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Thu, 08 Aug 2019 16:57:52 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x78GXLnl105386; Thu, 8 Aug 2019 16:55:51 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 2u8pj82qfk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 08 Aug 2019 16:55:51 +0000 Received: from abhmp0022.oracle.com (abhmp0022.oracle.com [141.146.116.28]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x78GtlxC016879; Thu, 8 Aug 2019 16:55:47 GMT Received: from [192.168.1.222] (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 08 Aug 2019 09:55:47 -0700 Subject: Re: [PATCH] hugetlbfs: fix hugetlb page migration/fault race causing SIGBUS To: Michal Hocko Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, ltp@lists.linux.it, Li Wang , Naoya Horiguchi , Cyril Hrubis , xishi.qiuxishi@alibaba-inc.com, Andrew Morton References: <20190808000533.7701-1-mike.kravetz@oracle.com> <20190808074607.GI11812@dhcp22.suse.cz> <20190808074736.GJ11812@dhcp22.suse.cz> From: Mike Kravetz Message-ID: <416ee59e-9ae8-f72d-1b26-4d3d31501330@oracle.com> Date: Thu, 8 Aug 2019 09:55:45 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190808074736.GJ11812@dhcp22.suse.cz> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9342 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908080153 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9342 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908080153 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 8/8/19 12:47 AM, Michal Hocko wrote: > On Thu 08-08-19 09:46:07, Michal Hocko wrote: >> On Wed 07-08-19 17:05:33, Mike Kravetz wrote: >>> Li Wang discovered that LTP/move_page12 V2 sometimes triggers SIGBUS >>> in the kernel-v5.2.3 testing. This is caused by a race between hugetlb >>> page migration and page fault. >>> Reported-by: Li Wang >>> Fixes: 290408d4a250 ("hugetlb: hugepage migration core") >>> Signed-off-by: Mike Kravetz >>> Tested-by: Li Wang >> >> Acked-by: Michal Hocko > > Btw. is this worth marking for stable? I haven't seen it triggering > anywhere but artificial tests. On the other hand the patch is quite > straightforward so it shouldn't hurt in general. I don't think this really is material for stable. I added the tag as the stable AI logic seems to pick up patches whether marked for stable or not. For example, here is one I explicitly said did not need to go to stable. https://lkml.org/lkml/2019/6/1/165 Ironic to find that commit message in a stable backport. I'm happy to drop the Fixes tag. Andrew, can you drop the tag? Or would you like me to resend? -- Mike Kravetz