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Date: Fri, 4 Mar 2022 18:55:08 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Linux-Next Mailing List <linux-next@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
lkft-triage@...ts.linaro.org, rcu@...r.kernel.org
Cc: "Paul E. McKenney" <paulmck@...nel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>
Subject: [next] WARNING: suspicious RCU usage : include/linux/cgroup.h:494
suspicious rcu_dereference_check() usage
While booting x86_64 with linux next-20220304 kernel the following kernel
warning reported [1].
metadata:
git_ref: master
git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
git_sha: 6d284ba80c0c485bcaa7bdf67f232d572640edc4
git_describe: next-20220304
kernel-config: https://builds.tuxbuild.com/25uuYdm2vTO275aZ3IewZY5sKbU/config
warning log:
---------
[ 1.482171] MDS: Mitigation: Clear CPU buffers
[ 1.485680] Freeing SMP alternatives memory: 52K
[ 1.487341]
[ 1.488169] =============================
[ 1.488169] WARNING: suspicious RCU usage
[ 1.488169] 5.17.0-rc6-next-20220304 #1 Not tainted
[ 1.488169] -----------------------------
[ 1.488169] include/linux/cgroup.h:494 suspicious
rcu_dereference_check() usage!
[ 1.488169]
[ 1.488169] other info that might help us debug this:
[ 1.488169]
[ 1.488169]
[ 1.488169] rcu_scheduler_active = 1, debug_locks = 1
[ 1.488169] 2 locks held by kthreadd/2:
[ 1.488169] #0: ffff9ba440352330 (&p->pi_lock){....}-{2:2}, at:
task_rq_lock+0x2e/0x130
[ 1.488169] #1: ffff9ba7a7a2d058 (&rq->__lock){-...}-{2:2}, at:
task_rq_lock+0x5d/0x130
[ 1.488169]
[ 1.488169] stack backtrace:
[ 1.488169] CPU: 0 PID: 2 Comm: kthreadd Not tainted
5.17.0-rc6-next-20220304 #1
[ 1.488169] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.5 11/26/2020
[ 1.488169] Call Trace:
[ 1.488169] <TASK>
[ 1.488169] dump_stack_lvl+0x49/0x5e
[ 1.488169] dump_stack+0x10/0x12
[ 1.488169] lockdep_rcu_suspicious+0xed/0xf8
[ 1.488169] cpuacct_charge+0x10c/0x120
[ 1.488169] update_curr+0x165/0x340
[ 1.488169] dequeue_entity+0x23/0x430
[ 1.488169] dequeue_task_fair+0xba/0x3b0
[ 1.488169] __do_set_cpus_allowed+0xca/0x2c0
[ 1.488169] __set_cpus_allowed_ptr_locked+0x128/0x1b0
[ 1.488169] set_cpus_allowed_ptr+0x43/0x70
[ 1.488169] kthreadd+0x49/0x230
[ 1.488169] ? kthread_is_per_cpu+0x30/0x30
[ 1.488169] ret_from_fork+0x22/0x30
[ 1.488169] </TASK>
[ 1.488169]
[ 1.488169] =============================
[ 1.488169] WARNING: suspicious RCU usage
[ 1.488169] 5.17.0-rc6-next-20220304 #1 Not tainted
[ 1.488169] -----------------------------
[ 1.488169] include/linux/cgroup.h:481 suspicious
rcu_dereference_check() usage!
