From mboxrd@z Thu Jan 1 00:00:00 1970 From: balbi@ti.com (Felipe Balbi) Date: Thu, 31 Jul 2014 08:43:44 -0500 Subject: Bad Page dump (help) In-Reply-To: <53D9E10F.6040408@xenomai.org> References: <20140729190700.GN17808@saruman.home> <53D9E10F.6040408@xenomai.org> Message-ID: <20140731134344.GA19512@saruman.home> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, On Thu, Jul 31, 2014 at 08:24:15AM +0200, Gilles Chanteperdrix wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 07/29/2014 09:07 PM, Felipe Balbi wrote: > > Hi Russell, > > > > I'm bringing up a new board on today's linux-next but I'm having a bunch > > of bad_page() calls due to _mapcount not being zero (full logs > > attached). What could cause that ? Any hints on how to debug ? It's as > > if page_mapcount_reset() wasn't called for the pages which are causing > > issues. > > FWIW, the same issue appeared on a Cogent CSB637 board (the last board > I use not using DT) in between 3.13 and 3.14. I ran a bisect and found > that reverting the following commit: > > commit 84f452b1e8fc73ac0e31254c66e3e2260ce5263d > Author: Santosh Shilimkar > Date: Sun Jun 30 00:28:46 2013 -0400 > > ARM: mm: Remove bootmem code and switch to NO_BOOTMEM > > Now with dma_mask series merged and max*pfn has consistent meaning on ARM > as rest of the arch's thanks to RMK's mega series, lets switch ARM code > to NO_BOOTMEM. With NO_BOOTMEM change, now we use memblock allocator to > reserve space for crash kernel to have one less dependency with nobootmem > allocator wrapper. > > Tested with both flat memory and sparse (faked) memory models with highmem > enabled. Thanks I'll give this a shot. > Seemed to make the issue disappear. I later found out that changing the > kernel options also made the issue disappear. which kernel options did you change ? -- balbi -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: