linux-kernel - [BUG] blocked task after exynos_drm

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Date:	Thu, 06 Nov 2014 10:06:51 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Inki Dae <inki.dae@...sung.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Cc:	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	a.hajda@...sung.com
Subject: [BUG] blocked task after exynos_drm_init

Hi,

On last next (next-20141104, next-20141105) booting locks after
initializing Exynos DRM (Trats2 board):

[    2.028283] [drm] Initialized drm 1.1.0 20060810
[  240.505795] INFO: task swapper/0:1 blocked for more than 120 seconds.
[  240.510825]       Not tainted 3.18.0-rc3-next-20141105 #794
[  240.516418] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  240.524173] swapper/0       D c052534c     0     1      0 0x00000000
[  240.530527] [<c052534c>] (__schedule) from [<c0525b34>] (schedule_preempt_disabled+0x14/0x20)
[  240.539030] [<c0525b34>] (schedule_preempt_disabled) from [<c0526d44>] (mutex_lock_nested+0x1c4/0x464)
[  240.548320] [<c0526d44>] (mutex_lock_nested) from [<c02be908>] (__driver_attach+0x48/0x98)
[  240.556562] [<c02be908>] (__driver_attach) from [<c02bcc00>] (bus_for_each_dev+0x54/0x88)
[  240.564717] [<c02bcc00>] (bus_for_each_dev) from [<c02bdce0>] (bus_add_driver+0xe4/0x200)
[  240.572876] [<c02bdce0>] (bus_add_driver) from [<c02bef94>] (driver_register+0x78/0xf4)
[  240.580864] [<c02bef94>] (driver_register) from [<c029e99c>] (exynos_drm_platform_probe+0x34/0x234)
[  240.589890] [<c029e99c>] (exynos_drm_platform_probe) from [<c02bfcf0>] (platform_drv_probe+0x48/0xa4)
[  240.599090] [<c02bfcf0>] (platform_drv_probe) from [<c02be680>] (driver_probe_device+0x13c/0x37c)
[  240.607940] [<c02be680>] (driver_probe_device) from [<c02be954>] (__driver_attach+0x94/0x98)
[  240.616360] [<c02be954>] (__driver_attach) from [<c02bcc00>] (bus_for_each_dev+0x54/0x88)
[  240.624517] [<c02bcc00>] (bus_for_each_dev) from [<c02bdce0>] (bus_add_driver+0xe4/0x200)
[  240.632679] [<c02bdce0>] (bus_add_driver) from [<c02bef94>] (driver_register+0x78/0xf4)
[  240.640667] [<c02bef94>] (driver_register) from [<c029e938>] (exynos_drm_init+0x70/0xa0)
[  240.648739] [<c029e938>] (exynos_drm_init) from [<c00089b0>] (do_one_initcall+0xac/0x1f0)
[  240.656914] [<c00089b0>] (do_one_initcall) from [<c074bd90>] (kernel_init_freeable+0x10c/0x1d8)
[  240.665591] [<c074bd90>] (kernel_init_freeable) from [<c051eabc>] (kernel_init+0x8/0xec)
[  240.673661] [<c051eabc>] (kernel_init) from [<c000f268>] (ret_from_fork+0x14/0x2c)
[  240.681196] 3 locks held by swapper/0/1:
[  240.685091]  #0:  (&dev->mutex){......}, at: [<c02be908>] __driver_attach+0x48/0x98
[  240.692732]  #1:  (&dev->mutex){......}, at: [<c02be918>] __driver_attach+0x58/0x98
[  240.700367]  #2:  (&dev->mutex){......}, at: [<c02be908>] __driver_attach+0x48/0x98

Full dmesg and config attached.

Best regards,
Krzysztof


View attachment "exynos-drm-lockup-bug.txt" of type "text/plain" (10535 bytes)

View attachment "exynos-drm-lockup-config.txt" of type "text/plain" (84593 bytes)