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Mon, 7 Dec 2020 09:38:37 +0000 (UTC) Received: from [10.36.114.33] (ovpn-114-33.ams2.redhat.com [10.36.114.33]) by smtp.corp.redhat.com (Postfix) with ESMTP id E6DAB614FD; Mon, 7 Dec 2020 09:38:36 +0000 (UTC) Subject: Re: 5.10 RC 7: grub2 out of memory To: Elias Carter , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <56e933e4-a495-1497-eb48-b9b8f0da46d3@redhat.com> Date: Mon, 7 Dec 2020 10:38:36 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 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: On 07.12.20 10:16, Elias Carter wrote: > I just compiled and installed 5.10 RC 7 and got a message from grub2: > "out of memory, press any key to continue" shortly followed by a > kernel panic (see attached screenshot). > > The 5.4.0-56-generic kernel from Ubuntu works on my machine fine. > > Things I have tried so far: > - setting grub video mode to "console" > - setting grub video resolution to 800x600 > - regenerating the initramfs for 5.10 RC 7 > - verifying that /boot has free space > - changing boot mode from UEFI to legacy BIOS > > I have attached the following: > 1.) dmesg ran from using the 5.4 kernel (since I cant boot into 5.10 RC 7) > 2.) my 5.10 RC 7 kernel .config > 3.) screenshot of kernel panic after "out of memory" grub2 message > 4.) my /etc/default/grub > > Please let me know if you would like any more information or testing of patches. The kernel crashes because it's unable to mount root - I suspect the initrd is not loaded, because I would have expected systemd messages before trying to mount root (after loading additional drivers from the initrd). I assume grub2 fails to load the (now too big?) initrd - you could try compiling out debug symbols and give it a try. What's the size difference between old vs. new kernel and old vs. new initrd? Similar report for aarch64 was at https://bugzilla.redhat.com/show_bug.cgi?id=1615969 which turned out to be a grub2 issue. Which distro/grub2 version etc are you running? -- Thanks, David / dhildenb