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Message-ID: <577210FF.3090103@intel.com>
Date: Tue, 28 Jun 2016 08:54:07 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Valdis Kletnieks <Valdis.Kletnieks@...edu>,
Ulf Hansson <ulf.hansson@...aro.org>
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next - lockdep whine in MMC/SDHC code
sdhci locking needs work because it is trying to use a spin lock to protect
the whole driver, which isn't possible (and consequently the lock gets
unlocked in the middle of some code) and also has the undesirable
side-effect of disabling irqs. This looks like we should add another hack
to unlock the spin lock when mapping the sg.
Of course the proper fix is to figure out what actually needs to be
protected, but that will take longer.
On 27/06/16 20:44, Valdis Kletnieks wrote:
> This may be indicative of an actual problem, as I've had at least one
> time that subsequently mounting and then trying to access files on the
> partition caused kernel BUGs.
>
> Seen in next-0614 and next-0627. Google reports similar issues, but from
> the 2013/2014 timeframe....
>
> [ 2.610725] NET: Registered protocol family 10
>
> [ 2.623472] ======================================================
> [ 2.623548] [ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]
> [ 2.623638] 4.7.0-rc4-next-20160627-dirty #303 Not tainted
> [ 2.623733] ------------------------------------------------------
> [ 2.623817] kworker/2:1/49 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
> [ 2.623883] (pcpu_alloc_mutex){+.+.+.}, at: [<ffffffffa12f8565>] pcpu_alloc+0x4e5/0x890
> [ 2.623986]
> and this task is already holding:
> [ 2.624044] (&(&host->lock)->rlock#3){-.-...}, at: [<ffffffffa1b19676>] sdhci_request+0x56/0x200
> [ 2.624153] which would create a new lock dependency:
> [ 2.624203] (&(&host->lock)->rlock#3){-.-...} -> (pcpu_alloc_mutex){+.+.+.}
> [ 2.624305]
> but this new dependency connects a HARDIRQ-irq-safe lock:
> [ 2.624381] (&(&host->lock)->rlock#3){-.-...}
> ... which became HARDIRQ-irq-safe at:
> [ 2.624473] [<ffffffffa114df5d>] __lock_acquire+0x6cd/0x1d60
> [ 2.624553] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 2.624661] [<ffffffffa20aba6b>] _raw_spin_lock+0x3b/0x50
> [ 2.624769] [<ffffffffa1b1c41b>] sdhci_irq+0x3b/0xc20
> [ 2.624869] [<ffffffffa1161627>] __handle_irq_event_percpu+0x127/0x690
> [ 2.624993] [<ffffffffa1161bc4>] handle_irq_event_percpu+0x34/0xb0
> [ 2.625110] [<ffffffffa1161c8b>] handle_irq_event+0x4b/0xc0
> [ 2.625218] [<ffffffffa11675df>] handle_fasteoi_irq+0x14f/0x310
> [ 2.625347] [<ffffffffa1037e66>] handle_irq+0xa6/0x2c0
> [ 2.625462] [<ffffffffa20aec28>] do_IRQ+0x88/0x1b0
> [ 2.625571] [<ffffffffa20ad1c9>] ret_from_intr+0x0/0x19