[ 1.488169]
[ 1.488169] other info that might help us debug this:
[ 1.488169]
[ 1.488169]
[ 1.488169] rcu_scheduler_active = 1, debug_locks = 1
[ 1.488169] 2 locks held by kthreadd/2:
[ 1.488169] #0: ffff9ba440352330 (&p->pi_lock){....}-{2:2}, at:
task_rq_lock+0x2e/0x130
[ 1.488169] #1: ffff9ba7a7a2d058 (&rq->__lock){-...}-{2:2}, at:
task_rq_lock+0x5d/0x130
[ 1.488169]
[ 1.488169] stack backtrace:
[ 1.488169] CPU: 0 PID: 2 Comm: kthreadd Not tainted
5.17.0-rc6-next-20220304 #1
[ 1.488169] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.5 11/26/2020
[ 1.488169] Call Trace:
[ 1.488169] <TASK>
[ 1.488169] dump_stack_lvl+0x49/0x5e
[ 1.488169] dump_stack+0x10/0x12
[ 1.488169] lockdep_rcu_suspicious+0xed/0xf8
[ 1.488169] update_curr+0x2b7/0x340
[ 1.488169] dequeue_entity+0x23/0x430
[ 1.488169] dequeue_task_fair+0xba/0x3b0
[ 1.488169] __do_set_cpus_allowed+0xca/0x2c0
[ 1.488169] __set_cpus_allowed_ptr_locked+0x128/0x1b0
[ 1.488169] set_cpus_allowed_ptr+0x43/0x70
[ 1.488169] kthreadd+0x49/0x230
[ 1.488169] ? kthread_is_per_cpu+0x30/0x30
[ 1.488169] ret_from_fork+0x22/0x30
[ 1.488169] </TASK>
[ 1.488169]
[ 1.488169] =============================
[ 1.488169] WARNING: suspicious RCU usage
[ 1.488169] 5.17.0-rc6-next-20220304 #1 Not tainted
[ 1.488169] -----------------------------
[ 1.488169] include/linux/cgroup.h:481 suspicious
rcu_dereference_check() usage!
[ 1.488169]
[ 1.488169] other info that might help us debug this:
[ 1.488169]
[ 1.488169]
[ 1.488169] rcu_scheduler_active = 1, debug_locks = 1
[ 1.488169] no locks held by kthreadd/2.
[ 1.488169]
[ 1.488169] stack backtrace:
[ 1.488169] CPU: 0 PID: 2 Comm: kthreadd Not tainted
5.17.0-rc6-next-20220304 #1
[ 1.488169] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.5 11/26/2020
[ 1.488169] Call Trace:
[ 1.488169] <IRQ>
[ 1.488169] dump_stack_lvl+0x49/0x5e
[ 1.488169] dump_stack+0x10/0x12
[ 1.488169] lockdep_rcu_suspicious+0xed/0xf8
[ 1.488169] account_system_index_time+0x127/0x130
[ 1.488169] account_system_time+0x50/0x60
[ 1.488169] account_process_tick+0x59/0x80
[ 1.488169] update_process_times+0x58/0xe0
[ 1.488169] tick_periodic+0x37/0xf0
[ 1.488169] tick_handle_periodic+0x24/0x70
[ 1.488169] timer_interrupt+0x18/0x20
[ 1.488169] __handle_irq_event_percpu+0x95/0x2f0
[ 1.488169] handle_irq_event+0x39/0x80
[ 1.488169] handle_edge_irq+0xa4/0x240
[ 1.488169] __common_interrupt+0x8d/0x170
[ 1.488169] common_interrupt+0xbd/0xe0
[ 1.488169] </IRQ>
[ 1.488169] <TASK>
[ 1.488169] asm_common_interrupt+0x1e/0x40
[ 1.488169] RIP: 0010:_raw_spin_unlock_irqrestore+0x37/0x60
[ 1.488169] Code: fc 48 83 c7 18 53 48 89 f3 48 8b 75 08 e8 21 83
ed fe 4c 89 e7 e8 19 b0 ed fe 80 e7 02 74 06 e8 6f 77 fa fe fb bf 01
00 00 00 <e8> 24 6b e9 fe 65 8b 05 bd e1 28 66 85 c0 74 05 5b 41 5c 5d
c3 0f
[ 1.488169] RSP: 0000:ffffb75b0002fd50 EFLAGS: 00000202
[ 1.488169] RAX: 0000000000000007 RBX: 0000000000000246 RCX: 0000000000000000
[ 1.488169] RDX: 0000000000000000 RSI: ffffffff9a800a7c RDI: 0000000000000001
[ 1.488169] RBP: ffffb75b0002fd60 R08: 0000000000000001 R09: 0000000000000001
[ 1.488169] R10: 0000000000000002 R11: 0000000000000001 R12: ffff9ba440352318
[ 1.488169] R13: 0000000000000000 R14: 0000000000000000 R15: ffff9ba7a7a2d040
[ 1.488169] affine_move_task+0x2d4/0x5d0
[ 1.488169] ? __this_cpu_preempt_check+0x13/0x20
[ 1.488169] ? lock_is_held_type+0xdd/0x130
[ 1.488169] ? enqueue_entity+0x1b8/0x520
[ 1.488169] __set_cpus_allowed_ptr_locked+0x15c/0x1b0
[ 1.488169] set_cpus_allowed_ptr+0x43/0x70
[ 1.488169] kthreadd+0x49/0x230
[ 1.488169] ? kthread_is_per_cpu+0x30/0x30
[ 1.488169] ret_from_fork+0x22/0x30
[ 1.488169] </TASK>
[ 1.489211] smpboot: Estimated ratio of average max frequency by
base frequency (times 1024): 1126
[ 1.490189] smpboot: CPU0: Intel(R) Xeon(R) CPU E3-1220 v6 @
3.00GHz (family: 0x6, model: 0x9e, stepping: 0x9)
[ 1.491635] cblist_init_generic: Setting adjustable number of
callback queues.
