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Date:	Thu, 02 Jan 2014 14:36:42 +0800
From:	Bob Liu <bob.liu@...cle.com>
To:	Sasha Levin <sasha.levin@...cle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, khlebnikov@...nvz.org,
	LKML <linux-kernel@...r.kernel.org>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: mm: kernel BUG at include/linux/swapops.h:131!


On 12/24/2013 01:24 AM, Sasha Levin wrote:
> Ping?
> 
> I've also Cc'ed the "this page shouldn't be locked at all" team.
> 

I have no idea why this BUG_ON was triggered.
And it looks like 'mm: kernel BUG at mm/huge_memory.c:1440!' have the
same call trace with this one. Perhaps they were introduced by the same
reason.
Could you confirm whether those issues exist in v3.13-rc6?

Thanks,
-Bob

> On 12/18/2013 10:37 AM, Sasha Levin wrote:
>> Hi all,
>>
>> While fuzzing with trinity inside a KVM tools guest running latest
>> -next kernel, I've stumbled on
>> the following spew.
>>
>> The code is in zap_pte_range():
>>
>>                  if (!non_swap_entry(entry))
>>                          rss[MM_SWAPENTS]--;
>>                  else if (is_migration_entry(entry)) {
>>                          struct page *page;
>>
>>                          page = migration_entry_to_page(entry);   
>> <==== HERE
>>
>>                          if (PageAnon(page))
>>                                  rss[MM_ANONPAGES]--;
>>                          else
>>                                  rss[MM_FILEPAGES]--;
>>
>>
>> [ 2622.589064] kernel BUG at include/linux/swapops.h:131!
>> [ 2622.589064] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
>> [ 2622.589064] Dumping ftrace buffer:
>> [ 2622.589064]    (ftrace buffer empty)
>> [ 2622.589064] Modules linked in:
>> [ 2622.589064] CPU: 9 PID: 15984 Comm: trinity-child16 Tainted:
>> G        W    3.13.0-rc
>> 4-next-20131217-sasha-00013-ga878504-dirty #4150
>> [ 2622.589064] task: ffff88168346b000 ti: ffff8816561d8000 task.ti:
>> ffff8816561d8000
>> [ 2622.589064] RIP: 0010:[<ffffffff8127c730>]  [<ffffffff8127c730>]
>> zap_pte_range+0x360
>> /0x4a0
>> [ 2622.589064] RSP: 0018:ffff8816561d9c18  EFLAGS: 00010246
>> [ 2622.589064] RAX: ffffea00736a6600 RBX: ffff88200299d068 RCX:
>> 0000000000000009
>> [ 2622.589064] RDX: 022fffff80380000 RSI: ffffea0000000000 RDI:
>> 3c00000001cda998
>> [ 2622.589064] RBP: ffff8816561d9cb8 R08: 0000000000000000 R09:
>> 0000000000000000
>> [ 2622.589064] R10: 0000000000000001 R11: 0000000000000000 R12:
>> 00007fc7ee20d000
>> [ 2622.589064] R13: ffff8816561d9de8 R14: 000000039b53303c R15:
>> 00007fc7ee29b000
>> [ 2622.589064] FS:  00007fc7eeceb700(0000) GS:ffff882011a00000(0000)
>> knlGS:000000000000
>> 0000
>> [ 2622.589064] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>> [ 2622.589064] CR2: 000000000068c000 CR3: 0000000005c26000 CR4:
>> 00000000000006e0
>> [ 2622.589064] Stack:
>> [ 2622.589064]  ffff8816561d9c58 0000000000000286 ffff88168327b060
>> ffff88168327b060
>> [ 2622.589064]  00007fc700000160 ffff881667067b88 00000000c8f4b120
>> 00ff88168327b060
>> [ 2622.589064]  ffff88168327b060 ffff8820051a8600 0000000000000000
>> ffff88168327b000
>> [ 2622.589064] Call Trace:
>> [ 2622.589064]  [<ffffffff8127cc5e>] unmap_page_range+0x3ee/0x400
>> [ 2622.589064]  [<ffffffff8127cd71>] unmap_single_vma+0x101/0x120
>> [ 2622.589064]  [<ffffffff8127cdf1>] unmap_vmas+0x61/0xa0
>> [ 2622.589064]  [<ffffffff81283980>] exit_mmap+0xd0/0x170
>> [ 2622.589064]  [<ffffffff8112d430>] mmput+0x70/0xe0
>> [ 2622.589064]  [<ffffffff8113144d>] exit_mm+0x18d/0x1a0
>> [ 2622.589064]  [<ffffffff811defb5>] ? acct_collect+0x175/0x1b0
>> [ 2622.589064]  [<ffffffff8113389f>] do_exit+0x24f/0x500
>> [ 2622.589064]  [<ffffffff81133bf9>] do_group_exit+0xa9/0xe0
>> [ 2622.589064]  [<ffffffff81133c47>] SyS_exit_group+0x17/0x20
>> [ 2622.589064]  [<ffffffff843a6150>] tracesys+0xdd/0xe2
>> [ 2622.589064] Code: 83 f8 1f 75 46 48 b8 ff ff ff ff ff ff ff 01 48
>> be 00 00 00 00 00 ea ff ff 48
>> 21 f8 48 c1 e0 06 48 01 f0 48 8b 10 80 e2 01 75 0a <0f> 0b 66 0f 1f 44
>> 00 00 eb fe f6 40 08 01 74 05
>> ff 4d c4 eb 0b
>> [ 2622.589064] RIP  [<ffffffff8127c730>] zap_pte_range+0x360/0x4a0
>> [ 2622.589064]  RSP <ffff8816561d9c18>
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