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Message-ID: <202508261642.b15eefbb-lkp@intel.com>
Date: Tue, 26 Aug 2025 16:47:22 +0800
From: kernel test robot <oliver.sang@...el.com>
To: "Paul E. McKenney" <paulmck@...nel.org>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Andrii Nakryiko
<andrii@...nel.org>, Alexei Starovoitov <ast@...nel.org>, Peter Zijlstra
<peterz@...radead.org>, <rcu@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <oliver.sang@...el.com>
Subject: [paulmckrcu:dev.2025.08.21a] [rcu] 8bd9383727:
WARNING:possible_circular_locking_dependency_detected
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 <oliver.sang@...el.com>
| 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] <TASK>
[ 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] </TASK>
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
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