> [ 2.625683] [<ffffffffa1aef227>] cpuidle_enter+0x17/0x20
> [ 2.625786] [<ffffffffa113b88e>] cpu_startup_entry+0x54e/0x720
> [ 2.625910] [<ffffffffa106dc41>] start_secondary+0x1a1/0x250
> [ 2.626035]
> to a HARDIRQ-irq-unsafe lock:
> [ 2.626129] (pcpu_alloc_mutex){+.+.+.}
> ... which became HARDIRQ-irq-unsafe at:
> [ 2.626283] ... [<ffffffffa114dfdc>] __lock_acquire+0x74c/0x1d60
> [ 2.626403] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 2.626522] [<ffffffffa20a5b87>] mutex_lock_nested+0x77/0x620
> [ 2.626648] [<ffffffffa12f8565>] pcpu_alloc+0x4e5/0x890
> [ 2.626764] [<ffffffffa12f8945>] __alloc_percpu+0x15/0x20
> [ 2.626883] [<ffffffffa134eee1>] alloc_kmem_cache_cpus.isra.38+0x31/0x140
> [ 2.627029] [<ffffffffa1353fcd>] __do_tune_cpucache+0x3d/0x220
> [ 2.627145] [<ffffffffa135422f>] enable_cpucache+0x7f/0x160
> [ 2.627251] [<ffffffffa33d43e2>] kmem_cache_init_late+0x85/0x100
> [ 2.627379] [<ffffffffa3369349>] start_kernel+0x4b0/0x78f
> [ 2.627499] [<ffffffffa33673c5>] x86_64_start_reservations+0x5a/0x7b
> [ 2.627637] [<ffffffffa3367729>] x86_64_start_kernel+0x343/0x38a
> [ 2.627765]
> other info that might help us debug this:
>
> [ 2.627898] Possible interrupt unsafe locking scenario:
>
> [ 2.628031] CPU0 CPU1
> [ 2.628123] ---- ----
> [ 2.628213] lock(pcpu_alloc_mutex);
> [ 2.628293] local_irq_disable();
> [ 2.628394] lock(&(&host->lock)->rlock#3);
> [ 2.628531] lock(pcpu_alloc_mutex);
> [ 2.628666] <Interrupt>
> [ 2.628714] lock(&(&host->lock)->rlock#3);
> [ 2.628823]
> *** DEADLOCK ***
>
> [ 2.628924] 3 locks held by kworker/2:1/49:
> [ 2.628998] #0: ("events_freezable"){.+.+.+}, at: [<ffffffffa10e7c19>] process_one_work+0x329/0xd70
> [ 2.629196] #1: ((&(&host->detect)->work)){+.+.+.}, at: [<ffffffffa10e7c19>] process_one_work+0x329/0xd70
> [ 2.634773] #2: (&(&host->lock)->rlock#3){-.-...}, at: [<ffffffffa1b19676>] sdhci_request+0x56/0x200
> [ 2.639936]
> the dependencies between HARDIRQ-irq-safe lock and the holding lock:
> [ 2.650257] -> (&(&host->lock)->rlock#3){-.-...} ops: 205 {
> [ 2.655394] IN-HARDIRQ-W at:
> [ 2.660399] [<ffffffffa114df5d>] __lock_acquire+0x6cd/0x1d60
> [ 2.665557] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 2.670735] [<ffffffffa20aba6b>] _raw_spin_lock+0x3b/0x50
> [ 2.675778] [<ffffffffa1b1c41b>] sdhci_irq+0x3b/0xc20
> [ 2.680851] [<ffffffffa1161627>] __handle_irq_event_percpu+0x127/0x690
> [ 2.685873] [<ffffffffa1161bc4>] handle_irq_event_percpu+0x34/0xb0
> [ 2.690836] [<ffffffffa1161c8b>] handle_irq_event+0x4b/0xc0
> [ 2.695814] [<ffffffffa11675df>] handle_fasteoi_irq+0x14f/0x310
> [ 2.700717] [<ffffffffa1037e66>] handle_irq+0xa6/0x2c0
> [ 2.705614] [<ffffffffa20aec28>] do_IRQ+0x88/0x1b0
> [ 2.710373] [<ffffffffa20ad1c9>] ret_from_intr+0x0/0x19
