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[2003:cb:c72f:6100:aae:4b84:887c:15bb]) by smtp.gmail.com with ESMTPSA id s12-20020a5d424c000000b0033e48db23bdsm5940953wrr.100.2024.03.11.02.31.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Mar 2024 02:31:42 -0700 (PDT) Message-ID: <4a5c8d28-7f73-4c15-b288-641f0ccc91c2@redhat.com> Date: Mon, 11 Mar 2024 10:31:41 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: BUG selftests/mm] To: Mirsad Todorovac , linux-mm@kvack.org Cc: Peter Xu , Andrew Morton , Shuah Khan , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Axel Rasmussen References: From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK 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en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 92A1940005 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: t898mmmei69e8zxt6ywz9e4fw95csbh1 X-HE-Tag: 1710149509-964128 X-HE-Meta: U2FsdGVkX195OKhAZujTVFr7X3+z8VIPXbMyjcJNw8FTeqKn9XimI/b9baXV6MYXPDqKjEY3/j4yjeEIg5SvDPlq4ki05gb46LtFJ09BfGZ1ArqCOsdspWValjzK3i7rc9GmxdUPjV0NB+Q+ZlS1HLUPbheuM193k0PFTYrK2QNYW05ts1gVgidb+1JX/JOkze5Hrildvw+4A7C4YHx2TYgh7fAui1Mytr9QTceH9azr38HAYs3qagCUDZ/xawanxDH3xBzDhDuKxhWBbsi7z2sFStBxuX+niDnvhS1Cq9QWqaHfrF1z/NugNEJ+CB22j275VwrS0HW0Cay3FKYHAkFwrTDChZ1FUU80LBD/upZbSJltxJ5EC8ys/ykfnXMlm2NLfFXis/TRA2Y7ltpKU6s3+9ID2SuNnx97D5LIP4JIn/ajqgcBez0BklJ+pkInn+OHfj5J0DyZaSWstoo+8sL03YjWe6FBtPp+2lx0dZgGIlIsBi+wOmx3DvQK3SYAAM8dVn0YFMx0Oy+eHIMXraAJ1o1Y3q3jNmmGjBMfP1lIg32qXI2hAscSs23fAIAMVnafXXrBEcs370dICD9VLFizjkhYC2TG/0eveNxpKlbQ9l0wPkgfctGHKraM6defCZq+EUTVSc1DN/sAXcOKvKsGl3zPy1aLh6t5kwWyc1Wk3MEavBpGC3XM+ZN8lqC6RrIpRWKBKkjlGY3EEFNN0vcorUUdQN6GyS50U+95xCArVVrPNnZD4Su0yPjHzCJ076AgulGbQjjucnaZ9kWVAhYWUr9A1m3Hs7D7CPv68VuAHNFDNwaDOnNyL7H2sGPEWt5VWDT51vpx5VQ4CslZKHHxNiw4br5qMum31C09jagI1ojpa6N0p+EW+hD3FBxpiwa6mW8iQErTg81rZNYAH7lajBACbun/7muOyDJqbWObsrnjIN0Fv4OUlXFEVxriEUx5XlVEBobNFQ+eEhg Cro9Te1E WcEA7OlKXnORdRgH3VdEg+FdtifZAS5II8f4T5YNy0QsPYb7H0By4KYLnBjA9EEpgNogt2IbLg/J/9eQL41p89uxNk3/fgvNh/PXCkA8lKZYY2LdPwuT3dwUq7m+ZbC6DL6R+gms5UL2w9JoczGfkAt66EbO9nmuwyUev 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 09.03.24 20:12, Mirsad Todorovac wrote: > Hi, > > Routine run of the test in net-next gave also this mm unit error. > > root@defiant:tools/testing/selftests/mm# ./uffd-unit-tests > Testing UFFDIO_API (with syscall)... done > Testing UFFDIO_API (with /dev/userfaultfd)... done > Testing register-ioctls on anon... done > Testing register-ioctls on shmem... done > Testing register-ioctls on shmem-private... done > Testing register-ioctls on hugetlb... skipped [reason: memory allocation failed] > Testing register-ioctls on hugetlb-private... skipped [reason: memory allocation failed] > Testing zeropage on anon... done > Testing zeropage on shmem... done > Testing zeropage on shmem-private... done > Testing zeropage on hugetlb... skipped [reason: memory allocation failed] > Testing zeropage on hugetlb-private... skipped [reason: memory allocation failed] > Testing move on anon... done > Testing move-pmd on anon... done > Testing move-pmd-split on anon... done > Testing wp-fork on anon... done > Testing wp-fork on shmem... done > Testing wp-fork on shmem-private... done > Testing wp-fork on hugetlb... skipped [reason: memory allocation failed] > Testing wp-fork on hugetlb-private... skipped [reason: memory allocation failed] > Testing wp-fork-with-event on anon... done > Testing wp-fork-with-event on shmem... done > Testing wp-fork-with-event on shmem-private... done > Testing wp-fork-with-event on hugetlb... skipped [reason: memory allocation failed] > Testing wp-fork-with-event on hugetlb-private... skipped [reason: memory allocation failed] > Testing wp-fork-pin on anon... done > Testing wp-fork-pin on shmem... done > Testing wp-fork-pin on shmem-private... done > Testing wp-fork-pin on hugetlb... skipped [reason: memory allocation failed] > Testing wp-fork-pin on hugetlb-private... skipped [reason: memory allocation failed] > Testing wp-fork-pin-with-event on anon... done > Testing wp-fork-pin-with-event on shmem... done > Testing wp-fork-pin-with-event on shmem-private... done > Testing wp-fork-pin-with-event on hugetlb... skipped [reason: memory allocation failed] > Testing wp-fork-pin-with-event on hugetlb-private... skipped [reason: memory allocation failed] > Testing wp-unpopulated on anon... done > Testing minor on shmem... done > Testing minor on hugetlb... skipped [reason: memory allocation