From: Yang Shi <yang.shi@linux.alibaba.com>
To: Qian Cai <cai@lca.pw>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux MM <linux-mm@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: list corruption in deferred_split_scan()
Date: Thu, 18 Jul 2019 17:59:50 -0700 [thread overview]
Message-ID: <7a0c0092-40d1-eede-14dd-3c4c052edf0c@linux.alibaba.com> (raw)
In-Reply-To: <9F50D703-FF08-44FA-B1E5-4F8A2F8C7061@lca.pw>
On 7/18/19 5:54 PM, Qian Cai wrote:
>
>> On Jul 12, 2019, at 3:12 PM, Yang Shi <yang.shi@linux.alibaba.com> wrote:
>>
>>
>>
>> On 7/11/19 2:07 PM, Qian Cai wrote:
>>> On Wed, 2019-07-10 at 17:16 -0700, Yang Shi wrote:
>>>> Hi Qian,
>>>>
>>>>
>>>> Thanks for reporting the issue. But, I can't reproduce it on my machine.
>>>> Could you please share more details about your test? How often did you
>>>> run into this problem?
>>> I can almost reproduce it every time on a HPE ProLiant DL385 Gen10 server. Here
>>> is some more information.
>>>
>>> # cat .config
>>>
>>> https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config
>> I tried your kernel config, but I still can't reproduce it. My compiler doesn't have retpoline support, so CONFIG_RETPOLINE is disabled in my test, but I don't think this would make any difference for this case.
>>
>> According to the bug call trace in the earlier email, it looks deferred _split_scan lost race with put_compound_page. The put_compound_page would call free_transhuge_page() which delete the page from the deferred split queue, but it may still appear on the deferred list due to some reason.
>>
>> Would you please try the below patch?
>>
>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
>> index b7f709d..66bd9db 100644
>> --- a/mm/huge_memory.c
>> +++ b/mm/huge_memory.c
>> @@ -2765,7 +2765,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
>> if (!mapcount && page_ref_freeze(head, 1 + extra_pins)) {
>> if (!list_empty(page_deferred_list(head))) {
>> ds_queue->split_queue_len--;
>> - list_del(page_deferred_list(head));
>> + list_del_init(page_deferred_list(head));
>> }
>> if (mapping)
>> __dec_node_page_state(page, NR_SHMEM_THPS);
>> @@ -2814,7 +2814,7 @@ void free_transhuge_page(struct page *page)
>> spin_lock_irqsave(&ds_queue->split_queue_lock, flags);
>> if (!list_empty(page_deferred_list(page))) {
>> ds_queue->split_queue_len--;
>> - list_del(page_deferred_list(page));
>> + list_del_init(page_deferred_list(page));
>> }
>> spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags);
>> free_compound_page(page);
> Unfortunately, I am no longer be able to reproduce the original list corruption with today’s linux-next.
It is because the patches have been dropped from -mm tree by Andrew due
to this problem I guess. You have to use next-20190711, or apply the
patches on today's linux-next.
next prev parent reply other threads:[~2019-07-19 0:59 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-10 21:43 list corruption in deferred_split_scan() Qian Cai
2019-07-11 0:16 ` Yang Shi
2019-07-11 21:07 ` Qian Cai
2019-07-12 19:12 ` Yang Shi
2019-07-13 4:41 ` Yang Shi
2019-07-15 21:23 ` Qian Cai
2019-07-16 0:22 ` Yang Shi
2019-07-16 1:36 ` Qian Cai
2019-07-16 3:00 ` Yang Shi
2019-07-16 23:36 ` Shakeel Butt
2019-07-17 0:12 ` Yang Shi
2019-07-17 17:02 ` Shakeel Butt
2019-07-17 17:09 ` Yang Shi
2019-07-19 0:54 ` Qian Cai
2019-07-19 0:59 ` Yang Shi [this message]
2019-07-24 18:10 ` Qian Cai
2019-07-14 3:53 ` Hillf Danton
2019-07-15 4:52 ` Yang Shi
2019-07-24 21:13 ` Qian Cai
2019-07-25 21:46 ` Yang Shi
2019-08-05 22:15 ` Yang Shi
2019-08-06 1:05 ` Qian Cai
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