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From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Mon, 31 Aug 2020 12:02:31 +0530
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Subject: WARNING: suspicious RCU usage - sdhci-pltfm: SDHCI platform and OF
 driver helper
To:     open list <linux-kernel@vger.kernel.org>,
        linux-mmc <linux-mmc@vger.kernel.org>,
        lkft-triage@lists.linaro.org, rcu@vger.kernel.org,
        Linux PM <linux-pm@vger.kernel.org>
Cc:     Anders Roxell <anders.roxell@linaro.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Rajendra Nayak <rnayak@codeaurora.org>,
        John Stultz <john.stultz@linaro.org>,
        Stephen Boyd <sboyd@kernel.org>,
        Lars Povlsen <lars.povlsen@microchip.com>,
        madhuparnabhowmik10@gmail.com,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Vincent Guittot <vincent.guittot@linaro.org>
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While booting linux mainline kernel on arm64 db410c this kernel warning
noticed.

metadata:
  git branch: master
  git repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
  git commit: f75aef392f869018f78cfedf3c320a6b3fcfda6b
  git describe: v5.9-rc3
  make_kernelversion: 5.9.0-rc3
  kernel-config:
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/dragonboard-410c/lkft/linux-mainline/2965/config

Boot log,

[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd030]
[    0.000000] Linux version 5.9.0-rc3 (oe-user@oe-host)
(aarch64-linaro-linux-gcc (GCC) 7.3.0, GNU ld (GNU Binutils)
2.30.0.20180208) #1 SMP PREEMPT Mon Aug 31 00:23:15 UTC 2020
[    0.000000] Machine model: Qualcomm Technologies, Inc. APQ 8016 SBC
<>
[    5.299090] sdhci: Secure Digital Host Controller Interface driver
[    5.299140] sdhci: Copyright(c) Pierre Ossman
[    5.304313]
[    5.307771] Synopsys Designware Multimedia Card Interface Driver
[    5.308588] =============================
[    5.308593] WARNING: suspicious RCU usage
[    5.316628] sdhci-pltfm: SDHCI platform and OF driver helper
[    5.320052] 5.9.0-rc3 #1 Not tainted
[    5.320057] -----------------------------
[    5.320063] /usr/src/kernel/include/trace/events/lock.h:37
suspicious rcu_dereference_check() usage!
[    5.320068]
[    5.320068] other info that might help us debug this:
[    5.320068]
[    5.320074]
[    5.320074] rcu_scheduler_active = 2, debug_locks = 1
[    5.320078] RCU used illegally from extended quiescent state!
[    5.320084] no locks held by swapper/0/0.
[    5.320089]
[    5.320089] stack backtrace:
[    5.320098] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc3 #1
[    5.346354] sdhci_msm 7864900.sdhci: Got CD GPIO
[    5.346446] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
[    5.346452] Call trace:
[    5.346463]  dump_backtrace+0x0/0x1f8
[    5.346471]  show_stack+0x2c/0x38
[    5.346480]  dump_stack+0xec/0x15c
[    5.346490]  lockdep_rcu_suspicious+0xd4/0xf8
[    5.346499]  lock_acquire+0x3d0/0x440
[    5.346510]  _raw_spin_lock_irqsave+0x80/0xb0
[    5.413118]  __pm_runtime_suspend+0x34/0x1d0
[    5.417457]  psci_enter_domain_idle_state+0x4c/0xb0
[    5.421795]  cpuidle_enter_state+0xc8/0x610
[    5.426392]  cpuidle_enter+0x3c/0x50
[    5.430561]  call_cpuidle+0x44/0x80
[    5.434378]  do_idle+0x240/0x2a0
[    5.437589]  cpu_startup_entry+0x2c/0x78
[    5.441063]  rest_init+0x1ac/0x280
[    5.444970]  arch_call_rest_init+0x14/0x1c
[    5.448180]  start_kernel+0x50c/0x544
[    5.452395]
[    5.452399]
[    5.452403] =============================
[    5.452406] WARNING: suspicious RCU usage
[    5.452409] 5.9.0-rc3 #1 Not tainted
[    5.452412] -----------------------------
[    5.452417] /usr/src/kernel/include/trace/events/ipi.h:36
suspicious rcu_dereference_check() usage!
[    5.452420]
[    5.452424] other info that might help us debug this:
