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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?9kIcvjhR4yXK7JQOsIO2ocdfvjRXSh6w9K+bN3e50vFgpXbAS4PQoCzqfzuZ?= =?us-ascii?Q?a6p+I54ahaJkhVF2r9B0NO8ecmev9C/iPZmaIMB5mC/lEDJhOrqUWh0bpld8?= =?us-ascii?Q?zCypsebGr/wFsacGkHNC2Y4ct1z62+oFA24t1j9JorNF2Fxopv0EcAsk7Y0q?= =?us-ascii?Q?9KiQYdwVMZzkft2Bb4C8q59de7AUK+vSShcr82NNHzyDHEUZomSxFqaruKhB?= =?us-ascii?Q?ilI0ABC8dDkADbg7FI5q8JCdvsOe5V6RvH3usOUP3S7ohsiMurqlHFS3tf3i?= =?us-ascii?Q?x323n2JKAPTsElQneoOKEoekc2pUTouqeuVWVEWeFkC2ZK5L5He2/s04eqOf?= =?us-ascii?Q?Nm2lmKfPy7h4q3Qg23BK4UUF0o5wRaD5HprbVYN/f/Z7qJC1+fMrQocUm8EY?= =?us-ascii?Q?uT1+CHMjY1UaTXs/bv4hWaciJyLELBNRXy629MS5z3a+o27VjQjiJX7BJaDI?= =?us-ascii?Q?qyRc2E5DLArBvcxbLvk6eh9QXrxQP0nJ4+I8xki1rHZBJimsQ+J0DddRc8W7?= =?us-ascii?Q?xSLHRVmSmqd+xVrRjMOp0X+EnKc77fP3UXOw7appPoJackKXWXK498/gy3qZ?= =?us-ascii?Q?VXszRm6/xTRiA+78gjdjH2W884lGNcPWwKsGNn60BKRkJ9QayaCAnstacqgL?= =?us-ascii?Q?qucIEhQ1UM/hVhZ2otnLv2q6IAW8ptjPiYiCUUHuUlgS/Nf4oYuvXwsGZWcR?= =?us-ascii?Q?kMtykils1wQjjA83seQPKJcpiu/7B1YKx+oaCKgc3uX6gIHoTHqTnGFnuAjL?= =?us-ascii?Q?rfhRtmnQyxVhafWgUQ7IFeZJoNE2moZMw5RDi8B/RHOTiuBIjHs5qM0vV48/?= =?us-ascii?Q?vyquYmmSxuZtI4wYbLIiYc8m9hWEKmlHMRolXOtM7f3F2gELqkHVQp5CyqHj?= =?us-ascii?Q?I+/uVhnWOncShr0fAlAvoUDcK+1+c3D49k9C6oQ8nUJNZUkkWBa8xJ21NRJV?= =?us-ascii?Q?bp15Hc3HjW4BAtqFZXARcg2iIqLF9fDi1VWGbV/s/NTTydbw4NvpAUM+hWxB?= =?us-ascii?Q?DU8yU0H2MWnCKCszFVYIcQsdl/xZfDkTKds+xTf5X/c3cNSqlg/4+zDrEJXP?= =?us-ascii?Q?r5USh052Jo8JNlk/PwOYP/so8HowcVFzR9zJPKJ+TQ3kAuXIF+bLm7BQMb/G?= =?us-ascii?Q?3BfzXmoUQhuA8WcIcNYkiZa1TZzrLUyOCTPjDl8kquZxINYH4Y+O8m71Bjl+?= =?us-ascii?Q?bk2YEDzpo2vlu8dkqzMhr91CkE9tSzSlvM5PQ9QLrzoD/qs9j+cxShBpikpG?= =?us-ascii?Q?0R50OK5B8LLiDfjPrDisLejRhgfb+1TJt6niiMjmdqMPPec7u/wwl18xpWS1?= =?us-ascii?Q?NvnsDwatJJXcoOC/dLFzURK3eRIxova606ijqmAaYP+QIxh4KvLnqTKFJe2X?= =?us-ascii?Q?rBFXxSGdIIkdBr1IAQwwIoNDkMX2zzuyUExym9pPZph42F/rKoBitddmgEu9?= =?us-ascii?Q?BHK/bNYd+e9hL72y5a1wnlLTFZ1NVxP0oZDwPZBm4sh5Xx3fVCALYzVltcn8?= =?us-ascii?Q?PkDrUJ+9KqC0w9udTaBIIBCT7TvZqB85lyiKZsoyClMVTi1oW5wvYZZ/JAtE?= =?us-ascii?Q?jQ416wzqqumKgitefA46hIf1GsQoj8pSXwgu74mQ9mI6fOCvxXRh0QFt5iPZ?= =?us-ascii?Q?uQ=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 2d831cb1-10c0-4496-ef44-08dde47d321d X-MS-Exchange-CrossTenant-AuthSource: LV3PR11MB8603.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Aug 2025 08:47:32.0363 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Eyf4vNJYj630boyqc8pOzwzg6it5T2nbOgMcJuCujkhPxvbnUnFa1VbQrMcl1SL4xlb5MYhPmerX1BYD79kgJw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB7758 X-OriginatorOrg: intel.com hi, Paul, the similar issue still exists on this dev.2025.08.21a branch. again, if the issue is already fixed on later branches, please just ignore. thanks Hello, kernel test robot noticed "WARNING:possible_circular_locking_dependency_detected" on: commit: 8bd9383727068a5a18acfecefbdfa44a7d6bd838 ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast") https://github.com/paulmckrcu/linux dev.2025.08.21a in testcase: rcutorture version: with following parameters: runtime: 300s test: default torture_type: tasks-tracing config: x86_64-randconfig-003-20250824 compiler: clang-20 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202508261642.b15eefbb-lkp@intel.com [ 42.365933][ T393] WARNING: possible circular locking dependency detected [ 42.366428][ T393] 6.17.0-rc1-00035-g8bd938372706 #1 Tainted: G T [ 42.366985][ T393] ------------------------------------------------------ [ 42.367490][ T393] rcu_torture_rea/393 is trying to acquire lock: [ 42.367952][ T393] ffffffffad41dc88 (rcu_tasks_trace_srcu_struct.srcu_wq.lock){....