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Wed, 7 Apr 2021 17:15:08 +0000 Received: from DBAPR08MB5814.eurprd08.prod.outlook.com ([fe80::2994:a01e:2de:f94e]) by DBAPR08MB5814.eurprd08.prod.outlook.com ([fe80::2994:a01e:2de:f94e%7]) with mapi id 15.20.3999.032; Wed, 7 Apr 2021 17:15:07 +0000 From: Honnappa Nagarahalli To: Luc Pelletier , "olivier.matz@6wind.com" , "jianfeng.tan@intel.com" CC: "dev@dpdk.org" , "stable@dpdk.org" , nd , Honnappa Nagarahalli , nd Thread-Topic: [PATCH v7] eal: fix race in ctrl thread creation Thread-Index: AQHXK8YtV456JnGi00mYYkTWQ01X6aqpRjWQ Date: Wed, 7 Apr 2021 17:15:07 +0000 Message-ID: References: <20210407145722.GN1650@platinum> <20210407152903.130730-1-lucp.at.work@gmail.com> In-Reply-To: <20210407152903.130730-1-lucp.at.work@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ts-tracking-id: F59FE8FB7F80AE4FBADC3C1EDF116DB5.0 x-checkrecipientchecked: true Authentication-Results-Original: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; 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CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFS:(4636009)(376002)(136003)(346002)(396003)(39860400002)(46966006)(36840700001)(81166007)(8936002)(2906002)(356005)(54906003)(110136005)(316002)(55016002)(9686003)(8676002)(86362001)(36860700001)(82740400003)(7696005)(5660300002)(450100002)(70586007)(82310400003)(52536014)(336012)(6506007)(4326008)(186003)(83380400001)(26005)(33656002)(47076005)(478600001)(70206006); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Apr 2021 17:15:20.3796 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 189b411d-8315-44d1-9288-08d8f9e8b8f7 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT049.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR08MB5097 Subject: Re: [dpdk-dev] [PATCH v7] eal: fix race in ctrl thread creation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" > Subject: [PATCH v7] eal: fix race in ctrl thread creation >=20 > The creation of control threads uses a pthread barrier for synchronizatio= n. > This patch fixes a race condition where the pthread barrier could get > destroyed while one of the threads has not yet returned from the > pthread_barrier_wait function, which could result in undefined behaviour. >=20 > Fixes: 3a0d465d4c53 ("eal: fix use-after-free on control thread creation"= ) > Cc: jianfeng.tan@intel.com > Cc: stable@dpdk.org >=20 > Signed-off-by: Luc Pelletier Overall, this LGTM. Just wondering if this should be split into 2 commits. 1) Fix the race condition with refcnt. 2) Remove the use of pthread_cancel I have some observations below. > --- >=20 > Hi Olivier, >=20 > Olivier, thanks for pointing out that pthread_barrier_wait acts as a full > memory barrier; I didn't know that was explicitly specified in the "full memory barrier" just says that the memory operations prior and after = the barrier will not be mixed. It does not guarantee that the modification = done by one core are 'visible' to other cores. Additional code is required = to ensure that the modifications are visible. For ex: in the following code= setting start_routine=3DNULL is not guaranteed to be visible to other core= s if pthread_barrier_wait is just a full barrier. The particular wording used in the reference is "synchronize memory with re= spect to other threads". I am not exactly sure what is means, but may be sa= fe to assume it means the updates are 'visible' to other cores (as the lock= ing APIs are part of the list and they guarantee the visibility aspects). May be we can simplify this during 21.11 release as we will have the abilit= y to make more invasive changes. > documentation. I've changed it to use a regular read/write. >=20 > Hi Honnappa, >=20 > I have not changed the code to use pthread_attr_setaffinity_np because th= e > attr parameter is const. I could make a copy of the provided attributes a= nd > use that instead, but I think this would still violate the spirit of the = API and, > AFAICT, there's no official mechanism for copying a pthread_attr_t. Ok, thank you. >=20 > Please let me know what you think. >=20 > lib/librte_eal/common/eal_common_thread.c | 63 +++++++++++++---------- > 1 file changed, 35 insertions(+), 28 deletions(-) >=20 > diff --git a/lib/librte_eal/common/eal_common_thread.c > b/lib/librte_eal/common/eal_common_thread.c > index 73a055902..d4e09f84b 100644 > --- a/lib/librte_eal/common/eal_common_thread.c > +++ b/lib/librte_eal/common/eal_common_thread.c > @@ -170,25 +170,34 @@ struct rte_thread_ctrl_params { > void *(*start_routine)(void *); > void *arg; > pthread_barrier_t configured; > + unsigned int refcnt; > }; >=20 > +static void ctrl_params_free(struct rte_thread_ctrl_params *params) { > + if (__atomic_sub_fetch(¶ms->refcnt, 1, __ATOMIC_ACQ_REL) =3D=3D > 0) { > + pthread_barrier_destroy(¶ms->configured); > + free(params); > + } > +} > + > static void *ctrl_thread_init(void *arg) { > - int ret; > struct internal_config *internal_conf =3D > eal_get_internal_configuration(); > rte_cpuset_t *cpuset =3D &internal_conf->ctrl_cpuset; > struct rte_thread_ctrl_params *params =3D arg; > - void *(*start_routine)(void *) =3D params->start_routine; > + void *(*start_routine)(void *); > void *routine_arg =3D params->arg; >=20 > __rte_thread_init(rte_lcore_id(), cpuset); >=20 > - ret =3D pthread_barrier_wait(¶ms->configured); > - if (ret =3D=3D PTHREAD_BARRIER_SERIAL_THREAD) { > - pthread_barrier_destroy(¶ms->configured); > - free(params); > - } > + pthread_barrier_wait(¶ms->configured); > + start_routine =3D params->start_routine; > + ctrl_params_free(params); > + > + if (start_routine =3D=3D NULL) > + return NULL; >=20 > return start_routine(routine_arg); > } > @@ -210,14 +219,15 @@ rte_ctrl_thread_create(pthread_t *thread, const > char *name, >=20 > params->start_routine =3D start_routine; > params->arg =3D arg; > + params->refcnt =3D 2; >=20 > - pthread_barrier_init(¶ms->configured, NULL, 2); > + ret =3D pthread_barrier_init(¶ms->configured, NULL, 2); > + if (ret !=3D 0) > + goto fail_no_barrier; >=20 > ret =3D pthread_create(thread, attr, ctrl_thread_init, (void *)params); > - if (ret !=3D 0) { > - free(params); > - return -ret; > - } > + if (ret !=3D 0) > + goto fail_with_barrier; >=20 > if (name !=3D NULL) { > ret =3D rte_thread_setname(*thread, name); @@ -227,25 > +237,22 @@ rte_ctrl_thread_create(pthread_t *thread, const char *name, > } >=20 > ret =3D pthread_setaffinity_np(*thread, sizeof(*cpuset), cpuset); > - if (ret) > - goto fail; > + if (ret !=3D 0) > + params->start_routine =3D NULL; > + pthread_barrier_wait(¶ms->configured); > + ctrl_params_free(params); >=20 > - ret =3D pthread_barrier_wait(¶ms->configured); > - if (ret =3D=3D PTHREAD_BARRIER_SERIAL_THREAD) { > - pthread_barrier_destroy(¶ms->configured); > - free(params); > - } > + if (ret !=3D 0) A comment here on why the pthread_join will not wait indefinitely will help= . Splitting the patch will also help understand the changes better. > + pthread_join(*thread, NULL); >=20 > - return 0; > + return -ret; > + > +fail_with_barrier: > + pthread_barrier_destroy(¶ms->configured); > + > +fail_no_barrier: > + free(params); >=20 > -fail: > - if (PTHREAD_BARRIER_SERIAL_THREAD =3D=3D > - pthread_barrier_wait(¶ms->configured)) { > - pthread_barrier_destroy(¶ms->configured); > - free(params); > - } > - pthread_cancel(*thread); > - pthread_join(*thread, NULL); > return -ret; > } >=20 > -- > 2.25.1