From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754055AbcFPJXw (ORCPT ); Thu, 16 Jun 2016 05:23:52 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:35254 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752605AbcFPJXq (ORCPT ); Thu, 16 Jun 2016 05:23:46 -0400 Date: Thu, 16 Jun 2016 18:23:45 +0900 From: Sergey Senozhatsky To: Michal Hocko Cc: Sergey Senozhatsky , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka , Minchan Kim , Stephen Rothwell , Sergey Senozhatsky Subject: Re: [next-20160615] kernel BUG at mm/rmap.c:1251! Message-ID: <20160616092345.GC432@swordfish> References: <20160616084656.GB432@swordfish> <20160616085836.GC6836@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160616085836.GC6836@dhcp22.suse.cz> User-Agent: Mutt/1.6.1 (2016-04-27) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (06/16/16 10:58), Michal Hocko wrote: > > [..] > > [ 272.687656] vma ffff8800b855a5a0 start 00007f3576d58000 end 00007f3576f66000 > > next ffff8800b977d2c0 prev ffff8800bdfb1860 mm ffff8801315ff200 > > prot 8000000000000025 anon_vma ffff8800b7e583b0 vm_ops (null) > > pgoff 7f3576d58 file (null) private_data (null) > > flags: 0x100073(read|write|mayread|maywrite|mayexec|account) > > [ 272.691793] ------------[ cut here ]------------ > > [ 272.692820] kernel BUG at mm/rmap.c:1251! > > Is this? > page_add_new_anon_rmap: > VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma) > [...] I think it is 1248 void page_add_new_anon_rmap(struct page *page, 1249 struct vm_area_struct *vma, unsigned long address, bool compound) 1250 { 1251 int nr = compound ? hpage_nr_pages(page) : 1; 1252 1253 VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); 1254 __SetPageSwapBacked(page); > > [ 272.727842] BUG: sleeping function called from invalid context at include/linux/sched.h:2960 > > If yes then I am not sure we can do much about the this part. BUG_ON in > an atomic context is unfortunate but the BUG_ON points out a real bug so > we shouldn't drop it because of the potential atomic context. The above > VM_BUG_ON should definitely be addressed. I thought that Vlastimil has > pointed out some issues with the khugepaged lock inconsistencies which > might lead to issues like this. collapse_huge_page() ->mmap_sem fixup patch (http://marc.info/?l=linux-mm&m=146495692807404&w=2) is in next-20160615. or do you mean some other patch? -ss