I have some filesystem anomalies and and enabled all kind of debug
stuff and got the following:
[ 1.265237]
[ 1.266761] ======================================================
[ 1.272969] [ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]
[ 1.279699] 3.12.9 #1 Not tainted
[ 1.283032] ------------------------------------------------------
[ 1.289240] kworker/u4:2/43 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
[ 1.296052] (prepare_lock){+.+.+.}, at: [<c03bc8f0>]
clk_prepare_lock+0x3c/0xd8
[ 1.303583]
[ 1.303583] and this task is already holding:
[ 1.309441] (&(&host->lock)->rlock#2){-.-...}, at: [<c03a2e70>]
sdhci_do_set_ios+0x18/0x700
[ 1.318035] which would create a new lock dependency:
[ 1.323107] (&(&host->lock)->rlock#2){-.-...} -> (prepare_lock){+.+.+.}
[ 1.330019]
[ 1.330019] but this new dependency connects a HARDIRQ-irq-safe lock:
[ 1.337964] (&(&host->lock)->rlock#2){-.-...}
... which became HARDIRQ-irq-safe at:
[ 1.345915] [<c0080008>] __lock_acquire+0xac4/0x1df8
[ 1.351113] [<c0081934>] lock_acquire+0xa4/0x158
[ 1.355956] [<c0487480>] _raw_spin_lock+0x40/0x50
[ 1.360889] [<c03a1838>] sdhci_irq+0x18/0xa2c
[ 1.365469] [<c006a190>] handle_irq_event_percpu+0x70/0x2d0
[ 1.371276] [<c006a42c>] handle_irq_event+0x3c/0x5c
[ 1.376376] [<c006d16c>] handle_fasteoi_irq+0xa4/0x138
[ 1.381741] [<c0069b58>] generic_handle_irq+0x20/0x30
[ 1.387017] [<c000eb54>] handle_IRQ+0x38/0x90
[ 1.391600] [<c000850c>] gic_handle_irq+0x28/0x5c
[ 1.396526] [<c0488304>] __irq_svc+0x44/0x78
[ 1.401021] [<c0487c78>] _raw_spin_unlock_irqrestore+0x64/0x68
[ 1.407083] [<c03b0a5c>] of_find_node_by_phandle+0x48/0x58
[ 1.412797] [<c03b108c>] __of_parse_phandle_with_args+0xc0/0x1f8
[ 1.419033] [<c03b1248>] of_parse_phandle_with_args+0x28/0x30
[ 1.425008] [<c027a654>] of_get_named_gpio_flags+0x60/0x88
[ 1.430727] [<c03a652c>] gpio_led_probe+0xa4/0x338
[ 1.435747] [<c02eb1e0>] platform_drv_probe+0x18/0x1c
[ 1.441026] [<c02ea2b0>] driver_probe_device+0xf4/0x208
[ 1.446486] [<c02ea458>] __driver_attach+0x94/0x98
[ 1.451501] [<c02e89ec>] bus_for_each_dev+0x54/0x88
[ 1.456605] [<c02e9984>] bus_add_driver+0xdc/0x264
[ 1.461621] [<c02ea85c>] driver_register+0x78/0xf4
[ 1.466638] [<c0008748>] do_one_initcall+0x34/0x15c
[ 1.471741] [<c0668c24>] kernel_init_freeable+0x158/0x228
[ 1.477374] [<c047d33c>] kernel_init+0x8/0xe4
[ 1.481962] [<c000e328>] ret_from_fork+0x14/0x2c
[ 1.486807]
[ 1.486807] to a HARDIRQ-irq-unsafe lock:
[ 1.492321] (prepare_lock){+.+.+.}
... which became HARDIRQ-irq-unsafe at:
[ 1.499470] ... [<c007e048>] mark_held_locks+0x64/0x138