failed] > Testing minor-wp on shmem... done > Testing minor-wp on hugetlb... skipped [reason: memory allocation failed] > Testing minor-collapse on shmem... done > Testing sigbus on anon... done > Testing sigbus on shmem... done > Testing sigbus on shmem-private... done > Testing sigbus on hugetlb... skipped [reason: memory allocation failed] > Testing sigbus on hugetlb-private... skipped [reason: memory allocation failed] > Testing sigbus-wp on anon... done > Testing sigbus-wp on shmem... done > Testing sigbus-wp on shmem-private... done > Testing sigbus-wp on hugetlb... skipped [reason: memory allocation failed] > Testing sigbus-wp on hugetlb-private... skipped [reason: memory allocation failed] > Testing events on anon... done > Testing events on shmem... done > Testing events on shmem-private... done > Testing events on hugetlb... skipped [reason: memory allocation failed] > Testing events on hugetlb-private... skipped [reason: memory allocation failed] > Testing events-wp on anon... done > Testing events-wp on shmem... done > Testing events-wp on shmem-private... done > Testing events-wp on hugetlb... skipped [reason: memory allocation failed] > Testing events-wp on hugetlb-private... skipped [reason: memory allocation failed] > Testing poison on anon... done > Testing poison on shmem... done > Testing poison on shmem-private... done > Testing poison on hugetlb... skipped [reason: memory allocation failed] > Testing poison on hugetlb-private... skipped [reason: memory allocation failed] > Userfaults unit tests: pass=42, skip=24, fail=0 (total=66) > root@defiant:tools/testing/selftests/mm# grep -i huge /proc/meminfo > > It resulted in alarming errors in the syslog: > > Mar 9 19:48:24 defiant kernel: [77187.055103] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 4631e000 > Mar 9 19:48:24 defiant kernel: [77187.055132] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46320000 > Mar 9 19:48:24 defiant kernel: [77187.055160] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46322000 > Mar 9 19:48:24 defiant kernel: [77187.055189] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46324000 > Mar 9 19:48:24 defiant kernel: [77187.055218] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46326000 > Mar 9 19:48:24 defiant kernel: [77187.055250] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46328000 > Mar 9 19:48:24 defiant kernel: [77187.055278] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 4632a000 > Mar 9 19:48:24 defiant kernel: [77187.055307] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 4632c000 > Mar 9 19:48:24 defiant kernel: [77187.055336] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 4632e000 > Mar 9 19:48:24 defiant kernel: [77187.055366] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46330000 > Mar 9 19:48:24 defiant kernel: [77187.055395] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46332000 > Mar 9 19:48:24 defiant kernel: [77187.055423] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46334000 > Mar 9 19:48:24 defiant kernel: [77187.055452] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46336000 > Mar 9 19:48:24 defiant kernel: [77187.055480] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46338000 > Mar 9 19:48:24 defiant kernel: [77187.055509] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 4633a000 > Mar 9 19:48:24 defiant kernel: [77187.055538] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 4633c000 > Mar 9 19:48:24 defiant kernel: [77187.055567] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 4633e000 > Mar 9 19:48:24 defiant kernel: [77187.055597] MCE: Killing uffd-unit-tests:1321817 due to hardware memory corruption fault at 46340000 > > At this point, it can be problem with my box's memory chips, or something with HUGETLB. > > However, since the "classic" allocations were successful, the problem might be in huge pages, or > if I understood well, in deliberate poisoning of pages? > Isn't that just the (expected) side effect of UFFDIO_POISON tests? IOW, there is no problem here. We are poisoning virtual memory locations (not actual memory) and expect a SIGBUS on next access. While testing that, we receive these messages. The "ugly" thing here seems to be that we can trigger repeated pr_err() from user space. There is no rate-limiting in place. Maybe UFFDIO_POISON requires root permissions so this cannot be exploited by unprivileged user space to flood the system log? CCing Axel -- Cheers, David / dhildenb