> [ 2.715092] [<ffffffffa1aef227>] cpuidle_enter+0x17/0x20
> [ 2.719768] [<ffffffffa113b88e>] cpu_startup_entry+0x54e/0x720
> [ 2.724428] [<ffffffffa106dc41>] start_secondary+0x1a1/0x250
> [ 2.729005] IN-SOFTIRQ-W at:
> [ 2.733482] [<ffffffffa114dfa6>] __lock_acquire+0x716/0x1d60
> [ 2.738058] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 2.742639] [<ffffffffa20abc86>] _raw_spin_lock_irqsave+0x46/0x60
> [ 2.747245] [<ffffffffa1b18078>] sdhci_tasklet_finish+0x28/0x2e0
> [ 2.751781] [<ffffffffa10bbf18>] tasklet_action+0x1e8/0x650
> [ 2.756349] [<ffffffffa20af38c>] __do_softirq+0x12c/0xa3c
> [ 2.760820] [<ffffffffa10bc5cf>] irq_exit+0xff/0x160
> [ 2.765330] [<ffffffffa20aec31>] do_IRQ+0x91/0x1b0
> [ 2.769785] [<ffffffffa20ad1c9>] ret_from_intr+0x0/0x19
> [ 2.774219] [<ffffffffa1aef227>] cpuidle_enter+0x17/0x20
> [ 2.778665] [<ffffffffa113b88e>] cpu_startup_entry+0x54e/0x720
> [ 2.783189] [<ffffffffa106dc41>] start_secondary+0x1a1/0x250
> [ 2.787680] INITIAL USE at:
> [ 2.792207] [<ffffffffa114da92>] __lock_acquire+0x202/0x1d60
> [ 2.796776] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 2.801394] [<ffffffffa20abc86>] _raw_spin_lock_irqsave+0x46/0x60
> [ 2.805970] [<ffffffffa1b174b2>] sdhci_set_ios+0x32/0x820
> [ 2.810602] [<ffffffffa1af7777>] mmc_set_initial_state+0x77/0xe0
> [ 2.815221] [<ffffffffa1af7e1d>] mmc_power_off+0x3d/0x60
> [ 2.819795] [<ffffffffa1af9217>] mmc_start_host+0x87/0xa0
> [ 2.824415] [<ffffffffa1afa1ce>] mmc_add_host+0x9e/0x160
> [ 2.828986] [<ffffffffa1b1afdd>] sdhci_add_host+0x6ad/0x1ab0
> [ 2.833530] [<ffffffffa1b1f470>] sdhci_pci_probe+0x670/0xaf0
> [ 2.838192] [<ffffffffa1740afc>] pci_device_probe+0xdc/0x180
> [ 2.842688] [<ffffffffa1890bb1>] driver_probe_device+0x131/0x3c0
> [ 2.847209] [<ffffffffa1890ef9>] __driver_attach+0xb9/0x100
> [ 2.851720] [<ffffffffa188d9aa>] bus_for_each_dev+0x8a/0xf0
> [ 2.856239] [<ffffffffa18900d7>] driver_attach+0x27/0x50
> [ 2.860754] [<ffffffffa188f9b6>] bus_add_driver+0x116/0x2b0
> [ 2.865306] [<ffffffffa189170f>] driver_register+0x9f/0x160
> [ 2.869760] [<ffffffffa173f94f>] __pci_register_driver+0x8f/0xe0
> [ 2.874304] [<ffffffffa342452c>] sdhci_driver_init+0x21/0x45
> [ 2.874582] tsc: Refined TSC clocksource calibration: 2691.248 MHz
> [ 2.874586] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x26caf29c8ab, max_idle_ns: 440795203557 ns
> [ 2.887854] [<ffffffffa100044f>] do_one_initcall+0x5f/0x220
> [ 2.892589] [<ffffffffa3369b26>] kernel_init_freeable+0x4fe/0x62c
> [ 2.897323] [<ffffffffa209e61f>] kernel_init+0xf/0x120
> [ 2.901997] [<ffffffffa20aca7f>] ret_from_fork+0x1f/0x40
> [ 2.906703] }
> [ 2.911234] ... key at: [<ffffffffa441bc38>] __key.34922+0x0/0x8
> [ 2.915907] ... acquired at:
> [ 2.920618] [<ffffffffa114c1ae>] check_irq_usage+0x7e/0x230
> [ 2.925482] [<ffffffffa114f03c>] __lock_acquire+0x17ac/0x1d60
> [ 2.930247] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 2.934992] [<ffffffffa20a5b87>] mutex_lock_nested+0x77/0x620
> [ 2.939794] [<ffffffffa12f8565>] pcpu_alloc+0x4e5/0x890
> [ 2.944667] [<ffffffffa12f8945>] __alloc_percpu+0x15/0x20
> [ 2.949526] [<ffffffffa186e950>] init_iova_domain+0xe0/0x2f0
> [ 2.954284] [<ffffffffa187cbc7>] get_domain_for_dev.constprop.32+0xd7/0x620
> [ 2.959128] [<ffffffffa187d12e>] __get_valid_domain_for_dev+0x1e/0x320
> [ 2.963972] [<ffffffffa187dbd1>] intel_map_sg+0x281/0x3b0
> [ 2.968893] [<ffffffffa1b18415>] sdhci_pre_dma_transfer+0xe5/0x1c0
> [ 2.973867] [<ffffffffa1b187a3>] sdhci_prepare_data+0x223/0xa40
> [ 2.978671] [<ffffffffa1b1929d>] sdhci_send_command+0x17d/0x500
> [ 2.983484] [<ffffffffa1b19755>] sdhci_request+0x135/0x200
> [ 2.988136] [<ffffffffa1af56cf>] __mmc_start_request+0x8f/0x420
> [ 2.992768] [<ffffffffa1af5c73>] mmc_start_request+0x213/0x360
> [ 2.997307] [<ffffffffa1af5e1b>] __mmc_start_req+0x5b/0xd0
> [ 3.001814] [<ffffffffa1af6917>] mmc_wait_for_req+0x17/0x30
> [ 3.006328] [<ffffffffa1b050e7>] mmc_app_send_scr+0x1a7/0x250
> [ 3.010813] [<ffffffffa1b03022>] mmc_sd_setup_card+0x32/0x810
> [ 3.015264] [<ffffffffa1b0398c>] mmc_sd_init_card+0x18c/0xad0
> [ 3.019711] [<ffffffffa1b0467d>] mmc_attach_sd+0xfd/0x210
> [ 3.024160] [<ffffffffa1af8fa8>] mmc_rescan+0x328/0x510
> [ 3.028608] [<ffffffffa10e7cab>] process_one_work+0x3bb/0xd70
> [ 3.032999] [<ffffffffa10e89b1>] worker_thread+0x351/0xad0
> [ 3.037384] [<ffffffffa10f1982>] kthread+0x142/0x1b0
> [ 3.041807] [<ffffffffa20aca7f>] ret_from_fork+0x1f/0x40
>
> [ 3.050650]
> the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock:
> [ 3.059609] -> (pcpu_alloc_mutex){+.+.+.} ops: 619 {
> [ 3.064119] HARDIRQ-ON-W at:
> [ 3.068639] [<ffffffffa114dfdc>] __lock_acquire+0x74c/0x1d60
> [ 3.073249] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 3.077760] [<ffffffffa20a5b87>] mutex_lock_nested+0x77/0x620
> [ 3.082253] [<ffffffffa12f8565>] pcpu_alloc+0x4e5/0x890
> [ 3.086737] [<ffffffffa12f8945>] __alloc_percpu+0x15/0x20
> [ 3.091270] [<ffffffffa134eee1>] alloc_kmem_cache_cpus.isra.38+0x31/0x140
> [ 3.095772] [<ffffffffa1353fcd>] __do_tune_cpucache+0x3d/0x220
> [ 3.100352] [<ffffffffa135422f>] enable_cpucache+0x7f/0x160
> [ 3.104864] [<ffffffffa33d43e2>] kmem_cache_init_late+0x85/0x100
> [ 3.109433] [<ffffffffa3369349>] start_kernel+0x4b0/0x78f
> [ 3.113981] [<ffffffffa33673c5>] x86_64_start_reservations+0x5a/0x7b
> [ 3.118520] [<ffffffffa3367729>] x86_64_start_kernel+0x343/0x38a
> [ 3.123069] SOFTIRQ-ON-W at:
> [ 3.127629] [<ffffffffa114e015>] __lock_acquire+0x785/0x1d60
> [ 3.132296] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 3.136854] [<ffffffffa20a5b87>] mutex_lock_nested+0x77/0x620
> [ 3.141453] [<ffffffffa12f8565>] pcpu_alloc+0x4e5/0x890
> [ 3.145994] [<ffffffffa12f8945>] __alloc_percpu+0x15/0x20
> [ 3.150480] [<ffffffffa134eee1>] alloc_kmem_cache_cpus.isra.38+0x31/0x140
> [ 3.155045] [<ffffffffa1353fcd>] __do_tune_cpucache+0x3d/0x220
> [ 3.159641] [<ffffffffa135422f>] enable_cpucache+0x7f/0x160
> [ 3.164284] [<ffffffffa33d43e2>] kmem_cache_init_late+0x85/0x100
> [ 3.168856] [<ffffffffa3369349>] start_kernel+0x4b0/0x78f
> [ 3.173482] [<ffffffffa33673c5>] x86_64_start_reservations+0x5a/0x7b
> [ 3.178110] [<ffffffffa3367729>] x86_64_start_kernel+0x343/0x38a
> [ 3.182712] RECLAIM_FS-ON-W at:
> [ 3.187278] [<ffffffffa114d14d>] mark_held_locks+0x8d/0x150
> [ 3.191954] [<ffffffffa115077b>] lockdep_trace_alloc+0xcb/0x150
> [ 3.196718] [<ffffffffa1351f57>] __kmalloc+0x97/0x4b0
> [ 3.201472] [<ffffffffa12f7376>] pcpu_mem_zalloc+0xe6/0x140
> [ 3.206170] [<ffffffffa12f753f>] pcpu_create_chunk+0x2f/0x1a0
> [ 3.210907] [<ffffffffa12f82f0>] pcpu_alloc+0x270/0x890
> [ 3.215647] [<ffffffffa12f8945>] __alloc_percpu+0x15/0x20
> [ 3.220404] [<ffffffffa134eee1>] alloc_kmem_cache_cpus.isra.38+0x31/0x140
> [ 3.225091] [<ffffffffa1353fcd>] __do_tune_cpucache+0x3d/0x220
> [ 3.229719] [<ffffffffa135422f>] enable_cpucache+0x7f/0x160
> [ 3.234310] [<ffffffffa20a0292>] setup_cpu_cache+0x1a2/0x270
> [ 3.238822] [<ffffffffa13545c7>] __kmem_cache_create+0x247/0x300
> [ 3.243394] [<ffffffffa12fbf2b>] kmem_cache_create+0x11b/0x230
> [ 3.247946] [<ffffffffa33ac4ac>] init_workqueues+0xc1/0xe53
> [ 3.252501] [<ffffffffa100044f>] do_one_initcall+0x5f/0x220
> [ 3.256971] [<ffffffffa336985b>] kernel_init_freeable+0x233/0x62c
> [ 3.261471] [<ffffffffa209e61f>] kernel_init+0xf/0x120
> [ 3.265885] [<ffffffffa20aca7f>] ret_from_fork+0x1f/0x40
> [ 3.270377] INITIAL USE at:
> [ 3.274761] [<ffffffffa114da92>] __lock_acquire+0x202/0x1d60
> [ 3.279317] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 3.283845] [<ffffffffa20a5b87>] mutex_lock_nested+0x77/0x620
> [ 3.288413] [<ffffffffa12f8565>] pcpu_alloc+0x4e5/0x890
> [ 3.292894] [<ffffffffa12f8945>] __alloc_percpu+0x15/0x20
> [ 3.297326] [<ffffffffa134eee1>] alloc_kmem_cache_cpus.isra.38+0x31/0x140
> [ 3.301818] [<ffffffffa20a0123>] setup_cpu_cache+0x33/0x270
> [ 3.306352] [<ffffffffa13545c7>] __kmem_cache_create+0x247/0x300
> [ 3.310848] [<ffffffffa33cbff4>] create_boot_cache+0xe5/0x12e
> [ 3.315393] [<ffffffffa33d4255>] kmem_cache_init+0x10f/0x217
> [ 3.319912] [<ffffffffa33691b9>] start_kernel+0x320/0x78f
> [ 3.324483] [<ffffffffa33673c5>] x86_64_start_reservations+0x5a/0x7b
> [ 3.329007] [<ffffffffa3367729>] x86_64_start_kernel+0x343/0x38a
> [ 3.333542] }
> [ 3.337975] ... key at: [<ffffffffa2867c40>] pcpu_alloc_mutex+0x60/0x80
> [ 3.342589] ... acquired at:
> [ 3.347105] [<ffffffffa114c1ae>] check_irq_usage+0x7e/0x230
> [ 3.351719] [<ffffffffa114f03c>] __lock_acquire+0x17ac/0x1d60
> [ 3.356432] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 3.361108] [<ffffffffa20a5b87>] mutex_lock_nested+0x77/0x620
> [ 3.365787] [<ffffffffa12f8565>] pcpu_alloc+0x4e5/0x890
> [ 3.370513] [<ffffffffa12f8945>] __alloc_percpu+0x15/0x20
> [ 3.375157] [<ffffffffa186e950>] init_iova_domain+0xe0/0x2f0
> [ 3.379852] [<ffffffffa187cbc7>] get_domain_for_dev.constprop.32+0xd7/0x620
> [ 3.384633] [<ffffffffa187d12e>] __get_valid_domain_for_dev+0x1e/0x320
> [ 3.389409] [<ffffffffa187dbd1>] intel_map_sg+0x281/0x3b0
> [ 3.394172] [<ffffffffa1b18415>] sdhci_pre_dma_transfer+0xe5/0x1c0
> [ 3.398905] [<ffffffffa1b187a3>] sdhci_prepare_data+0x223/0xa40
> [ 3.403619] [<ffffffffa1b1929d>] sdhci_send_command+0x17d/0x500
> [ 3.408322] [<ffffffffa1b19755>] sdhci_request+0x135/0x200
> [ 3.412905] [<ffffffffa1af56cf>] __mmc_start_request+0x8f/0x420
> [ 3.417563] [<ffffffffa1af5c73>] mmc_start_request+0x213/0x360
> [ 3.422143] [<ffffffffa1af5e1b>] __mmc_start_req+0x5b/0xd0
> [ 3.426748] [<ffffffffa1af6917>] mmc_wait_for_req+0x17/0x30
> [ 3.431414] [<ffffffffa1b050e7>] mmc_app_send_scr+0x1a7/0x250
> [ 3.435959] [<ffffffffa1b03022>] mmc_sd_setup_card+0x32/0x810
> [ 3.440524] [<ffffffffa1b0398c>] mmc_sd_init_card+0x18c/0xad0
> [ 3.445025] [<ffffffffa1b0467d>] mmc_attach_sd+0xfd/0x210
> [ 3.449502] [<ffffffffa1af8fa8>] mmc_rescan+0x328/0x510
> [ 3.453955] [<ffffffffa10e7cab>] process_one_work+0x3bb/0xd70
> [ 3.458483] [<ffffffffa10e89b1>] worker_thread+0x351/0xad0
> [ 3.462973] [<ffffffffa10f1982>] kthread+0x142/0x1b0
> [ 3.467374] [<ffffffffa20aca7f>] ret_from_fork+0x1f/0x40
>
> [ 3.476160]
> stack backtrace:
> [ 3.484669] CPU: 2 PID: 49 Comm: kworker/2:1 Not tainted 4.7.0-rc4-next-20160627-dirty #303
> [ 3.489073] Hardware name: Dell Inc. Latitude E6530/07Y85M, BIOS A17 08/19/2015
> [ 3.493558] Workqueue: events_freezable mmc_rescan
> [ 3.498110] 0000000000000000 00000000347c66ec ffff8800c6dbb2c8 ffffffffa16afa6a
> [ 3.502690] 0000000000000000 00000000347c66ec ffffffffa3c5e4d0 ffff8800c6db5580
> [ 3.507305] ffff8800c6dbb3e0 ffffffffa114c0a5 0000000000000000 ffff880000000000
> [ 3.511858] Call Trace:
> [ 3.516441] [<ffffffffa16afa6a>] dump_stack+0x7b/0xd1
> [ 3.520993] [<ffffffffa114c0a5>] check_usage+0x4f5/0x580
> [ 3.525466] [<ffffffffa16dd9f8>] ? find_next_bit+0x18/0x20
> [ 3.529918] [<ffffffffa16af6fc>] ? cpumask_next_and+0x3c/0x70
> [ 3.534456] [<ffffffffa114c1ae>] check_irq_usage+0x7e/0x230
> [ 3.538912] [<ffffffffa114f03c>] __lock_acquire+0x17ac/0x1d60
> [ 3.543346] [<ffffffffa16f3e89>] ? __list_add_rcu+0xa9/0x190
> [ 3.547827] [<ffffffffa114fbc9>] lock_acquire+0x119/0x2d0
> [ 3.552298] [<ffffffffa12f8565>] ? pcpu_alloc+0x4e5/0x890
> [ 3.556776] [<ffffffffa12f8565>] ? pcpu_alloc+0x4e5/0x890
> [ 3.561152] [<ffffffffa20a5b87>] mutex_lock_nested+0x77/0x620
> [ 3.565593] [<ffffffffa12f8565>] ? pcpu_alloc+0x4e5/0x890
> [ 3.569960] [<ffffffffa12f8565>] pcpu_alloc+0x4e5/0x890
> [ 3.574348] [<ffffffffa114d76b>] ? debug_check_no_locks_freed+0xdb/0x200
> [ 3.578788] [<ffffffffa12f8945>] __alloc_percpu+0x15/0x20
> [ 3.583172] [<ffffffffa186e950>] init_iova_domain+0xe0/0x2f0
> [ 3.587614] [<ffffffffa187cbc7>] get_domain_for_dev.constprop.32+0xd7/0x620
> [ 3.592043] [<ffffffffa187d12e>] __get_valid_domain_for_dev+0x1e/0x320
> [ 3.596481] [<ffffffffa187dbd1>] intel_map_sg+0x281/0x3b0
> [ 3.600945] [<ffffffffa1b18415>] sdhci_pre_dma_transfer+0xe5/0x1c0
> [ 3.605486] [<ffffffffa11559a7>] ? do_raw_spin_unlock+0xe7/0x1b0
> [ 3.609959] [<ffffffffa1b187a3>] sdhci_prepare_data+0x223/0xa40
> [ 3.614382] [<ffffffffa1188fee>] ? mod_timer+0x21e/0x5b0
> [ 3.618826] [<ffffffffa1b19676>] ? sdhci_request+0x56/0x200
> [ 3.623219] [<ffffffffa1b1929d>] sdhci_send_command+0x17d/0x500
> [ 3.627636] [<ffffffffa1b19755>] sdhci_request+0x135/0x200
> [ 3.632157] [<ffffffffa1af56cf>] __mmc_start_request+0x8f/0x420
> [ 3.636613] [<ffffffffa1b2239f>] ? led_trigger_event+0x6f/0x90
> [ 3.640997] [<ffffffffa1af5c73>] mmc_start_request+0x213/0x360
> [ 3.645356] [<ffffffffa1af5e1b>] __mmc_start_req+0x5b/0xd0
> [ 3.649694] [<ffffffffa1af6917>] mmc_wait_for_req+0x17/0x30
> [ 3.654018] [<ffffffffa1b050e7>] mmc_app_send_scr+0x1a7/0x250
> [ 3.658412] [<ffffffffa1af2350>] ? mmc_align_data_size+0x20/0x20
> [ 3.662768] [<ffffffffa1b03022>] mmc_sd_setup_card+0x32/0x810
> [ 3.667115] [<ffffffffa1b0398c>] mmc_sd_init_card+0x18c/0xad0
> [ 3.671479] [<ffffffffa10fe31a>] ? preempt_count_sub+0x4a/0x90
> [ 3.675777] [<ffffffffa1af862e>] ? mmc_attach_bus+0x12e/0x170
> [ 3.680108] [<ffffffffa1b0467d>] mmc_attach_sd+0xfd/0x210
> [ 3.684322] [<ffffffffa1af8fa8>] mmc_rescan+0x328/0x510
> [ 3.688560] [<ffffffffa10e7cab>] process_one_work+0x3bb/0xd70
> [ 3.692788] [<ffffffffa10e7c19>] ? process_one_work+0x329/0xd70
> [ 3.697110] [<ffffffffa10e89b1>] worker_thread+0x351/0xad0
> [ 3.701317] [<ffffffffa10e8660>] ? process_one_work+0xd70/0xd70
> [ 3.705564] [<ffffffffa10f1982>] kthread+0x142/0x1b0
> [ 3.709793] [<ffffffffa20aca7f>] ret_from_fork+0x1f/0x40
> [ 3.714004] [<ffffffffa10f1840>] ? kthread_create_on_node+0x280/0x280
> [ 3.718730] ip6_tables: (C) 2000-2006 Netfilter Core Team
> [ 3.721580] mmc0: new high speed SDHC card at address aaaa
>
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