[ 1.504863] [<c007e1c4>] trace_hardirqs_on_caller+0xa8/0x230
[ 1.510749] [<c0482de8>] mutex_trylock+0x160/0x1f0
[ 1.515764] [<c03bc8c0>] clk_prepare_lock+0xc/0xd8
[ 1.520782] [<c03bd180>] clk_notifier_register+0x24/0xe8
[ 1.526321] [<c0008748>] do_one_initcall+0x34/0x15c
[ 1.531422] [<c0668c24>] kernel_init_freeable+0x158/0x228
[ 1.537050] [<c047d33c>] kernel_init+0x8/0xe4
[ 1.541630] [<c000e328>] ret_from_fork+0x14/0x2c
[ 1.546474]
[ 1.546474] other info that might help us debug this:
[ 1.546474]
[ 1.554515] Possible interrupt unsafe locking scenario:
[ 1.554515]
[ 1.561333] CPU0 CPU1
[ 1.565884] ---- ----
[ 1.570435] lock(prepare_lock);
[ 1.573816] local_irq_disable();
[ 1.579759] lock(&(&host->lock)->rlock#2);
[ 1.586640] lock(prepare_lock);
[ 1.592542] <Interrupt>
[ 1.595180] lock(&(&host->lock)->rlock#2);
[ 1.599713]
[ 1.599713] *** DEADLOCK ***
[ 1.599713]
[ 1.605667] 3 locks held by kworker/u4:2/43:
[ 1.609961] #0: (kmmcd){.+.+..}, at: [<c003cf38>]
process_one_work+0x12c/0x50c
[ 1.617507] #1: ((&(&host->detect)->work)){+.+...}, at:
[<c003cf38>] process_one_work+0x12c/0x50c
[ 1.626704] #2: (&(&host->lock)->rlock#2){-.-...}, at:
[<c03a2e70>] sdhci_do_set_ios+0x18/0x700
[ 1.635752]
the dependencies between HARDIRQ-irq-safe lock and the holding lock:
[ 1.643396] -> (&(&host->lock)->rlock#2){-.-...} ops: 67 {
[ 1.649045] IN-HARDIRQ-W at:
[ 1.652229] [<c0080008>] __lock_acquire+0xac4/0x1df8
[ 1.658987] [<c0081934>] lock_acquire+0xa4/0x158
[ 1.665394] [<c0487480>] _raw_spin_lock+0x40/0x50
[ 1.671888] [<c03a1838>] sdhci_irq+0x18/0xa2c
[ 1.678033] [<c006a190>]
handle_irq_event_percpu+0x70/0x2d0
[ 1.685403] [<c006a42c>] handle_irq_event+0x3c/0x5c
[ 1.692072] [<c006d16c>] handle_fasteoi_irq+0xa4/0x138
[ 1.698999] [<c0069b58>] generic_handle_irq+0x20/0x30
[ 1.705841] [<c000eb54>] handle_IRQ+0x38/0x90
[ 1.711988] [<c000850c>] gic_handle_irq+0x28/0x5c
[ 1.718479] [<c0488304>] __irq_svc+0x44/0x78
[ 1.724539] [<c0487c78>]
_raw_spin_unlock_irqrestore+0x64/0x68
[ 1.732166] [<c03b0a5c>]
of_find_node_by_phandle+0x48/0x58
[ 1.739445] [<c03b108c>]
__of_parse_phandle_with_args+0xc0/0x1f8
[ 1.747246] [<c03b1248>]
of_parse_phandle_with_args+0x28/0x30
[ 1.754784] [<c027a654>]
of_get_named_gpio_flags+0x60/0x88
[ 1.762066] [<c03a652c>] gpio_led_probe+0xa4/0x338
[ 1.768646] [<c02eb1e0>] platform_drv_probe+0x18/0x1c
[ 1.775488] [<c02ea2b0>] driver_probe_device+0xf4/0x208
[ 1.782506] [<c02ea458>] __driver_attach+0x94/0x98
[ 1.789087] [<c02e89ec>] bus_for_each_dev+0x54/0x88
[ 1.795754] [<c02e9984>] bus_add_driver+0xdc/0x264
[ 1.802334] [<c02ea85c>] driver_register+0x78/0xf4
[ 1.808914] [<c0008748>] do_one_initcall+0x34/0x15c
[ 1.815581] [<c0668c24>] kernel_init_freeable+0x158/0x228
[ 1.822772] [<c047d33c>] kernel_init+0x8/0xe4
[ 1.828920] [<c000e328>] ret_from_fork+0x14/0x2c
[ 1.835331] IN-SOFTIRQ-W at:
[ 1.838514] [<c007fb08>] __lock_acquire+0x5c4/0x1df8
[ 1.845270] [<c0081934>] lock_acquire+0xa4/0x158
[ 1.851676] [<c0487580>] _raw_spin_lock_irqsave+0x4c/0x60
[ 1.858866] [<c03a28b4>] sdhci_tasklet_finish+0x14/0x10c
[ 1.865968] [<c00293ec>] tasklet_action+0x6c/0x108
[ 1.872552] [<c0028874>] __do_softirq+0x108/0x2f0
[ 1.879046] [<c0028b14>] do_softirq+0x68/0x70
[ 1.885189] [<c0028e14>] irq_exit+0xb0/0xf4
[ 1.891160] [<c000eb58>] handle_IRQ+0x3c/0x90
[ 1.897307] [<c000850c>] gic_handle_irq+0x28/0x5c
[ 1.903799] [<c0488304>] __irq_svc+0x44/0x78
[ 1.909857] [<c0487c78>]
_raw_spin_unlock_irqrestore+0x64/0x68
[ 1.917484] [<c03b0a5c>]
of_find_node_by_phandle+0x48/0x58
[ 1.924762] [<c03b108c>]
__of_parse_phandle_with_args+0xc0/0x1f8
[ 1.932562] [<c03b1248>]
of_parse_phandle_with_args+0x28/0x30
[ 1.940101] [<c027a654>]
of_get_named_gpio_flags+0x60/0x88
[ 1.947380] [<c03a652c>] gpio_led_probe+0xa4/0x338
[ 1.953960] [<c02eb1e0>] platform_drv_probe+0x18/0x1c
[ 1.960799] [<c02ea2b0>] driver_probe_device+0xf4/0x208
[ 1.967816] [<c02ea458>] __driver_attach+0x94/0x98
[ 1.974397] [<c02e89ec>] bus_for_each_dev+0x54/0x88
[ 1.981063] [<c02e9984>] bus_add_driver+0xdc/0x264
[ 1.987643] [<c02ea85c>] driver_register+0x78/0xf4
[ 1.994223] [<c0008748>] do_one_initcall+0x34/0x15c
[ 2.000890] [<c0668c24>] kernel_init_freeable+0x158/0x228
[ 2.008082] [<c047d33c>] kernel_init+0x8/0xe4
[ 2.014228] [<c000e328>] ret_from_fork+0x14/0x2c
[ 2.020636] INITIAL USE at:
[ 2.023731] [<c007f844>] __lock_acquire+0x300/0x1df8
[ 2.030400] [<c0081934>] lock_acquire+0xa4/0x158
[ 2.036720] [<c0487580>] _raw_spin_lock_irqsave+0x4c/0x60
[ 2.043823] [<c03a2e70>] sdhci_do_set_ios+0x18/0x700
[ 2.050491] [<c03907d0>] mmc_power_up+0x78/0xdc
[ 2.056726] [<c03913d4>] mmc_start_host+0x38/0x50
[ 2.063133] [<c03920ac>] mmc_add_host+0x58/0x74
[ 2.069368] [<c03a3d50>] sdhci_add_host+0x7f0/0xba8
[ 2.075950] [<c03a50c8>] sdhci_esdhc_imx_probe+0x28c/0x4f0
[ 2.083139] [<c02eb1e0>] platform_drv_probe+0x18/0x1c
[ 2.089892] [<c02ea2b0>] driver_probe_device+0xf4/0x208
[ 2.096823] [<c02ea458>] __driver_attach+0x94/0x98
[ 2.103317] [<c02e89ec>] bus_for_each_dev+0x54/0x88
[ 2.109897] [<c02e9984>] bus_add_driver+0xdc/0x264
[ 2.116390] [<c02ea85c>] driver_register+0x78/0xf4
[ 2.122883] [<c0008748>] do_one_initcall+0x34/0x15c
[ 2.129465] [<c0668c24>] kernel_init_freeable+0x158/0x228
