From: zhong jiang <zhongjiang@huawei.com>
To: Michal Hocko <mhocko@kernel.org>,
Anshuman Khandual <khandual@linux.vnet.ibm.com>,
Matthew Wilcox <willy@infradead.org>,
Andrea Arcangeli <aarcange@redhat.com>,
David Rientjes <rientjes@google.com>,
Vlastimil Babka <vbabka@suse.cz>,
"'Kirill A . Shutemov'" <kirill.shutemov@linux.intel.com>
Cc: Linux Memory Management List <linux-mm@kvack.org>
Subject: [Question] There is a thp count left when the process exits
Date: Thu, 8 Nov 2018 23:01:47 +0800 [thread overview]
Message-ID: <5BE44FDB.6040303@huawei.com> (raw)
Hi,
Recently, I hit the following issue in linux 3.10 stable. and hard to recur.
bad pmd ffff880c13ecea80(80000017b16000e7)
Call Trace:
[<ffffffff8164195f>] dump_stack+0x19/0x1b
[<ffffffff8107b230>] warn_slowpath_common+0x70/0xb0
[<ffffffff8107b37a>] warn_slowpath_null+0x1a/0x20
[<ffffffff811a2b86>] exit_mmap+0x196/0x1a0
[<ffffffff810782e7>] mmput+0x67/0xf0
[<ffffffff81081b2c>] do_exit+0x28c/0xa60
[<ffffffff810a9dc0>] ? hrtimer_get_res+0x50/0x50
[<ffffffff8108237f>] do_group_exit+0x3f/0xa0
[<ffffffff81093240>] get_signal_to_deliver+0x1d0/0x6d0
[<ffffffff81014427>] do_signal+0x57/0x6b0
[<ffffffff810e4f92>] ? futex_wait_queue_me+0xa2/0x120
[<ffffffff8164d323>] ? __do_page_fault+0x183/0x470
[<ffffffff81014adf>] do_notify_resume+0x5f/0xb0
[<ffffffff816520bd>] int_signal+0x12/0x17
BUG: Bad rss-counter state mm:ffff8820136b5dc0 idx:1 val:512
The pmd entry show that it is still a thp. but It fails to check and clear the pmd.
hence, page fault will produce a new page for pmd when accessing the page,
which thp count will reduplicative increase.
Thanks,
zhong jiang
next reply other threads:[~2018-11-08 15:02 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-08 15:01 zhong jiang [this message]
2018-11-09 2:24 ` [Question] There is a thp count left when the process exits zhong jiang
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