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Sun, 29 Jan 2023 23:44:54 +0000 Received: from DM5PR10MB1466.namprd10.prod.outlook.com ([fe80::c888:aca:1eb9:ca4f]) by DM5PR10MB1466.namprd10.prod.outlook.com ([fe80::c888:aca:1eb9:ca4f%5]) with mapi id 15.20.6064.017; Sun, 29 Jan 2023 23:44:54 +0000 From: Mike Christie To: mlombard@redhat.com, martin.petersen@oracle.com, mgurtovoy@nvidia.com, sagi@grimberg.me, d.bogdanov@yadro.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Cc: Mike Christie Subject: [PATCH v3 07/14] scsi: target: Fix multiple LUN_RESET handling Date: Sun, 29 Jan 2023 17:44:34 -0600 Message-Id: <20230129234441.116310-8-michael.christie@oracle.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230129234441.116310-1-michael.christie@oracle.com> References: <20230129234441.116310-1-michael.christie@oracle.com> X-ClientProxiedBy: DM6PR02CA0168.namprd02.prod.outlook.com (2603:10b6:5:332::35) To DM5PR10MB1466.namprd10.prod.outlook.com (2603:10b6:3:b::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM5PR10MB1466:EE_|SA2PR10MB4649:EE_ X-MS-Office365-Filtering-Correlation-Id: bc478893-a1a6-4a63-044c-08db0252d291 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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The bug was added in: commit 51ec502a3266 ("target: Delete tmr from list before processing") The problem occurs when: 1. We have N IO cmds running in the target layer spread over 2 sessions. 2. The initiator sends a LUN_RESET for each session. 3. session1's LUN_RESET loops over all the running commands from both sessions and moves them to its local drain_task_list. 4. session2's LUN_RESET does not see the LUN_RESET from session1 because the commit above has it remove itself. session2 also does not see any commands since the other reset moved them off the state lists. 5. sessions2's LUN_RESET will then complete with a successful response. 6. sessions2's inititor believes the running commands on its session are now cleaned up due to the successful response and cleans up the running commands from its side. It then restarts them. 7. The commands do eventually complete on the backend and the target starts to return aborted task statuses for them. The initiator will either throw a invalid ITT error or might accidentally lookup a new task if the ITT has been reallocated already. This fixes the bug by reverting the patch. Fixes: 51ec502a3266 ("target: Delete tmr from list before processing") Signed-off-by: Mike Christie Reviewed-by: Dmitry Bogdanov Tested-by: Dmitry Bogdanov --- drivers/target/target_core_tmr.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c index 2b95b4550a63..a60802b4c5a3 100644 --- a/drivers/target/target_core_tmr.c +++ b/drivers/target/target_core_tmr.c @@ -188,9 +188,10 @@ static void core_tmr_drain_tmr_list( * LUN_RESET tmr.. */ spin_lock_irqsave(&dev->se_tmr_lock, flags); - if (tmr) - list_del_init(&tmr->tmr_list); list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { + if (tmr_p == tmr) + continue; + cmd = tmr_p->task_cmd; if (!cmd) { pr_err("Unable to locate struct se_cmd for TMR\n");