[ 2.136571] [<c047d33c>] kernel_init+0x8/0xe4
[ 2.142631] [<c000e328>] ret_from_fork+0x14/0x2c
[ 2.148953] }
[ 2.150636] ... key at: [<c0cbebb8>] __key.24056+0x0/0x8
[ 2.156525] ... acquired at:
[ 2.159512] [<c007d58c>] check_irq_usage+0x50/0xb0
[ 2.164616] [<c0080560>] __lock_acquire+0x101c/0x1df8
[ 2.169980] [<c0081934>] lock_acquire+0xa4/0x158
[ 2.174908] [<c04849f8>] mutex_lock_nested+0x58/0x3e0
[ 2.180270] [<c03bc8f0>] clk_prepare_lock+0x3c/0xd8
[ 2.185461] [<c03bd3f0>] clk_get_rate+0xc/0x5c
[ 2.190214] [<c03a4940>] esdhc_pltfm_set_clock+0x14/0x1cc
[ 2.195925] [<c03a24d4>] sdhci_set_clock+0x44/0x410
[ 2.201113] [<c03a3168>] sdhci_do_set_ios+0x310/0x700
[ 2.206474] [<c0390468>] mmc_set_chip_select+0x18/0x1c
[ 2.211924] [<c0394838>] mmc_go_idle+0xdc/0xf8
[ 2.216680] [<c0392b34>] mmc_init_card+0x48/0x1424
[ 2.221781] [<c03940e0>] mmc_attach_mmc+0xc4/0x1cc
[ 2.226882] [<c039134c>] mmc_rescan+0x280/0x2d0
[ 2.231720] [<c003cfb4>] process_one_work+0x1a8/0x50c
[ 2.237082] [<c003d748>] worker_thread+0x144/0x3a4
[ 2.242182] [<c0043de0>] kthread+0xa4/0xb0
[ 2.246595] [<c000e328>] ret_from_fork+0x14/0x2c
[ 2.251524]
[ 2.253033]
the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock:
[ 2.261455] -> (prepare_lock){+.+.+.} ops: 312 {
[ 2.266213] HARDIRQ-ON-W at:
[ 2.269396] [<c007e048>] mark_held_locks+0x64/0x138
[ 2.276067] [<c007e1c4>]
trace_hardirqs_on_caller+0xa8/0x230
[ 2.283521] [<c0482de8>] mutex_trylock+0x160/0x1f0
[ 2.290101] [<c03bc8c0>] clk_prepare_lock+0xc/0xd8
[ 2.296682] [<c03bd180>] clk_notifier_register+0x24/0xe8
[ 2.303785] [<c0008748>] do_one_initcall+0x34/0x15c
[ 2.310452] [<c0668c24>] kernel_init_freeable+0x158/0x228
[ 2.317645] [<c047d33c>] kernel_init+0x8/0xe4
[ 2.323791] [<c000e328>] ret_from_fork+0x14/0x2c
[ 2.330199] SOFTIRQ-ON-W at:
[ 2.333383] [<c007e048>] mark_held_locks+0x64/0x138
[ 2.340053] [<c007e228>]
trace_hardirqs_on_caller+0x10c/0x230
[ 2.347594] [<c0482de8>] mutex_trylock+0x160/0x1f0
[ 2.354175] [<c03bc8c0>] clk_prepare_lock+0xc/0xd8
[ 2.360755] [<c03bd180>] clk_notifier_register+0x24/0xe8
[ 2.367858] [<c0008748>] do_one_initcall+0x34/0x15c
[ 2.374525] [<c0668c24>] kernel_init_freeable+0x158/0x228
[ 2.381716] [<c047d33c>] kernel_init+0x8/0xe4
[ 2.387862] [<c000e328>] ret_from_fork+0x14/0x2c
[ 2.394270] RECLAIM_FS-ON-W at:
[ 2.397715] [<c007e048>] mark_held_locks+0x64/0x138
[ 2.404645] [<c007e9e8>]
lockdep_trace_alloc+0x90/0x10c
[ 2.411926] [<c0106494>]
kmem_cache_alloc_trace+0x34/0x1e0
[ 2.419470] [<c03bd204>]
clk_notifier_register+0xa8/0xe8
[ 2.426837] [<c0008748>] do_one_initcall+0x34/0x15c
[ 2.433765] [<c0668c24>]
