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[2003:cb:c740:4b00:7ba7:a109:29b8:e459]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37189849697sm11454529f8f.37.2024.08.19.14.57.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Aug 2024 14:57:30 -0700 (PDT) Message-ID: <6814fdf6-cf32-43e9-ba20-705ec5238abe@redhat.com> Date: Mon, 19 Aug 2024 23:57:29 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/4] mm: BUG_ON to avoid NULL deference while __GFP_NOFAIL fails To: Linus Torvalds Cc: Michal Hocko , Barry Song <21cnbao@gmail.com>, akpm@linux-foundation.org, linux-mm@kvack.org, 42.hyeyoo@gmail.com, cl@linux.com, hailong.liu@oppo.com, hch@infradead.org, iamjoonsoo.kim@lge.com, penberg@kernel.org, rientjes@google.com, roman.gushchin@linux.dev, urezki@gmail.com, v-songbaohua@oppo.com, vbabka@suse.cz, virtualization@lists.linux.dev, Christoph Hellwig , Lorenzo Stoakes , Kees Cook , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Jason Wang , Maxime Coquelin , "Michael S. Tsirkin" , Xuan Zhuo References: <20240817062449.21164-1-21cnbao@gmail.com> <20240817062449.21164-4-21cnbao@gmail.com> <5654b71c-1d9d-4c48-b28b-664662da8897@redhat.com> <416ac265-ced2-4f90-a347-0a256edf7fdf@redhat.com> <54a4619d-e826-465e-9a0f-0a8f37798e15@redhat.com> <5424dfa3-03db-4a82-a08e-fb31285774b3@redhat.com> 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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: D1FFF40010 X-Stat-Signature: p1sbqagt4dw8bk3m74kwrixphwisx8xm X-HE-Tag: 1724104654-715769 X-HE-Meta: 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 FDDard2b 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 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 19.08.24 22:35, Linus Torvalds wrote: > On Mon, 19 Aug 2024 at 13:24, David Hildenbrand wrote: >> >> Right, "warn + loop forever" is one alternative where you could at least >> keep the system alive to some degree. > > Maybe. Or it might just lock up the machine. Yes, regarding the security concerns it might be a bit better that way. (no security expert, so I cannot judge ...) So, instead of saying "No, you can't have a pony, stupid", you would say "well, let me talk to your mother about that (WARN)" ... and just never reply to the real question ... :) -- Cheers, David / dhildenb