Re: Odroid U3 mutex deadlock.

From: Anand Moon
Date: Sat Dec 12 2015 - 21:37:47 EST

Hi Thomas,

On 12 December 2015 at 16:58, Thomas Pietrowski <thopiekar@xxxxxxxxx> wrote:
> I'm also using 4.4.0-rc4 here on my U3+. And so far it is working well. I
> just had a freeze yesterday, but I didn't had the UART connected, so
> couldn't catch the reason. The curious thing was that the heartbeat LED was
> still blinking, but USB keyboard and Ethernet/SSH (but LEDs still on) were
> not working.
>
> Could you upload your .config? Maybe it could be useful for others :)
>
> Regards
>
> Am 12.12.2015 05:33 schrieb "Anand Moon" <linux.amoon@xxxxxxxxx>:
>>
>> Hi Krzysztof,
>>
>> I am just observing this deadlock om my Odroid U3.
>>
>> ------------------------------------------------------------------------------------------------------------------
>>
>> [ 2.937531] =============================================
>> [ 2.938733] [ INFO: possible recursive locking detected ]
>> [ 2.944117] 4.4.0-rc4-xu3s #32 Not tainted
>> [ 2.948195] ---------------------------------------------
>> [ 2.953577] swapper/0/1 is trying to acquire lock:
>> [ 2.958351] (&genpd->lock){+.+...}, at: [<c0361550>]
>> __genpd_poweron+0x64/0x108
>> [ 2.965727]
>> [ 2.965727] but task is already holding lock:
>> [ 2.971543] (&genpd->lock){+.+...}, at: [<c0361af8>]
>> genpd_dev_pm_attach+0x168/0x1b8
>> [ 2.979355]
>> [ 2.979355] other info that might help us debug this:
>> [ 2.985865] Possible unsafe locking scenario:
>> [ 2.985865]
>> [ 2.991768] CPU0
>> [ 2.994198] ----
>> [ 2.996628] lock(&genpd->lock);
>> [ 2.999926] lock(&genpd->lock);
>> [ 3.003225]
>> [ 3.003225] *** DEADLOCK ***
>> [ 3.003225]
>> [ 3.009128] May be due to missing lock nesting notation
>> [ 3.009128]
>> [ 3.015900] 3 locks held by swapper/0/1:
>> [ 3.019804] #0: (&dev->mutex){......}, at: [<c0350910>]
>> __driver_attach+0x48/0x98
>> [ 3.027442] #1: (&dev->mutex){......}, at: [<c0350920>]
>> __driver_attach+0x58/0x98
>> [ 3.035081] #2: (&genpd->lock){+.+...}, at: [<c0361af8>]
>> genpd_dev_pm_attach+0x168/0x1b8
>> [ 3.043326]
>> [ 3.043326] stack backtrace:
>> [ 3.047671] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.4.0-rc4-xu3s
>> #32
>> [ 3.054351] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
>> [ 3.060444] [<c0016c98>] (unwind_backtrace) from [<c00139c4>]
>> (show_stack+0x10/0x14)
>> [ 3.068163] [<c00139c4>] (show_stack) from [<c0270df0>]
>> (dump_stack+0x84/0xc4)
>> [ 3.075367] [<c0270df0>] (dump_stack) from [<c00780b8>]
>> (__lock_acquire+0x1f88/0x215c)
>> [ 3.083262] [<c00780b8>] (__lock_acquire) from [<c007886c>]
>> (lock_acquire+0xa4/0xd0)
>> [ 3.090990] [<c007886c>] (lock_acquire) from [<c0641f2c>]
>> (mutex_lock_nested+0x70/0x4d4)
>> [ 3.099061] [<c0641f2c>] (mutex_lock_nested) from [<c0361550>]
>> (__genpd_poweron+0x64/0x108)
>> [ 3.107393] [<c0361550>] (__genpd_poweron) from [<c0361b00>]
>> (genpd_dev_pm_attach+0x170/0x1b8)
>> [ 3.115986] [<c0361b00>] (genpd_dev_pm_attach) from [<c03520a8>]
>> (platform_drv_probe+0x2c/0xac)
>> [ 3.124667] [<c03520a8>] (platform_drv_probe) from [<c03507d4>]
>> (driver_probe_device+0x208/0x2fc)
>> [ 3.133519] [<c03507d4>] (driver_probe_device) from [<c035095c>]
>> (__driver_attach+0x94/0x98)
>> [ 3.141939] [<c035095c>] (__driver_attach) from [<c034ec14>]
>> (bus_for_each_dev+0x68/0x9c)
>> [ 3.150097] [<c034ec14>] (bus_for_each_dev) from [<c034fec8>]
>> (bus_add_driver+0x1a0/0x218)
>> [ 3.158344] [<c034fec8>] (bus_add_driver) from [<c035115c>]
>> (driver_register+0x78/0xf8)
>> [ 3.166330] [<c035115c>] (driver_register) from [<c0338488>]
>> (exynos_drm_register_drivers+0x28/0x74)
>> [ 3.175441] [<c0338488>] (exynos_drm_register_drivers) from
>> [<c0338594>] (exynos_drm_init+0x6c/0xc4)
>> [ 3.184556] [<c0338594>] (exynos_drm_init) from [<c00097f4>]
>> (do_one_initcall+0x90/0x1dc)
>> [ 3.192718] [<c00097f4>] (do_one_initcall) from [<c0895e08>]
>> (kernel_init_freeable+0x158/0x1f8)
>> [ 3.201396] [<c0895e08>] (kernel_init_freeable) from [<c063ecac>]
>> (kernel_init+0x8/0xe8)
>> [ 3.209469] [<c063ecac>] (kernel_init) from [<c000f7d0>]
>> (ret_from_fork+0x14/0x24)
>> [ 3.217932] exynos-hdmi 12d00000.hdmi: GPIO lookup for consumer hpd
>> [ 3.223293] exynos-hdmi 12d00000.hdmi: using device tree for GPIO
>> lookup
>> [ 3.229980] of_get_named_gpiod_flags: can't parse 'hpd-gpios'
>> property of node '/hdmi@12D00000[0]'
>> [ 3.238945] of_get_named_gpiod_flags: parsed 'hpd-gpio' property of
>> node '/hdmi@12D00000[0]' - status (0)
>> [ 3.253430] exynos-drm exynos-drm: bound 12c10000.mixer (ops
>> mixer_component_ops)
>> [ 3.256216] exynos-drm exynos-drm: bound 12d00000.hdmi (ops
>> hdmi_component_ops)
>> [ 3.263245] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
>> [ 3.269812] [drm] No driver support for vblank timestamp query.
>> [ 3.323251] exynos-drm exynos-drm: fb0: frame buffer device
>> [ 3.341464] [drm] Initialized exynos 1.0.0 20110530 on minor 0
>>
>>
>> -----------------------------------------------------------------------------------------------------------------------
>> -Anand Moon