kernel_init_freeable+0x158/0x228
[ 2.441220] [<c047d33c>] kernel_init+0x8/0xe4
[ 2.447627] [<c000e328>] ret_from_fork+0x14/0x2c
[ 2.454297] INITIAL USE at:
[ 2.457393] [<c007f844>] __lock_acquire+0x300/0x1df8
[ 2.464064] [<c0081934>] lock_acquire+0xa4/0x158
[ 2.470386] [<c0482d7c>] mutex_trylock+0xf4/0x1f0
[ 2.476792] [<c03bc8c0>] clk_prepare_lock+0xc/0xd8
[ 2.483285] [<c03be6bc>] __clk_init+0x18/0x428
[ 2.489435] [<c03beb94>] _clk_register+0xc8/0x15c
[ 2.495842] [<c03beccc>] clk_register+0x38/0x80
[ 2.502075] [<c03bf5f0>] clk_register_fixed_rate+0x84/0xcc
[ 2.509267] [<c03bf698>] of_fixed_clk_setup+0x60/0x88
[ 2.516022] [<c06975d0>] of_clk_init+0x3c/0x64
[ 2.522176] [<c0671eb8>] imx6q_timer_init+0xc/0x4c
[ 2.528674] [<c066b2f4>] time_init+0x1c/0x2c
[ 2.534652] [<c0668954>] start_kernel+0x1c4/0x33c
[ 2.541061] [<10008074>] 0x10008074
[ 2.546249] }
[ 2.547933] ... key at: [<c06ee6d8>] prepare_lock+0x38/0x48
[ 2.554087] ... acquired at:
[ 2.557075] [<c007d58c>] check_irq_usage+0x50/0xb0
[ 2.562180] [<c0080560>] __lock_acquire+0x101c/0x1df8
[ 2.567542] [<c0081934>] lock_acquire+0xa4/0x158
[ 2.572470] [<c04849f8>] mutex_lock_nested+0x58/0x3e0
[ 2.577831] [<c03bc8f0>] clk_prepare_lock+0x3c/0xd8
[ 2.583021] [<c03bd3f0>] clk_get_rate+0xc/0x5c
[ 2.587774] [<c03a4940>] esdhc_pltfm_set_clock+0x14/0x1cc
[ 2.593486] [<c03a24d4>] sdhci_set_clock+0x44/0x410
[ 2.598673] [<c03a3168>] sdhci_do_set_ios+0x310/0x700
[ 2.604036] [<c0390468>] mmc_set_chip_select+0x18/0x1c
[ 2.609487] [<c0394838>] mmc_go_idle+0xdc/0xf8
[ 2.614241] [<c0392b34>] mmc_init_card+0x48/0x1424
[ 2.619341] [<c03940e0>] mmc_attach_mmc+0xc4/0x1cc
[ 2.624442] [<c039134c>] mmc_rescan+0x280/0x2d0
[ 2.629282] [<c003cfb4>] process_one_work+0x1a8/0x50c
[ 2.634644] [<c003d748>] worker_thread+0x144/0x3a4
[ 2.639745] [<c0043de0>] kthread+0xa4/0xb0
[ 2.644154] [<c000e328>] ret_from_fork+0x14/0x2c
[ 2.649085]
[ 2.650594]
[ 2.650594] stack backtrace:
[ 2.654984] CPU: 1 PID: 43 Comm: kworker/u4:2 Not tainted 3.12.9 #1
[ 2.661285] Workqueue: kmmcd mmc_rescan
[ 2.665188] [<c00144d4>] (unwind_backtrace+0x0/0xf8) from
[<c0011a3c>] (show_stack+0x10/0x14)
[ 2.673766] [<c0011a3c>] (show_stack+0x10/0x14) from [<c0481f58>]
(dump_stack+0x64/0xa4)
[ 2.681905] [<c0481f58>] (dump_stack+0x64/0xa4) from [<c007d368>]
(check_usage+0x408/0x5dc)
[ 2.690302] [<c007d368>] (check_usage+0x408/0x5dc) from
[<c007d58c>] (check_irq_usage+0x50/0xb0)
[ 2.699130] [<c007d58c>] (check_irq_usage+0x50/0xb0) from
[<c0080560>] (__lock_acquire+0x101c/0x1df8)
[ 2.708395] [<c0080560>] (__lock_acquire+0x101c/0x1df8) from
[<c0081934>] (lock_acquire+0xa4/0x158)
