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[80.187.83.110]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4255d8f4ab0sm19684661f8f.52.2025.10.06.01.16.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Oct 2025 01:16:29 -0700 (PDT) Message-ID: <26ae6b04-3beb-47e9-9639-b081003dc9bb@redhat.com> Date: Mon, 6 Oct 2025 10:16:26 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 0/5] kdump: crashkernel reservation from CMA To: Breno Leitao , Jiri Bohac Cc: riel@surriel.com, vbabka@suse.cz, nphamcs@gmail.com, Baoquan He , Vivek Goyal , Dave Young , kexec@lists.infradead.org, akpm@linux-foundation.org, Philipp Rudo , Donald Dutile , Pingfan Liu , Tao Liu , linux-kernel@vger.kernel.org, Michal Hocko References: From: David Hildenbrand Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 03.10.25 17:51, Breno Leitao wrote: > Hello Jiri, > > On Thu, Jun 12, 2025 at 12:11:19PM +0200, Jiri Bohac wrote: > >> Currently this is only the case for memory ballooning and zswap. Such movable >> memory will be missing from the vmcore. User data is typically not dumped by >> makedumpfile. > > For zswap and zsmalloc pages, I'm wondering whether these pages will be missing > from the vmcore, or if there's a possibility they might be present but > corrupted—especially since they could reside in the CMA region, which may be > overwritten by the kdump environment. That's not different to ordinary user pages residing on these areas, right? -- Cheers David / dhildenb