I just using exynos_defconfig + kernel hacking flags.

diff --git a/arch/arm/configs/exynos_defconfig
b/arch/arm/configs/exynos_defconfig
index e0841a5..402a37f 100644
--- a/arch/arm/configs/exynos_defconfig
+++ b/arch/arm/configs/exynos_defconfig
@@ -1,3 +1,4 @@
+# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_SYSVIPC=y
CONFIG_FHANDLE=y
CONFIG_NO_HZ=y
@@ -100,10 +101,8 @@ CONFIG_SENSORS_LM90=y
CONFIG_SENSORS_NTC_THERMISTOR=y
CONFIG_SENSORS_PWM_FAN=y
CONFIG_SENSORS_INA2XX=y
-CONFIG_THERMAL=y
CONFIG_CPU_THERMAL=y
CONFIG_THERMAL_EMULATION=y
-CONFIG_EXYNOS_THERMAL=y
CONFIG_WATCHDOG=y
CONFIG_S3C2410_WATCHDOG=y
CONFIG_MFD_CROS_EC=y
@@ -132,8 +131,6 @@ CONFIG_MEDIA_CAMERA_SUPPORT=y
CONFIG_MEDIA_USB_SUPPORT=y
CONFIG_USB_VIDEO_CLASS=m
CONFIG_DRM=y
-CONFIG_DRM_NXP_PTN3460=y
-CONFIG_DRM_PARADE_PS8622=y
CONFIG_DRM_EXYNOS=y
CONFIG_DRM_EXYNOS_FIMD=y
CONFIG_DRM_EXYNOS_DSI=y
@@ -141,6 +138,8 @@ CONFIG_DRM_EXYNOS_MIXER=y
CONFIG_DRM_EXYNOS_HDMI=y
CONFIG_DRM_PANEL_SIMPLE=y
CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0=y
+CONFIG_DRM_NXP_PTN3460=y
+CONFIG_DRM_PARADE_PS8622=y
CONFIG_EXYNOS_VIDEO=y
CONFIG_EXYNOS_MIPI_DSI=y
CONFIG_LCD_CLASS_DEVICE=y
@@ -219,10 +218,36 @@ CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_FS=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_KERNEL=y
+CONFIG_DEBUG_PAGEALLOC=y
+CONFIG_DEBUG_OBJECTS=y
+CONFIG_DEBUG_OBJECTS_SELFTEST=y
+CONFIG_DEBUG_OBJECTS_FREE=y
+CONFIG_DEBUG_OBJECTS_TIMERS=y
+CONFIG_DEBUG_OBJECTS_WORK=y
+CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
+CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER=y
+CONFIG_DEBUG_SHIRQ=y
CONFIG_LOCKUP_DETECTOR=y
+CONFIG_SCHEDSTATS=y
+CONFIG_SCHED_STACK_END_CHECK=y
+CONFIG_TIMER_STATS=y
CONFIG_DEBUG_RT_MUTEXES=y
-CONFIG_DEBUG_SPINLOCK=y
-CONFIG_DEBUG_MUTEXES=y
+CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y
+CONFIG_PROVE_LOCKING=y
+CONFIG_LOCK_STAT=y
+CONFIG_DEBUG_LOCKDEP=y
+CONFIG_DEBUG_ATOMIC_SLEEP=y
+CONFIG_DEBUG_LOCKING_API_SELFTESTS=y
+CONFIG_LOCK_TORTURE_TEST=m
+CONFIG_DEBUG_PI_LIST=y
+CONFIG_DEBUG_SG=y
+CONFIG_DEBUG_NOTIFIERS=y
+CONFIG_DEBUG_CREDENTIALS=y
+CONFIG_PROVE_RCU_REPEATEDLY=y
+CONFIG_SPARSE_RCU_POINTER=y
+CONFIG_RCU_TORTURE_TEST=m
+CONFIG_RCU_TORTURE_TEST_SLOW_PREINIT=y
+CONFIG_RCU_TRACE=y
CONFIG_DEBUG_USER=y
CONFIG_CRYPTO_SHA256=y
CONFIG_CRC_CCITT=y

-Anand Moon
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