}-{2:2}, at: swake_up_one (kernel/sched/swait.c:52 (discriminator 1)) [ 42.368775][ T393] [ 42.368775][ T393] but task is already holding lock: [ 42.369278][ T393] ffff88813d1ff2e8 (&p->pi_lock){-.-.}-{2:2}, at: rcutorture_one_extend (kernel/rcu/rcutorture.c:?) rcutorture [ 42.370043][ T393] [ 42.370043][ T393] which lock already depends on the new lock. [ 42.370043][ T393] [ 42.370755][ T393] [ 42.370755][ T393] the existing dependency chain (in reverse order) is: [ 42.371388][ T393] [ 42.371388][ T393] -> #1 (&p->pi_lock){-.-.}-{2:2}: [ 42.371903][ T393] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:110 kernel/locking/spinlock.c:162) [ 42.372309][ T393] try_to_wake_up (include/linux/spinlock.h:557 (discriminator 1) kernel/sched/core.c:4216 (discriminator 1)) [ 42.372669][ T393] swake_up_locked (include/linux/list.h:111) [ 42.373029][ T393] swake_up_one (kernel/sched/swait.c:54 (discriminator 1)) [ 42.373380][ T393] tasks_tracing_torture_read_unlock (include/linux/srcu.h:408 (discriminator 1) include/linux/rcupdate_trace.h:81 (discriminator 1) kernel/rcu/rcutorture.c:1112 (discriminator 1)) rcutorture [ 42.373952][ T393] rcutorture_one_extend (kernel/rcu/rcutorture.c:2141) rcutorture [ 42.374452][ T393] rcu_torture_one_read_end (kernel/rcu/rcutorture.c:2357) rcutorture [ 42.374976][ T393] rcu_torture_one_read (kernel/rcu/rcutorture.c:?) rcutorture [ 42.375460][ T393] rcu_torture_reader (kernel/rcu/rcutorture.c:2443) rcutorture [ 42.375920][ T393] kthread (kernel/kthread.c:465) [ 42.376241][ T393] ret_from_fork (arch/x86/kernel/process.c:154) [ 42.376603][ T393] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) [ 42.376973][ T393] [ 42.376973][ T393] -> #0 (rcu_tasks_trace_srcu_struct.srcu_wq.lock){....}-{2:2}: [ 42.377657][ T393] __lock_acquire (kernel/locking/lockdep.c:3166) [ 42.378031][ T393] lock_acquire (kernel/locking/lockdep.c:5868) [ 42.378378][ T393] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:110 kernel/locking/spinlock.c:162) [ 42.378794][ T393] swake_up_one (kernel/sched/swait.c:52 (discriminator 1)) [ 42.379152][ T393] tasks_tracing_torture_read_unlock (include/linux/srcu.h:408 (discriminator 1) include/linux/rcupdate_trace.h:81 (discriminator 1) kernel/rcu/rcutorture.c:1112 (discriminator 1)) rcutorture [ 42.379714][ T393] rcutorture_one_extend (kernel/rcu/rcutorture.c:2141) rcutorture [ 42.380217][ T393] rcu_torture_one_read_end (kernel/rcu/rcutorture.c:2357) rcutorture [ 42.380731][ T393] rcu_torture_one_read (kernel/rcu/rcutorture.c:?) rcutorture [ 42.381220][ T393] rcu_torture_reader (kernel/rcu/rcutorture.c:2443) rcutorture [ 42.381714][ T393] kthread (kernel/kthread.c:465) [ 42.382060][ T393] ret_from_fork (arch/x86/kernel/process.c:154) [ 42.382420][ T393] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) [ 