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[23.128.96.19]) by mx.google.com with ESMTPS id h9-20020a170902f54900b0014f73fa2b12si5968166plf.525.2022.03.04.12.56.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Mar 2022 12:56:30 -0800 (PST) Received-SPF: softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) client-ip=23.128.96.19; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=FESTVEuN; spf=softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id EB62D24314C; Fri, 4 Mar 2022 11:55:08 -0800 (PST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229496AbiCDTzD (ORCPT + 99 others); Fri, 4 Mar 2022 14:55:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50342 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229459AbiCDTyx (ORCPT ); Fri, 4 Mar 2022 14:54:53 -0500 Received: from mail-lf1-f51.google.com (mail-lf1-f51.google.com [209.85.167.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59D41204FC2; Fri, 4 Mar 2022 11:50:16 -0800 (PST) Received: by mail-lf1-f51.google.com with SMTP id f37so15914324lfv.8; Fri, 04 Mar 2022 11:50:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=6TEtjA80li3GwoTXdCbbmIi4gGeHzm++a4iSp6bbz+E=; b=FESTVEuNGelu7Lws+Gyo7sgSeqqjh6ymS8+wMHlIqqHv84QCj6oDx7HlwReD/Z7E62 4XXwN20831ENBPalhKhoF6UYQu6ORzT9qs9eS455qG7+lLLIiDWkeVL6TwSQx6vUus3G LMPFMN8rWICp2n7SkutoQXzO1OIVHEXQijQPasKqQlGl54B3ZZTqdEGSfdtT/l98IC3T sH5uaoqXQrzC6olZVuavKLPnXPlxnOtTFDHloO6EXB9oGMnZnnVIOja+/iRa5MhcHRKP rDUE6DX0oojMnXKHgFfhd/IBnOL1ZflzQa7FRozbAWF2MnbfUCrAHyPr3SctR/pE+Awb yrrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=6TEtjA80li3GwoTXdCbbmIi4gGeHzm++a4iSp6bbz+E=; b=qsPFsNL8Y4OcnwFZ2ugJohd7Q6pPDg3kiNruJoZ7jJHuY6ITvLydg7z7iHr75uYMYG TnoqnO8OMgi4mvgNlfkEmWnpO7iaoc9b8rTElImUxmx8K3lmRyCua61pwDhGncsSUyYR XlWEHbEAEb/nNBCR/QN0O8LO41lvHPKOaY9onKo2TSMsImRYN3DnQiRfNAiX6pkUUiGH xxp/WOuRY8W9yd2Fi9yiG3zICiA+WXi8OYTdkWhVz3rFyAfk/nLj9GnGeaMNOU5W5hNP JSjT35RrXvhtG60238ebxU4xDmu1y2EGty2PqFkf8PvmN+sXQ3rhfUIYefLv9rE5M4ZF vuAQ== X-Gm-Message-State: AOAM533cMjcjgvEWgXBvGOws332dfo3MNSF40/YKmHyptYIzLZduZ6zF 3HsB8QWtHDZdOjDXlW2V+IaLvytx8tn+05MmhHpJPn/RmVQ= X-Received: by 2002:a17:907:1c0c:b0:6da:7d3c:ba07 with SMTP id nc12-20020a1709071c0c00b006da7d3cba07mr286475ejc.486.1646422724829; Fri, 04 Mar 2022 11:38:44 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Zhouyi Zhou Date: Sat, 5 Mar 2022 03:38:33 +0800 Message-ID: Subject: Re: [next] WARNING: suspicious RCU usage : include/linux/cgroup.h:494 suspicious rcu_dereference_check() usage To: Naresh Kamboju , zhouchengming@bytedance.com Cc: Linux-Next Mailing List , open list , lkft-triage@lists.linaro.org, rcu , "Paul E. McKenney" , Stephen Rothwell , Peter Zijlstra , Ingo Molnar , Will Deacon Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RDNS_NONE, SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I can reproduce these warnings on my X86 VM. Following the my backtrace: (gdb) bt #0 lockdep_rcu_suspicious (file=file@entry=0xffffffff825ea8ff "include/linux/cgroup.h", line=line@entry=494, s=s@entry=0xffffffff825c5c50 "suspicious rcu_dereference_check() usage") at ./arch/x86/include/asm/current.h:15 #1 0xffffffff81183103 in task_css (subsys_id=2, task=0xffff888100804080) at ./include/linux/cgroup.h:494 #2 task_ca (tsk=0xffff888100804080) at kernel/sched/cpuacct.c:40 #3 cpuacct_charge (tsk=tsk@entry=0xffff888100804080, cputime=cputime@entry=3344803) at kernel/sched/cpuacct.c:342 #4 0xffffffff81162655 in cgroup_account_cputime (delta_exec=3344803, task=0xffff888100804080) at ./include/linux/cgroup.h:792 #5 update_curr (cfs_rq=cfs_rq@entry=0xffff88813b63f500) at kernel/sched/fair.c:907 #6 0xffffffff81164797 in dequeue_entity (flags=10, se=0xffff888100804100, cfs_rq=0xffff88813b63f500) at kernel/sched/fair.c:5771 #7 dequeue_task_fair (rq=0xffff88813b63f440, p=0xffff888100804080, flags=10) at kernel/sched/fair.c:5771 #8 0xffffffff8115412a in dequeue_task (flags=10, p=0xffff888100804080, rq=0xffff88813b63f440) at kernel/sched/core.c:2019 #9 __do_set_cpus_allowed (p=0xffff888100804080, new_mask=0xffffffff831b4d40 , flags=0) at kernel/sched/core.c:2508 #10 0xffffffff811564ca in __set_cpus_allowed_ptr_locked (p=p@entry=0xffff888100804080, new_mask=new_mask@entry=0xffffffff831b4d40 , flags=flags@entry=0, rq=0xffff88813b63f440, rf=rf@entry=0xffffc9000012bee8) at kernel/sched/core.c:2841 #11 0xffffffff81156573 in __set_cpus_allowed_ptr (p=p@entry=0xffff888100804080, new_mask=0xffffffff831b4d40 , flags=flags@entry=0) at kernel/sched/core.c:2874 #12 0xffffffff8115664c in set_cpus_allowed_ptr (p=p@entry=0xffff888100804080, new_mask=) at kernel/sched/core.c:2879 #13 0xffffffff81144676 in kthreadd (unused=) at kernel/kthread.c:724 #14 0xffffffff810019df in ret_from_fork () at arch/x86/entry/entry_64.S:295 #15 0x0000000000000000 in ?? () Do the warnings have something to do with commit dc6e0818bc9a0336d9accf3ea35d146d72aa7a18 (sched/cpuacct: Optimize away RCU read lock) ? Many thanks Zhouyi On Fri, Mar 4, 2022 at 10:43 PM Naresh Kamboju wrote: > > 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] > [ 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] > [ 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] > [ 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] > [ 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] > [ 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] > [ 1.488169] > [ 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 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] > [ 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] > [ 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] > [ 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 > > -- > 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