[ 2.717483] [<c0081934>] (lock_acquire+0xa4/0x158) from
[<c04849f8>] (mutex_lock_nested+0x58/0x3e0)
[ 2.726576] [<c04849f8>] (mutex_lock_nested+0x58/0x3e0) from
[<c03bc8f0>] (clk_prepare_lock+0x3c/0xd8)
[ 2.735929] [<c03bc8f0>] (clk_prepare_lock+0x3c/0xd8) from
[<c03bd3f0>] (clk_get_rate+0xc/0x5c)
[ 2.744670] [<c03bd3f0>] (clk_get_rate+0xc/0x5c) from [<c03a4940>]
(esdhc_pltfm_set_clock+0x14/0x1cc)
[ 2.753932] [<c03a4940>] (esdhc_pltfm_set_clock+0x14/0x1cc) from
[<c03a24d4>] (sdhci_set_clock+0x44/0x410)
[ 2.763631] [<c03a24d4>] (sdhci_set_clock+0x44/0x410) from
[<c03a3168>] (sdhci_do_set_ios+0x310/0x700)
[ 2.772982] [<c03a3168>] (sdhci_do_set_ios+0x310/0x700) from
[<c0390468>] (mmc_set_chip_select+0x18/0x1c)
[ 2.782595] [<c0390468>] (mmc_set_chip_select+0x18/0x1c) from
[<c0394838>] (mmc_go_idle+0xdc/0xf8)
[ 2.791597] [<c0394838>] (mmc_go_idle+0xdc/0xf8) from [<c0392b34>]
(mmc_init_card+0x48/0x1424)
[ 2.800249] [<c0392b34>] (mmc_init_card+0x48/0x1424) from
[<c03940e0>] (mmc_attach_mmc+0xc4/0x1cc)
[ 2.809251] [<c03940e0>] (mmc_attach_mmc+0xc4/0x1cc) from
[<c039134c>] (mmc_rescan+0x280/0x2d0)
[ 2.817988] [<c039134c>] (mmc_rescan+0x280/0x2d0) from [<c003cfb4>]
(process_one_work+0x1a8/0x50c)
[ 2.826988] [<c003cfb4>] (process_one_work+0x1a8/0x50c) from
[<c003d748>] (worker_thread+0x144/0x3a4)
[ 2.836253] [<c003d748>] (worker_thread+0x144/0x3a4) from
[<c0043de0>] (kthread+0xa4/0xb0)
[ 2.844562] [<c0043de0>] (kthread+0xa4/0xb0) from [<c000e328>]
(ret_from_fork+0x14/0x2c)
[ 2.854183] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[ 2.860894] [drm] No driver support for vblank timestamp query.
[ 2.866875] [drm] Initialized imx-drm 1.0.0 20120507 on minor 0
[ 2.874731] imx-ipuv3 2400000.ipu: IPUv3H probed
[ 2.880040] imx-ipuv3 2800000.ipu: IPUv3H probed
[ 2.885687] TCP: cubic registered
[ 2.889041] NET: Registered protocol family 17
[ 2.893719] Key type dns_resolver registered
[ 2.898360] ThumbEE CPU extension supported.
[ 2.902728] Registering SWP/SWPB emulation handler
[ 2.908105] registered taskstats version 1
[ 2.913186] ci_hdrc ci_hdrc.0: doesn't support gadget
[ 2.918284] ci_hdrc ci_hdrc.0: EHCI Host Controller
[ 2.923253] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
[ 2.924028] mmc0: BKOPS_EN bit is not set
[ 2.930922] mmc0: new high speed MMC card at address 0001
[ 2.939922] mmcblk0: mmc0:0001 SEM04G 3.68 GiB
[ 2.945589] mmcblk0: p1 p2
[ 2.959204] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
Any ideas?
--
Christian Gmeiner, MSc
https://soundcloud.com/christian-gmeiner
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