linux-kernel - Re: kernel BUG at mm/vmscan.c:LINE! (2)

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Date:   Mon, 28 Oct 2019 17:18:19 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Minchan Kim <minchan@...nel.org>,
        syzbot <syzbot+8e6326965378936537c3@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, chris@...isdown.name, chris@...kel.net,
        dancol@...gle.com, dave.hansen@...el.com, hannes@...xchg.org,
        hdanton@...a.com, james.bottomley@...senpartnership.com,
        kirill.shutemov@...ux.intel.com, ktkhai@...tuozzo.com,
        laoar.shao@...il.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, mgorman@...hsingularity.net, mhocko@...nel.org,
        mhocko@...e.com, oleksandr@...hat.com, ralf@...ux-mips.org,
        rth@...ddle.net, sfr@...b.auug.org.au, shakeelb@...gle.com,
        sonnyrao@...gle.com, surenb@...gle.com,
        syzkaller-bugs@...glegroups.com, timmurray@...gle.com,
        yang.shi@...ux.alibaba.com
Subject: Re: kernel BUG at mm/vmscan.c:LINE! (2)

On 02.08.19 22:06, Minchan Kim wrote:
> On Fri, Aug 02, 2019 at 10:58:05AM -0700, syzbot wrote:
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit:    0d8b3265 Add linux-next specific files for 20190729
>> git tree:       linux-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=1663c7d0600000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=ae96f3b8a7e885f7
>> dashboard link: https://syzkaller.appspot.com/bug?extid=8e6326965378936537c3
>> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=133c437c600000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15645854600000
>>
>> The bug was bisected to:
>>
>> commit 06a833a1167e9cbb43a9a4317ec24585c6ec85cb
>> Author: Minchan Kim <minchan@...nel.org>
>> Date:   Sat Jul 27 05:12:38 2019 +0000
>>
>>      mm: introduce MADV_PAGEOUT
>>
>> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1545f764600000
>> final crash:    https://syzkaller.appspot.com/x/report.txt?x=1745f764600000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=1345f764600000
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+8e6326965378936537c3@...kaller.appspotmail.com
>> Fixes: 06a833a1167e ("mm: introduce MADV_PAGEOUT")
>>
>> raw: 01fffc0000090025 dead000000000100 dead000000000122 ffff88809c49f741
>> raw: 0000000000020000 0000000000000000 00000002ffffffff ffff88821b6eaac0
>> page dumped because: VM_BUG_ON_PAGE(PageActive(page))
>> page->mem_cgroup:ffff88821b6eaac0
>> ------------[ cut here ]------------
>> kernel BUG at mm/vmscan.c:1156!
>> invalid opcode: 0000 [#1] PREEMPT SMP KASAN
>> CPU: 1 PID: 9846 Comm: syz-executor110 Not tainted 5.3.0-rc2-next-20190729
>> #54
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> RIP: 0010:shrink_page_list+0x2872/0x5430 mm/vmscan.c:1156
> 
> My old version had PG_active flag clear but it seems to lose it with revising
> patchsets. Thanks, Sizbot!
> 
>  From 66d64988619ef7e86b0002b2fc20fdf5b84ad49c Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@...nel.org>
> Date: Sat, 3 Aug 2019 04:54:02 +0900
> Subject: [PATCH] mm: Clear PG_active on MADV_PAGEOUT
> 
> shrink_page_list expects every pages as argument should be no active
> LRU pages so we need to clear PG_active.
> 
> Reported-by: syzbot+8e6326965378936537c3@...kaller.appspotmail.com
> Fixes: 06a833a1167e ("mm: introduce MADV_PAGEOUT")

I think this should be

Fixed: 1a4e58cce84e ("mm: introduce MADV_PAGEOUT")


$ git show 1a4e58cce84e
commit 1a4e58cce84ee88129d5d49c064bd2852b481357
Author: Minchan Kim <minchan@...nel.org>
Date:   Wed Sep 25 16:49:15 2019 -0700

     mm: introduce MADV_PAGEOUT
[...]

$ git tag --contains 1a4e58cce84ee88129d5d49c064bd2852b481357
[...]
v5.4-rc5


-- 

Thanks,

David / dhildenb