42.382796][ T393] [ 42.382796][ T393] other info that might help us debug this: [ 42.382796][ T393] [ 42.383515][ T393] Possible unsafe locking scenario: [ 42.383515][ T393] [ 42.384052][ T393] CPU0 CPU1 [ 42.384428][ T393] ---- ---- [ 42.384799][ T393] lock(&p->pi_lock); [ 42.385083][ T393] lock(rcu_tasks_trace_srcu_struct.srcu_wq.lock); [ 42.385707][ T393] lock(&p->pi_lock); [ 42.386180][ T393] lock(rcu_tasks_trace_srcu_struct.srcu_wq.lock); [ 42.386663][ T393] [ 42.386663][ T393] *** DEADLOCK *** [ 42.386663][ T393] [ 42.387236][ T393] 1 lock held by rcu_torture_rea/393: [ 42.387626][ T393] #0: ffff88813d1ff2e8 (&p->pi_lock){-.-.}-{2:2}, at: rcutorture_one_extend (kernel/rcu/rcutorture.c:?) rcutorture [ 42.388419][ T393] [ 42.388419][ T393] stack backtrace: [ 42.388852][ T393] CPU: 0 UID: 0 PID: 393 Comm: rcu_torture_rea Tainted: G T 6.17.0-rc1-00035-g8bd938372706 #1 PREEMPT(full) [ 42.389758][ T393] Tainted: [T]=RANDSTRUCT [ 42.390057][ T393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 42.390786][ T393] Call Trace: [ 42.391020][ T393] [ 42.391225][ T393] dump_stack_lvl (lib/dump_stack.c:123 (discriminator 2)) [ 42.391544][ T393] print_circular_bug (kernel/locking/lockdep.c:2045) [ 42.391898][ T393] check_noncircular (kernel/locking/lockdep.c:?) [ 42.392242][ T393] __lock_acquire (kernel/locking/lockdep.c:3166) [ 42.392594][ T393] ? __schedule (kernel/sched/sched.h:1531 (discriminator 1) kernel/sched/core.c:6969 (discriminator 1)) [ 42.392930][ T393] ? lock_release (kernel/locking/lockdep.c:470 (discriminator 3)) [ 42.393272][ T393] ? swake_up_one (kernel/sched/swait.c:52 (discriminator 1)) [ 42.393610][ T393] lock_acquire (kernel/locking/lockdep.c:5868) [ 42.393930][ T393] ? swake_up_one (kernel/sched/swait.c:52 (discriminator 1)) [ 42.394264][ T393] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:110 kernel/locking/spinlock.c:162) [ 42.394640][ T393] ? swake_up_one (kernel/sched/swait.c:52 (discriminator 1)) [ 42.394969][ T393] swake_up_one (kernel/sched/swait.c:52 (discriminator 1)) [ 42.395281][ T393] tasks_tracing_torture_read_unlock (include/linux/srcu.h:408 (discriminator 1) include/linux/rcupdate_trace.h:81 (discriminator 1) kernel/rcu/rcutorture.c:1112 (discriminator 1)) rcutorture [ 42.395814][ T393] rcutorture_one_extend (kernel/rcu/rcutorture.c:2141) rcutorture [ 42.396276][ T393] rcu_torture_one_read_end (kernel/rcu/rcutorture.c:2357) rcutorture [ 42.396756][ T393] rcu_torture_one_read (kernel/rcu/rcutorture.c:?) rcutorture [ 42.397219][ T393] ? __cfi_rcu_torture_reader (kernel/rcu/rcutorture.c:2426) rcutorture [ 42.397690][ T393] rcu_torture_reader (kernel/rcu/rcutorture.c:2443) rcutorture [ 42.398126][ T393] ? __cfi_rcu_torture_timer (kernel/rcu/rcutorture.c:2405) rcutorture [ 42.398565][ T393] kthread (kernel/kthread.c:465) [ 42.398857][ T393] ? __cfi_kthread (kernel/kthread.c:412) [ 42.399169][ T393] ret_from_fork (arch/x86/kernel/process.c:154) [ 42.399491][ T393] ? __cfi_kthread (kernel/kthread.c:412) [ 42.399815][ T393] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) [ 42.400151][ T393] The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250826/202508261642.b15eefbb-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki