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emacs 30.2 From: Petr Machata To: Jakub Kicinski CC: , , , , , , , , , , Subject: Re: [PATCH net-next 1/3] selftests: net: py: avoid masking exceptions in bkg() failures Date: Tue, 24 Feb 2026 14:28:01 +0100 In-Reply-To: <20260223202633.4126087-2-kuba@kernel.org> Message-ID: <877bs2gtjl.fsf@nvidia.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-ClientProxiedBy: rnnvmail201.nvidia.com (10.129.68.8) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B071:EE_|MN0PR12MB5882:EE_ X-MS-Office365-Filtering-Correlation-Id: da4752c4-fa6e-4128-e36d-08de73a8a195 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|376014|7416014|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?j240lZkMSoJzwgpV6L4LBNonxFswn3KkfBj+fR600TESR84XUPvQm40KwPqn?= =?us-ascii?Q?R/JDxqYlgg7EDEdqjuZWPX8xkOE7/nAgYPUGYA03jXrw5sKqm0aoSZsCOauL?= =?us-ascii?Q?z9wEq5UjYeLo65ySoIM9gS4TAvXI3s8/u9dYKfr71B3kjorCcdxA9UfINTGI?= =?us-ascii?Q?Y0tH0YXInf/cjVEsPwgXGBdGo7NYg1Jp1Zfaq9QBBOPDCLKw9JRQM4+PypFC?= =?us-ascii?Q?YDRHM4BkeK1LM3Nl93O5ATF0yQwxytSNNd38tw9ng1UAWH1MRvBx2lVH8c3s?= =?us-ascii?Q?eaDmefxuPKzpgWQW5d7d8wbxUu5+pHUfKcRJ2dsG7GqUFNvTGCamDJSnkx4o?= =?us-ascii?Q?f2qaWU0lwrypwLurqu5gpaES37H7od1wFlacjMwDoF0/y9FqY48MX5oVRj+p?= =?us-ascii?Q?lCViI3bbFZgUb4Grgng8S/r7+fkbpD+E+WoQgwR1gojV2H1F+Ar89796i6Ks?= =?us-ascii?Q?jGrSvayqoYp9zcFGFqhUwCJ8eQf+3D39TQPIPYMC+p2vNmPi7fxhpvbpezR0?= =?us-ascii?Q?UHV6nAbhK8ipuibTVWUnccM8gmRiQrrnj6E35ZtcDNaPX52xLInJzIwQRzH2?= =?us-ascii?Q?R07yLodsc+gBt9QgAtU8sMKh6YvXpYt9yCu293ykswd0ML7vDV82xSRu9loL?= =?us-ascii?Q?Tp5oDex3Ie5GBXFYRkwNmBLKxJlBSrobdNMtsFn2GK4IksK2N3lBuMmKgek8?= =?us-ascii?Q?VP5nbi08/PVqI6wfzOFmoXjlShfFrnliwe6kD2P5LmCyrpzenJpzDmJQjw9T?= =?us-ascii?Q?XGpVYbdZsQ2dQoXynv+MF2vlRkBvgb2RWlH++N7Gb+2Ak6HkY/XIjtciF9IU?= =?us-ascii?Q?uaKJIimj798NNIBbCra3+WTHj0SCcvASHf7AEg1cUMoOdAWC+o91wuYkAVSS?= =?us-ascii?Q?UdV/U446bLEJtq6M+JasebeFJA3GIjDPWewUP2DsoE9mhvu/2gEFPgjAS5bF?= =?us-ascii?Q?MGpN1bSSxr/fegq9+8aDu2DWkF4Eh+jBmkehbt0jmhGl8eRub4JcqUDCCk8i?= =?us-ascii?Q?DU7CxvgMuzTTLsAV5JAP6WWshWCO134Qrsou1ileUbdwAjevNtWRnbOmVb83?= =?us-ascii?Q?UAFQyqT0Gfxf4b9lYiIXVINNsqCcagJCsGYzH56OBm27vGoSzvaqqCZsnwyK?= =?us-ascii?Q?HvAbJttavK+P5vXUQ8XYSCDKjys+OqeQCISBvDXh2jnGeSqkwnq73cnrS1kQ?= =?us-ascii?Q?gZo0rbhRoreRb1Ye2LRiKdeCE6s2sEe6gzbFeoEgcfBUQlw8OeyIrJWS9EGq?= =?us-ascii?Q?9rz9MVMYkMSrepG69CN0q0HEAlyjS0C6Tnx6slC3ob3Dpy8+BwBKDdDIyWDy?= =?us-ascii?Q?jevCcpY/P7i0n7+Uc0/hK/egg9P/K2kugDyUbJckE6h6/JcZk/mWgcz4nxng?= =?us-ascii?Q?Up4rmPNbuWCbzw9Ybw5hMZOhzMp9218yQ2i7CIpCIUAYbt7Py2kLU4CaCqBm?= =?us-ascii?Q?6ULZYtAznIGjdAjNj1kkAEyalHrzimL0Wg9u70Z2WM1z3xDUuawAzxRAuVpP?= =?us-ascii?Q?la8vNd0nm/3tSNnBAemvBpD9NycfIoSeZtiNxU04Tlw4u97xya1oioHQZEcm?= =?us-ascii?Q?InXyHaxaQlmVKSw+pwrpvoYa8BqrUfjs3ppAGV78jZjP/D9h9bMv0M8A1HN/?= =?us-ascii?Q?pE4jquKVfy5bhcySZGNnkQjQZJwSCjojaEOaCu3YPP+IvOKZTroqveJdJbPi?= =?us-ascii?Q?vNp22A=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700013)(376014)(7416014)(82310400026);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 2oUSJqtJQVwgbcju6Xd6BADA9QXqVgmJWrBbdpkG/slnxn5ahqnkEJTvdlD4SBAUTqUYE+Szowmcizl5mkbyA6xP+vFiO+zj0feiHuuQ4iIQzRpHLY792huuw8UL9ecNVvyg7BxZvm7yrnnCurLpRufRJZiJpum62zL9l//Aj4hkuy5aTqzsvuK5NIkaGuub0ZH6iIdaPEnGzAcPbW+xmCsHIw1mSAgvm2MBgTqyLhidddDqS8NIOzYBkIt+ceZWfPUZ4ECz0TTd8ajZAE2RCbbN8Yg8oiU9HKUkZUshirDaEJdGZ4JtHMP/P1ATnOBJotFcBpOWpBmhIOc0DGI+LAvXgXO2MWKuS3ptv2cymugJLZ4oD2Wfd6mCibF21hsX5Pm6Q0gt/e5fHrqSBV6e4G9YGkhjLu8BDTlK4//+SluLsj/O4liyrJGDsOaO8zTj X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2026 13:28:43.3920 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: da4752c4-fa6e-4128-e36d-08de73a8a195 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B071.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB5882 Jakub Kicinski writes: > bkg() failures are currently quite hard to debug and spot. > Often we have code along the lines of: > > with bkg("./cmd_rx_something -p PORT"): > wait_port_listen(PORT) > cmd("./cmd_tx_something", host=remote) > > When wait_port_listen() fails we don't get to see the exit status > of bkg(). Even tho very often it's a failure in the bkg() command > that's actually to blame. Try not to interfere with the bkg() > command error checking. > > With: > > with bkg("false", exit_wait=True): > time.sleep(0.01) # let the 'false' cmd run > raise Exception("bla") > > Before: > > .. stack trace .. > # Exception| Exception: bla > > After: > > .. stack trace .. > # Exception| Exception: bla > # Exception| > # Exception| During handling of the above exception, another exception occurred: > .. stack trace .. > # Exception| lib.py.utils.CmdExitFailure: Command failed: false > # Exception| STDOUT: b'' > # Exception| STDERR: b'' > > Signed-off-by: Jakub Kicinski Reviewed-by: Petr Machata