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Thu, 18 May 2023 16:42:14 +0000 Received: from CY8PR10MB7243.namprd10.prod.outlook.com ([fe80::13d6:c3f3:2447:6559]) by CY8PR10MB7243.namprd10.prod.outlook.com ([fe80::13d6:c3f3:2447:6559%5]) with mapi id 15.20.6411.017; Thu, 18 May 2023 16:42:14 +0000 Message-ID: <05236dee-59b7-f394-db3d-cbb4d4163ce8@oracle.com> Date: Thu, 18 May 2023 11:42:12 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.1 Subject: Re: [RFC PATCH 1/8] signal: Dequeue SIGKILL even if SIGNAL_GROUP_EXIT/group_exec_task is set Content-Language: en-US To: Oleg Nesterov Cc: "Eric W. Biederman" , linux@leemhuis.info, nicolas.dichtel@6wind.com, axboe@kernel.dk, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, mst@redhat.com, sgarzare@redhat.com, jasowang@redhat.com, stefanha@redhat.com, brauner@kernel.org References: <20230518000920.191583-1-michael.christie@oracle.com> <20230518000920.191583-2-michael.christie@oracle.com> <87ednei9is.fsf@email.froward.int.ebiederm.org> <20230518162508.GB20779@redhat.com> From: Mike Christie In-Reply-To: <20230518162508.GB20779@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DS7PR05CA0003.namprd05.prod.outlook.com (2603:10b6:5:3b9::8) To CY8PR10MB7243.namprd10.prod.outlook.com (2603:10b6:930:7c::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY8PR10MB7243:EE_|IA1PR10MB7539:EE_ X-MS-Office365-Filtering-Correlation-Id: f44eb4ac-7586-4035-640b-08db57bed5b0 X-MS-Exchange-SenderADCheck: 1 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Gk5zQEEjBkA30+qpjiacrqY1UKPtG7KXTRo3B5z+U+qMbpEOYRLaI1TiTd42LEkZD/h2P7lt7bB2EtXo+e6pLwnwsMjTaMJgBefJq54Bsoc= X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR10MB7539 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-05-18_13,2023-05-17_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 spamscore=0 mlxlogscore=861 malwarescore=0 bulkscore=0 adultscore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2305180135 X-Proofpoint-GUID: j8eTdZ2ndcTUidJD7dU6jAfTyLz-1HOV X-Proofpoint-ORIG-GUID: j8eTdZ2ndcTUidJD7dU6jAfTyLz-1HOV Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/18/23 11:25 AM, Oleg Nesterov wrote: > I too do not understand the 1st change in this patch ... > > On 05/18, Mike Christie wrote: >> >> In the other patches we do: >> >> if (get_signal(ksig)) >> start_exit_cleanup_by_stopping_newIO() >> flush running IO() >> exit() >> >> But to do the flush running IO() part of this I need to wait for it so >> that's why I wanted to be able to dequeue the SIGKILL and clear the >> TIF_SIGPENDING bit. > > But get_signal() will do what you need, dequeue SIGKILL and clear SIGPENDING ? > > if ((signal->flags & SIGNAL_GROUP_EXIT) || > signal->group_exec_task) { > clear_siginfo(&ksig->info); > ksig->info.si_signo = signr = SIGKILL; > sigdelset(¤t->pending.signal, SIGKILL); > > this "dequeues" SIGKILL, > > trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO, > &sighand->action[SIGKILL - 1]); > recalc_sigpending(); > > this clears TIF_SIGPENDING. > I see what you guys meant. TIF_SIGPENDING isn't getting cleared. I'll dig into why.