[    5.452426]
[    5.452429]
[    5.452432] rcu_scheduler_active = 2, debug_locks = 1
[    5.452436] RCU used illegally from extended quiescent state!
[    5.452440] 1 lock held by swapper/0/0:
[    5.452443]  #0: ffff8000127408f8 (logbuf_lock){-...}-{2:2}, at:
vprintk_emit+0xb0/0x358
[    5.452458]
[    5.452461] stack backtrace:
[    5.452465] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc3 #1
[    5.452469] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
[    5.452472] Call trace:
[    5.452476]  dump_backtrace+0x0/0x1f8
[    5.452479]  show_stack+0x2c/0x38
[    5.452481]  dump_stack+0xec/0x15c
[    5.452485]  lockdep_rcu_suspicious+0xd4/0xf8
[    5.452489]  arch_irq_work_raise+0x208/0x210
[    5.452493]  __irq_work_queue_local+0x64/0x88
[    5.452495]  irq_work_queue+0x3c/0x88
[    5.452499]  printk_safe_log_store+0x148/0x178
[    5.452502]  vprintk_func+0x1cc/0x2b8
[    5.452506]  printk+0x74/0x94
[    5.452509]  lockdep_rcu_suspicious+0x28/0xf8
[    5.452512]  lock_release+0x338/0x360
[    5.452516]  _raw_spin_unlock+0x3c/0xa0
[    5.452519]  vprintk_emit+0xf8/0x358
[    5.452522]  vprintk_default+0x48/0x58
[    5.452526]  vprintk_func+0xec/0x2b8
[    5.452528]  printk+0x74/0x94
[    5.452532]  lockdep_rcu_suspicious+0x28/0xf8
[    5.452535]  lock_acquire+0x3d0/0x440
[    5.452538]  _raw_spin_lock_irqsave+0x80/0xb0
[    5.452542]  __pm_runtime_suspend+0x34/0x1d0
[    5.452545]  psci_enter_domain_idle_state+0x4c/0xb0
[    5.452549]  cpuidle_enter_state+0xc8/0x610
[    5.452552]  cpuidle_enter+0x3c/0x50
[    5.452555]  call_cpuidle+0x44/0x80
[    5.452559]  do_idle+0x240/0x2a0
[    5.452562]  cpu_startup_entry+0x2c/0x78
[    5.452564]  rest_init+0x1ac/0x280
[    5.452568]  arch_call_rest_init+0x14/0x1c
[    5.452571]  start_kernel+0x50c/0x544
[    5.452575] =============================
[    5.452578] WARNING: suspicious RCU usage
[    5.452582] 5.9.0-rc3 #1 Not tainted
[    5.452585] -----------------------------
[    5.452590] /usr/src/kernel/include/trace/events/lock.h:63
suspicious rcu_dereference_check() usage!
[    5.452593]
[    5.452596] other info that might help us debug this:
[    5.452599]
[    5.452601]
[    5.452605] rcu_scheduler_active = 2, debug_locks = 1
[    5.452609] RCU used illegally from extended quiescent state!
[    5.452612] 1 lock held by swapper/0/0:
[    5.452615]  #0: ffff8000127408f8 (logbuf_lock){-...}-{2:2}, at:
vprintk_emit+0xb0/0x358
[    5.452630]
[    5.452633] stack backtrace:
[    5.452636] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc3 #1
[    5.452640] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
[    5.452643] Call trace:
[    5.452646]  dump_backtrace+0x0/0x1f8
[    5.452649]  show_stack+0x2c/0x38
[    5.452652]  dump_stack+0xec/0x15c
[    5.452656]  lockdep_rcu_suspicious+0xd4/0xf8
[    5.452659]  lock_release+0x338/0x360
[    5.452662]  _raw_spin_unlock+0x3c/0xa0
[    5.452665]  vprintk_emit+0xf8/0x358
[    5.452669]  vprintk_default+0x48/0x58
[    5.452671]  vprintk_func+0xec/0x2b8
[    5.452674]  printk+0x74/0x94
[    5.452677]  lockdep_rcu_suspicious+0x28/0xf8
[    5.452680]  lock_acquire+0x3d0/0x440
[    5.452683]  _raw_spin_lock_irqsave+0x80/0xb0
[    5.452686]  __pm_runtime_suspend+0x34/0x1d0
[    5.452690]  psci_enter_domain_idle_state+0x4c/0xb0
[    5.452693]  cpuidle_enter_state+0xc8/0x610
[    5.452696]  cpuidle_enter+0x3c/0x50
[    5.452698]  call_cpuidle+0x44/0x80
[    5.452701]  do_idle+0x240/0x2a0
[    5.452704]  cpu_startup_entry+0x2c/0x78
[    5.452708]  rest_init+0x1ac/0x280
[    5.452711]  arch_call_rest_init+0x14/0x1c
[    5.452714]  start_kernel+0x50c/0x544

full test log link,
https://qa-reports.linaro.org/lkft/linux-mainline-oe/build/v5.9-rc3/testrun/3137660/suite/linux-log-parser/test/check-kernel-warning-1722813/log

-- 
Linaro LKFT
https://lkft.linaro.org