From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 3CFFC6B0005 for ; Thu, 16 Jun 2016 05:54:59 -0400 (EDT) Received: by mail-pf0-f198.google.com with SMTP id a69so94856859pfa.1 for ; Thu, 16 Jun 2016 02:54:59 -0700 (PDT) Received: from mail-pf0-x244.google.com (mail-pf0-x244.google.com. [2607:f8b0:400e:c00::244]) by mx.google.com with ESMTPS id k9si5234829pfj.91.2016.06.16.02.54.58 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 16 Jun 2016 02:54:58 -0700 (PDT) Received: by mail-pf0-x244.google.com with SMTP id c74so3751900pfb.0 for ; Thu, 16 Jun 2016 02:54:58 -0700 (PDT) Date: Thu, 16 Jun 2016 18:54:57 +0900 From: Sergey Senozhatsky Subject: Re: [next-20160615] kernel BUG at mm/rmap.c:1251! Message-ID: <20160616095457.GD432@swordfish> References: <20160616084656.GB432@swordfish> <20160616085836.GC6836@dhcp22.suse.cz> <20160616092345.GC432@swordfish> <20160616094139.GE6836@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160616094139.GE6836@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: 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 On (06/16/16 11:41), Michal Hocko wrote: > On Thu 16-06-16 18:23:45, Sergey Senozhatsky wrote: > > 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? > > Yes that's what I meant, but I haven't reviewed the patch to see whether > it is correct/complete. It would be good to see whether the issue is > related to those changes. I'll copy-paste one more backtrace I swa today [originally was posted to another mail thread]. kernel: BUG: Bad page state in process khugepaged pfn:101db8 kernel: page:ffffea0004076e00 count:0 mapcount:-127 mapping: (null) index:0x1 kernel: flags: 0x8000000000000000() kernel: page dumped because: nonzero mapcount kernel: Modules linked in: lzo zram zsmalloc mousedev coretemp hwmon crc32c_intel snd_hda_codec_realtek i2c_i801 snd_hda_codec_generic r8169 mii snd_hda_intel snd_hda_codec snd_hda_core acpi_cpufreq snd_pcm snd_timer snd soundcore lpc_ich +processor mfd_core sch_fq_codel sd_mod hid_generic usb kernel: CPU: 3 PID: 38 Comm: khugepaged Not tainted 4.7.0-rc3-next-20160615-dbg-00005-gfd11984-dirty #491 kernel: 0000000000000000 ffff8801124c73f8 ffffffff814d69b0 ffffea0004076e00 kernel: ffffffff81e658a0 ffff8801124c7420 ffffffff811e9b63 0000000000000000 kernel: ffffea0004076e00 ffffffff81e658a0 ffff8801124c7440 ffffffff811e9ca9 kernel: Call Trace: kernel: [] dump_stack+0x68/0x92 kernel: [] bad_page+0x158/0x1a2 kernel: [] free_pages_check_bad+0xfc/0x101 kernel: [] free_hot_cold_page+0x135/0x5de kernel: [] __free_pages+0x67/0x72 kernel: [] release_freepages+0x13a/0x191 kernel: [] compact_zone+0x845/0x1155 kernel: [] ? compaction_suitable+0x76/0x76 kernel: [] compact_zone_order+0xe0/0x167 kernel: [] ? compact_zone+0x1155/0x1155 kernel: [] try_to_compact_pages+0x2f1/0x648 kernel: [] ? try_to_compact_pages+0x2f1/0x648 kernel: [] ? compaction_zonelist_suitable+0x3a6/0x3a6 kernel: [] ? get_page_from_freelist+0x2c0/0x133c kernel: [] __alloc_pages_direct_compact+0xea/0x30d kernel: [] ? get_page_from_freelist+0x133c/0x133c kernel: [] ? drain_all_pages+0x1d6/0x205 kernel: [] __alloc_pages_nodemask+0x143d/0x16b6 kernel: [] ? debug_show_all_locks+0x226/0x226 kernel: [] ? warn_alloc_failed+0x24c/0x24c kernel: [] ? finish_wait+0x1a4/0x1b0 kernel: [] ? lock_acquire+0xec/0x147 kernel: [] ? _raw_spin_unlock_irqrestore+0x3b/0x5c kernel: [] ? _raw_spin_unlock_irqrestore+0x47/0x5c kernel: [] ? finish_wait+0x1a4/0x1b0 kernel: [] khugepaged+0x1d4/0x484f kernel: [] ? hugepage_vma_revalidate+0xef/0xef kernel: [] ? finish_task_switch+0x3de/0x484 kernel: [] ? _raw_spin_unlock_irq+0x27/0x45 kernel: [] ? trace_hardirqs_on_caller+0x3d2/0x492 kernel: [] ? prepare_to_wait_event+0x3f7/0x3f7 kernel: [] ? __schedule+0xa4d/0xd16 kernel: [] kthread+0x252/0x261 kernel: [] ? hugepage_vma_revalidate+0xef/0xef kernel: [] ? kthread_create_on_node+0x377/0x377 kernel: [] ret_from_fork+0x1f/0x40 kernel: [] ? kthread_create_on_node+0x377/0x377 -- Reboot -- -ss -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. 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