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[193.40.6.72]) by mx.google.com with ESMTPS id u10si4075564lfe.30.2019.03.21.13.22.45 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 21 Mar 2019 13:22:45 -0700 (PDT) Received-SPF: neutral (google.com: 193.40.6.72 is neither permitted nor denied by best guess record for domain of mroos@linux.ee) client-ip=193.40.6.72; Authentication-Results: mx.google.com; spf=neutral (google.com: 193.40.6.72 is neither permitted nor denied by best guess record for domain of mroos@linux.ee) smtp.mailfrom=mroos@linux.ee To: LKML , linux-mm@kvack.org From: Meelis Roos Subject: CONFIG_DEBUG_VIRTUAL breaks boot on x86-32 Message-ID: <4d5ee3b0-6d47-a8df-a6b3-54b0fba66ed7@linux.ee> Date: Thu, 21 Mar 2019 22:22:43 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: et-EE Content-Transfer-Encoding: 7bit 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: I tried to debug another problem and turned on most debug options for memory. The resulting kernel failed to boot. Bisecting the configurations led to CONFIG_DEBUG_VIRTUAL - if I turned it on in addition to some other debug options, the machine crashed with kernel BUG at arch/x86/mm/physaddr.c:79! Screenshot at http://kodu.ut.ee/~mroos/debug_virtual-boot-hang-1.jpg The machine was Athlon XP with VIA KT600 chipset and 2G RAM. -- Meelis Roos