[ 1.492171] cblist_init_generic: Setting shift to 2 and lim to 1.
[ 1.493226] cblist_init_generic: Setting shift to 2 and lim to 1.
[ 1.494226] cblist_init_generic: Setting shift to 2 and lim to 1.
[ 1.495219] Running RCU-tasks wait API self tests
[ 1.598317] Performance Events: PEBS fmt3+, Skylake events, 32-deep
LBR, full-width counters, Intel PMU driver.
[ 1.599176] ... version: 4
[ 1.600171] ... bit width: 48
[ 1.601171] ... generic registers: 8
[ 1.602171] ... value mask: 0000ffffffffffff
[ 1.603171] ... max period: 00007fffffffffff
[ 1.604176] ... fixed-purpose events: 3
[ 1.605171] ... event mask: 00000007000000ff
[ 1.606188] Callback from call_rcu_tasks_trace() invoked.
[ 1.607450] rcu: Hierarchical SRCU implementation.
[ 1.608310]
[ 1.609169] =============================
[ 1.609169] WARNING: suspicious RCU usage
[ 1.609169] 5.17.0-rc6-next-20220304 #1 Not tainted
[ 1.609169] -----------------------------
[ 1.609169] include/linux/cgroup.h:481 suspicious
rcu_dereference_check() usage!
[ 1.609169]
[ 1.609169] other info that might help us debug this:
[ 1.609169]
[ 1.609169]
[ 1.609169] rcu_scheduler_active = 1, debug_locks = 1
[ 1.609169] 1 lock held by migration/0/17:
[ 1.609169] #0: ffff9ba7a7a2d058 (&rq->__lock){-.-.}-{2:2}, at:
__schedule+0x12d/0xcb0
[ 1.609169]
[ 1.609169] stack backtrace:
[ 1.609169] CPU: 0 PID: 17 Comm: migration/0 Not tainted
5.17.0-rc6-next-20220304 #1
[ 1.609169] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.5 11/26/2020
[ 1.609169] Stopper: 0x0 <- 0x0
[ 1.609169] Call Trace:
[ 1.609169] <TASK>
[ 1.609169] dump_stack_lvl+0x49/0x5e
[ 1.609169] dump_stack+0x10/0x12
[ 1.609169] lockdep_rcu_suspicious+0xed/0xf8
[ 1.609169] put_prev_task_stop+0x1dc/0x240
[ 1.609169] __schedule+0x751/0xcb0
[ 1.609169] ? trace_preempt_off+0x29/0xc0
[ 1.609169] ? smpboot_thread_fn+0x33/0x290
[ 1.609169] schedule+0x58/0xc0
[ 1.609169] smpboot_thread_fn+0xec/0x290
[ 1.609169] ? sort_range+0x30/0x30
[ 1.609169] kthread+0x107/0x130
[ 1.609169] ? kthread_complete_and_exit+0x20/0x20
[ 1.609169] ret_from_fork+0x22/0x30
[ 1.609169] </TASK>
[ 1.610276] smp: Bringing up secondary CPUs ...
[ 1.611596] x86: Booting SMP configuration:
[ 1.612179] .... node #0, CPUs: #1 #2 #3
[ 1.614396] smp: Brought up 1 node, 4 CPUs
Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
--
Linaro LKFT
https://lkft.linaro.org
[1] https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20220304/testrun/8235955/suite/linux-log-parser/test/check-kernel-warning-4655400/log
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