgIpAILCQQVCgkIAhYCAh4FAheAAAoJEE3eEPcA/4Naa5EP/3a1 9sgS9m7oiR0uenlj+C6kkIKlpWKRfGH/WvtFaHr/y06TKnWn6cMOZzJQ+8S39GOteyCCGADh 6ceBx1KPf6/AvMktnGETDTqZ0N9roR4/aEPSMt8kHu/GKR3gtPwzfosX2NgqXNmA7ErU4puf zica1DAmTvx44LOYjvBV24JQG99bZ5Bm2gTDjGXV15/X159CpS6Tc2e3KvYfnfRvezD+alhF XIym8OvvGMeo97BCHpX88pHVIfBg2g2JogR6f0PAJtHGYz6M/9YMxyUShJfo0Df1SOMAbU1Q Op0Ij4PlFCC64rovjH38ly0xfRZH37DZs6kP0jOj4QdExdaXcTILKJFIB3wWXWsqLbtJVgjR YhOrPokd6mDA3gAque7481KkpKM4JraOEELg8pF6eRb3KcAwPRekvf/nYVIbOVyT9lXD5mJn IZUY0LwZsFN0YhGhQJ8xronZy0A59faGBMuVnVb3oy2S0fO1y/r53IeUDTF1wCYF+fM5zo14 5L8mE1GsDJ7FNLj5eSDu/qdZIKqzfY0/l0SAUAAt5yYYejKuii4kfTyLDF/j4LyYZD1QzxLC MjQl36IEcmDTMznLf0/JvCHlxTYZsF0OjWWj1ATRMk41/Q+PX07XQlRCRcE13a8neEz3F6we 08oWh2DnC4AXKbP+kuD9ZP6+5+x1H1zEzsFNBFXLn5EBEADn1959INH2cwYJv0tsxf5MUCgh Cj/CA/lc/LMthqQ773gauB9mN+F1rE9cyyXb6jyOGn+GUjMbnq1o121Vm0+neKHUCBtHyseB fDXHA6m4B3mUTWo13nid0e4AM71r0DS8+KYh6zvweLX/LL5kQS9GQeT+QNroXcC1NzWbitts 6TZ+IrPOwT1hfB4WNC+X2n4AzDqp3+ILiVST2DT4VBc11Gz6jijpC/KI5Al8ZDhRwG47LUiu Qmt3yqrmN63V9wzaPhC+xbwIsNZlLUvuRnmBPkTJwwrFRZvwu5GPHNndBjVpAfaSTOfppyKB Tccu2AXJXWAE1Xjh6GOC8mlFjZwLxWFqdPHR1n2aPVgoiTLk34LR/bXO+e0GpzFXT7enwyvF FFyAS0Nk1q/7EChPcbRbhJqEBpRNZemxmg55zC3GLvgLKd5A09MOM2BrMea+l0FUR+PuTenh 2YmnmLRTro6eZ/qYwWkCu8FFIw4pT0OUDMyLgi+GI1aMpVogTZJ70FgV0pUAlpmrzk/bLbRk F3TwgucpyPtcpmQtTkWSgDS50QG9DR/1As3LLLcNkwJBZzBG6PWbvcOyrwMQUF1nl4SSPV0L LH63+BrrHasfJzxKXzqgrW28CTAE2x8qi7e/6M/+XXhrsMYG+uaViM7n2je3qKe7ofum3s4v q7oFCPsOgwARAQABwsF8BBgBCAAmAhsMFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAmic2qsF CSZYCKEACgkQTd4Q9wD/g1oq0xAAsAnw/OmsERdtdwRfAMpC74/++2wh9RvVQ0x8xXvoGJwZ rk0Jmck1ABIM//5sWDo7eDHk1uEcc95pbP9XGU6ZgeiQeh06+0vRYILwDk8Q/y06TrTb1n4n 7FRwyskKU1UWnNW86lvWUJuGPABXjrkfL41RJttSJHF3M1C0u2BnM5VnDuPFQKzhRRktBMK4 GkWBvXlsHFhn8Ev0xvPE/G99RAg9ufNAxyq2lSzbUIwrY918KHlziBKwNyLoPn9kgHD3hRBa Yakz87WKUZd17ZnPMZiXriCWZxwPx7zs6cSAqcfcVucmdPiIlyG1K/HIk2LX63T6oO2Libzz 7/0i4+oIpvpK2X6zZ2cu0k2uNcEYm2xAb+xGmqwnPnHX/ac8lJEyzH3lh+pt2slI4VcPNnz+ vzYeBAS1S+VJc1pcJr3l7PRSQ4bv5sObZvezRdqEFB4tUIfSbDdEBCCvvEMBgoisDB8ceYxO cFAM8nBWrEmNU2vvIGJzjJ/NVYYIY0TgOc5bS9wh6jKHL2+chrfDW5neLJjY2x3snF8q7U9G EIbBfNHDlOV8SyhEjtX0DyKxQKioTYPOHcW9gdV5fhSz5tEv+ipqt4kIgWqBgzK8ePtDTqRM qZq457g1/SXSoSQi4jN+gsneqvlTJdzaEu1bJP0iv6ViVf15+qHuY5iojCz8fa0= In-Reply-To: <20260116132053.857887-1-lorenzo.stoakes@oracle.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 5DC35160009 X-Stat-Signature: cd6zw54o7qniumu466zfkqdpuf6gaudi X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1768819197-738101 X-HE-Meta: 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 AXd4Shxr gA8NBTjtxbnyQP3Q4qGjAsEJL43ZZLoqmr6I2N9abl7A1tBhnKToWW0liMfvd12WgMttRGCYPUuYnuV8rfrdrE9WmCzfQLkwPOLX567g3vWibMeu7u/KFi1c0/uxXnbx3jAXafITW/iqmcgL4+sTUwukRlS0wMYvfV1M9JahpsbsdAWW7SbnqsL7/paObnreZOiCQ7VrDeUwgvKcqS+Ll5tqdEvrRTPv79vHMFh/Gf695FdyZVy9KWill0PUAe04JcyTJUOLaFkyhXCL05XUG0JOmbkLfLkLYPrglAtBy2mHK3AKQ5ynF7IWdBhRj6wOwn1agu+1WcPUkttw= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1/16/26 14:20, Lorenzo Stoakes wrote: > This self test is asserting internal implementation details and is highly > vulnerable to internal kernel changes as a result. > > It is currently failing locally from at least v6.17, and it seems that it > may have been failing for longer in many configurations/hardware as it > skips if e.g. CONFIG_ANON_VMA_NAME is not specified. > > With these skips and the fact that run_vmtests.sh won't run the tests in > certain configurations it is likely we have simply missed this test being > broken in CI for a long while. > > I have tried multiple versions of these tests and am unable to find a > working bisect as previous versions of the test fail also. > > The tests are essentially mmap()'ing a series of mappings with no hint and > asserting what the get_unmapped_area*() functions will come up with, with > seemingly few checks for what other mappings may already be in place. > > It then appears to be mmap()'ing with a hint, and making a series of > similar assertions about the internal implementation details of the hinting > logic. > > Commit 0ef3783d7558 ("selftests/mm: add support to test 4PB VA on PPC64"), > commit 3bd6137220bb ("selftests/mm: virtual_address_range: avoid reading > from VM_IO mappings"), and especially commit a005145b9c96 ("selftests/mm: > virtual_address_range: mmap() without PROT_WRITE") are good examples of the > whack-a-mole nature of maintaining this test. > > The last commit there being particularly pertinent as it was accounting for > an internal implementation detail change that really should have no bearing > on self-tests, that is commit e93d2521b27f ("x86/vdso: Split virtual clock > pages into dedicated mapping"). > > The purpose of the mm self-tests are to assert attributes about the API > exposed to users, and to ensure that expectations are met. > > This test is emphatically not doing this, rather making a series of > assumptions about internal implementation details and asserting them. > > It therefore, sadly, seems that the best course is to remove this test > altogether. > > Signed-off-by: Lorenzo Stoakes On $ uname -r 6.18.4-200.fc43.x86_64 I am getting $ ./va_high_addr_switch mmap(addr_switch_hint - pagesize, pagesize): 0x7fe7de6d7000 - OK mmap(addr_switch_hint - pagesize, (2 * pagesize)): 0x7fe7de6d6000 - OK mmap(addr_switch_hint, pagesize): 0x7fe7de6d7000 - OK mmap(addr_switch_hint, 2 * pagesize, MAP_FIXED): 0xffffffffffffffff - FAILED mmap(NULL): 0x7fe7de6d5000 - OK mmap(low_addr): 0x40000000 - OK mmap(high_addr): 0x7fe7de6d5000 - OK mmap(high_addr) again: 0x7fe7de6d3000 - OK mmap(high_addr, MAP_FIXED): 0xffffffffffffffff - FAILED mmap(-1): 0x7fe7de6d1000 - OK mmap(-1) again: 0x7fe7de6cf000 - OK mmap(addr_switch_hint - pagesize, pagesize): 0x7fe7de6d0000 - OK mmap(addr_switch_hint - pagesize, 2 * pagesize): 0x7fe7de6cf000 - OK mmap(addr_switch_hint - pagesize/2 , 2 * pagesize): 0x7fe7de6cd000 - OK mmap(addr_switch_hint, pagesize): 0x7fe7de6cc000 - OK mmap(addr_switch_hint, 2 * pagesize, MAP_FIXED): 0xffffffffffffffff - FAILED Are these the same issues you see? -- Cheers David