From mboxrd@z Thu Jan 1 00:00:00 1970 From: achandran@mvista.com (Arun Chandran) Date: Tue, 23 Jun 2015 21:08:31 +0530 Subject: BUG: Bad page state in process swapper pfn:XXXXX In-Reply-To: <20150622151647.GW7557@n2100.arm.linux.org.uk> References: <20150622151647.GW7557@n2100.arm.linux.org.uk> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Jun 22, 2015 at 8:46 PM, Russell King - ARM Linux wrote: > On Mon, Jun 22, 2015 at 08:04:17PM +0530, Arun Chandran wrote: >> Hi, >> >> I am booting the latest linus tree on altera cyclone5 soc development kit. >> (https://www.altera.com/products/boards_and_kits/dev-kits/altera/kit-cyclone-v-soc.html) >> With the dtb file arch/arm/boot/dts/socfpga_cyclone5_socdk.dtb. >> >> I get these BUGS (page dumped because: non-NULL mapping) randomly; occurs >> around 1 in 5 times during cold boots. > > When did the problem start? Are older kernel versions stable? > It took sometime for me; as the issue is random. I did bisect with the conditions a) All the good commit was tested for more than 25 cold boots b) Testing of a bad commit stopped as soon as I met with "BUG: Bad page state in process swapper pfn:XXXXX" I found that problem is between v3.13(good) and v3.14(bad) and the problem commit is "84f452b1e8fc73ac0e31254c66e3e2260ce5263d ARM: mm: Remove bootmem code and switch to NO_BOOTMEM" If I boot v3.14 with the above commit reverted, the problem is not seen. I don't know whether my board lacks any platform code to support the above commit. --Arun