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[2003:d8:2f20:da00:b70a:d502:3b51:1f2d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3e7607870cfsm6004344f8f.19.2025.09.12.02.28.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 12 Sep 2025 02:28:26 -0700 (PDT) Message-ID: Date: Fri, 12 Sep 2025 11:28:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: transhuge-stress: fix potential memory leak on realloc failure To: Haofeng Li <920484857@qq.com>, Andrew Morton Cc: Lorenzo Stoakes , Zi Yan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, Haofeng Li <13266079573@163.com>, Haofeng Li References: From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: JA64cgGiS3u5dNwS4OV3VWJu7Vvus9PeETrtO10aRP4_1757669307 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: A57021C0013 X-Stat-Signature: 4nh3nfdj1xjo7fym7zkh5h74rb1etckk X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1757669310-561926 X-HE-Meta: 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 MuEGDMtz FNIjBRZDvs81xQkkq/GJS8uUo20/zVoyK4uBXR8p6r9k2mcykMbr9zUl2ng1n//y7LEoEhkUV2jEfv2+uMC7HB+mnLil+v2FSUmZTNCcbbHbTlY4ch8e/FSf7wiSM5yvJymxgVF5+uXQvBX91MbnsAwcnTXgjRlTVRDPLkad5gsW0gzyJHwt3PhbedbuvM45TF/vpeso3edF8AH53a7JznifWHqhSDrPz7QvooEUVGpdK6GKN2qtlUZ5xGu93G4VOKzGufTV2uIpI4pag2Wp+8AFf3vYKf7l6QbxWVDqH6tiQp9K7LxTDlHyPcyZ7UFg67gAK1RWZiQ8bhIqpzJwO6jsOu+rFmBQoax5RKC0ojE1neDZ4BQGV0kKajpKIu7T7fvmT2sYlid7fYR13EccQ4mg86wjW1s9uA1m399CTxyBazu4= 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 12.09.25 10:20, Haofeng Li wrote: > From: Haofeng Li > > When realloc() fails in transhuge-stress test, the original code > exits immediately without freeing the previously allocated memory, > causing a memory leak. What do you think happens when a process exits? :) Correct! All memory ever allocated to that process gets freed, avoiding any memory leaks. -- Cheers David / dhildenb