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Groups > linux.kernel > #1646690
| From | Xishi Qiu <qiuxishi@huawei.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: mm, something wring in page_lock_anon_vma_read()? |
| Date | 2017-05-22 12:00 +0200 |
| Message-ID | <tJSi6-44C-19@gated-at.bofh.it> (permalink) |
| References | (3 earlier) <tIYfT-57-1@gated-at.bofh.it> <tJ1ns-2mZ-1@gated-at.bofh.it> <tJ209-2WG-3@gated-at.bofh.it> <tJ2jv-39J-3@gated-at.bofh.it> <tJ2CR-3nU-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 2017/5/20 10:40, Hugh Dickins wrote:
> On Sat, 20 May 2017, Xishi Qiu wrote:
>>
>> Here is a bug report form redhat: https://bugzilla.redhat.com/show_bug.cgi?id=1305620
>> And I meet the bug too. However it is hard to reproduce, and
>> 624483f3ea82598("mm: rmap: fix use-after-free in __put_anon_vma") is not help.
>>
>> From the vmcore, it seems that the page is still mapped(_mapcount=0 and _count=2),
>> and the value of mapping is a valid address(mapping = 0xffff8801b3e2a101),
>> but anon_vma has been corrupted.
>>
>> Any ideas?
>
> Sorry, no. I assume that _mapcount has been misaccounted, for example
> a pte mapped in on top of another pte; but cannot begin tell you where
Hi Hugh,
What does "a pte mapped in on top of another pte" mean? Could you give more info?
Thanks,
Xishi Qiu
> in Red Hat's kernel-3.10.0-229.4.2.el7 that might happen.
>
> Hugh
>
> .
>
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mm, something wring in page_lock_anon_vma_read()? Xishi Qiu <qiuxishi@huawei.com> - 2017-05-18 12:00 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Xishi Qiu <qiuxishi@huawei.com> - 2017-05-19 11:00 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Xishi Qiu <qiuxishi@huawei.com> - 2017-05-19 11:50 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Hugh Dickins <hughd@google.com> - 2017-05-20 00:10 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Xishi Qiu <qiuxishi@huawei.com> - 2017-05-20 03:30 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Hugh Dickins <hughd@google.com> - 2017-05-20 04:10 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Xishi Qiu <qiuxishi@huawei.com> - 2017-05-20 04:30 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Hugh Dickins <hughd@google.com> - 2017-05-20 04:50 +0200
Re: mm, something wring in page_lock_anon_vma_read()? zhong jiang <zhongjiang@huawei.com> - 2017-05-20 05:10 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Vlastimil Babka <vbabka@suse.cz> - 2017-05-22 19:00 +0200
Re: mm, something wring in page_lock_anon_vma_read()? zhong jiang <zhongjiang@huawei.com> - 2017-05-23 11:30 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Vlastimil Babka <vbabka@suse.cz> - 2017-05-23 11:40 +0200
Re: mm, something wring in page_lock_anon_vma_read()? zhong jiang <zhongjiang@huawei.com> - 2017-05-23 12:40 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Xishi Qiu <qiuxishi@huawei.com> - 2017-05-22 12:00 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Hugh Dickins <hughd@google.com> - 2017-05-22 21:30 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Xishi Qiu <qiuxishi@huawei.com> - 2017-05-23 04:30 +0200
Re: mm, something wring in page_lock_anon_vma_read()? Hugh Dickins <hughd@google.com> - 2017-05-23 05:00 +0200
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