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[45.249.212.190]) by mx.google.com with ESMTPS id x10si6400794otk.163.2019.05.06.07.06.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 06 May 2019 07:06:53 -0700 (PDT) Received-SPF: pass (google.com: domain of liuzhiqiang26@huawei.com designates 45.249.212.190 as permitted sender) client-ip=45.249.212.190; Authentication-Results: mx.google.com; spf=pass (google.com: domain of liuzhiqiang26@huawei.com designates 45.249.212.190 as permitted sender) smtp.mailfrom=liuzhiqiang26@huawei.com Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id B5049A20A38C0258464B; Mon, 6 May 2019 22:06:47 +0800 (CST) Received: from [127.0.0.1] (10.184.225.177) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.439.0; Mon, 6 May 2019 22:06:39 +0800 Subject: [PATCH v2] mm/hugetlb: Don't put_page in lock of hugetlb_lock From: Zhiqiang Liu To: , , , CC: , , , "Zhoukang (A)" , Mingfangsen , , References: <12a693da-19c8-dd2c-ea6a-0a5dc9d2db27@huawei.com> Message-ID: Date: Mon, 6 May 2019 22:06:38 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: <12a693da-19c8-dd2c-ea6a-0a5dc9d2db27@huawei.com> Content-Type: text/plain; charset="gbk" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.184.225.177] X-CFilter-Loop: Reflected X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Kai Shen spinlock recursion happened when do LTP test: #!/bin/bash ./runltp -p -f hugetlb & ./runltp -p -f hugetlb & ./runltp -p -f hugetlb & ./runltp -p -f hugetlb & ./runltp -p -f hugetlb & The dtor returned by get_compound_page_dtor in __put_compound_page may be the function of free_huge_page which will lock the hugetlb_lock, so don't put_page in lock of hugetlb_lock. BUG: spinlock recursion on CPU#0, hugemmap05/1079 lock: hugetlb_lock+0x0/0x18, .magic: dead4ead, .owner: hugemmap05/1079, .owner_cpu: 0 Call trace: dump_backtrace+0x0/0x198 show_stack+0x24/0x30 dump_stack+0xa4/0xcc spin_dump+0x84/0xa8 do_raw_spin_lock+0xd0/0x108 _raw_spin_lock+0x20/0x30 free_huge_page+0x9c/0x260 __put_compound_page+0x44/0x50 __put_page+0x2c/0x60 alloc_surplus_huge_page.constprop.19+0xf0/0x140 hugetlb_acct_memory+0x104/0x378 hugetlb_reserve_pages+0xe0/0x250 hugetlbfs_file_mmap+0xc0/0x140 mmap_region+0x3e8/0x5b0 do_mmap+0x280/0x460 vm_mmap_pgoff+0xf4/0x128 ksys_mmap_pgoff+0xb4/0x258 __arm64_sys_mmap+0x34/0x48 el0_svc_common+0x78/0x130 el0_svc_handler+0x38/0x78 el0_svc+0x8/0xc Fixes: 9980d744a0 ("mm, hugetlb: get rid of surplus page accounting tricks") Signed-off-by: Kai Shen Signed-off-by: Feilong Lin Reported-by: Wang Wang Acked-by: Michal Hocko --- v1->v2: add Acked-by: Michal Hocko mm/hugetlb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 6cdc7b2..c1e7b81 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1574,8 +1574,9 @@ static struct page *alloc_surplus_huge_page(struct hstate *h, gfp_t gfp_mask, */ if (h->surplus_huge_pages >= h->nr_overcommit_huge_pages) { SetPageHugeTemporary(page); + spin_unlock(&hugetlb_lock); put_page(page); - page = NULL; + return NULL; } else { h->surplus_huge_pages++; h->surplus_huge_pages_node[page_to_nid(page)]++; -- 1.8.3.1