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Mon, 06 May 2019 17:19:51 +0000 Received: from abhmp0009.oracle.com (abhmp0009.oracle.com [141.146.116.15]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x46HJkkf010497; Mon, 6 May 2019 17:19:46 GMT Received: from [192.168.1.222] (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 06 May 2019 10:19:46 -0700 Subject: Re: [PATCH v2] mm/hugetlb: Don't put_page in lock of hugetlb_lock To: Zhiqiang Liu , mhocko@suse.com, shenkai8@huawei.com, linfeilong@huawei.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, wangwang2@huawei.com, "Zhoukang (A)" , Mingfangsen , agl@us.ibm.com, nacc@us.ibm.com References: <12a693da-19c8-dd2c-ea6a-0a5dc9d2db27@huawei.com> From: Mike Kravetz Message-ID: <9405fcd5-a5a7-db4a-d613-acf2872f6e62@oracle.com> Date: Mon, 6 May 2019 10:19:44 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=gbk Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9249 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=2 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905060147 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9249 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905060147 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: On 5/6/19 7:06 AM, Zhiqiang Liu wrote: > 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 Good catch. Sorry, for the late reply. Reviewed-by: Mike Kravetz -- Mike Kravetz