Re: mm: BUG in page_move_anon_rmap

Dmitry Vyukov
2016-07-01T16:12:00Z

On Fri, Jul 1, 2016 at 6:03 PM, Andrey Ryabinin <aryabinin@virtuozzo.com> wrote:
>
>
> On 07/01/2016 06:31 PM, Dmitry Vyukov wrote:
>> Hello,
>>
>> I am getting the following crashes while running syzkaller fuzzer on
>> 00bf377d19ad3d80cbc7a036521279a86e397bfb (Jun 29). So far I did not
>> manage to reproduce it outside of fuzzer, but fuzzer hits it once per
>> hour or so.
>>
>> flags: 0xfffe0000044079(locked|uptodate|dirty|lru|active|head|swapbacked)
>
> This report is incomplete. It lacks one line ahead with page address, mapcount, index, etc.
>
>> page dumped because: VM_BUG_ON_PAGE(page->index !=
>> linear_page_index(vma, address))
>> page->mem_cgroup:ffff88003e829be0
>> ------------[ cut here ]------------
>> kernel BUG at mm/rmap.c:1103!
>> invalid opcode: 0000 [#2] SMP DEBUG_PAGEALLOC KASAN
>> Modules linked in:
>> CPU: 0 PID: 7043 Comm: syz-fuzzer Tainted: G D 4.7.0-rc5+ #22
>
> So the kernel is already tainted. Can you show us the first oops message?

Here are 3 reports on non tainted kernels: