From: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
To: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Javier Martinez Canillas <javier@osg.samsung.com>,
Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: Re: Slow path and cpu lock warnings - MC Next Gen
Date: Wed, 11 Nov 2015 10:30:53 -0200 [thread overview]
Message-ID: <20151111103053.448ac440@recife.lan> (raw)
In-Reply-To: <5640C1DA.7040100@osg.samsung.com>
Em Mon, 09 Nov 2015 08:55:06 -0700
Shuah Khan <shuahkh@osg.samsung.com> escreveu:
> On 11/09/2015 08:51 AM, Shuah Khan wrote:
> > As I mentioned on the IRC, here is the log for the problems I am seeing.
> > I have to do eject HVR 950Q TV stick to see the problem.
> >
> > mc_next_gen.v8.4 branch with no changes.
> >
> > I can test and debug this week.
> >
> > thanks,
> > -- Shuah
> >
>
> Forgot to cc linux-media, just in case others are interested
> and have ideas on debugging.
>
> thanks,
> -- Shuah
> [ 8.558049] ======================================================
> [ 8.558056] [ INFO: possible circular locking dependency detected ]
> [ 8.558063] 4.2.0-rc2+ #21 Not tainted
> [ 8.558070] -------------------------------------------------------
> [ 8.558077] systemd-udevd/143 is trying to acquire lock:
> [ 8.558084] (init_mutex){+.+.+.}, at: [<ffffffffa0001f36>] acpi_video_get_backlight_type+0x17/0x163 [video]
> [ 8.558104]
> but task is already holding lock:
> [ 8.558114] (&(&backlight_notifier)->rwsem){++++..}, at: [<ffffffff8107fc49>] __blocking_notifier_call_chain+0x39/0x70
> [ 8.558133]
> which lock already depends on the new lock.
>
> [ 8.558147]
> the existing dependency chain (in reverse order) is:
> [ 8.558158]
> -> #1 (&(&backlight_notifier)->rwsem){++++..}:
> [ 8.558170] [<ffffffff810b0c61>] lock_acquire+0xb1/0x130
> [ 8.558180] [<ffffffff817fb006>] down_write+0x36/0x70
> [ 8.558189] [<ffffffff8107fdc1>] blocking_notifier_chain_register+0x21/0xb0
> [ 8.558202] [<ffffffff81424c98>] backlight_register_notifier+0x18/0x20
> [ 8.558212] [<ffffffffa0002019>] acpi_video_get_backlight_type+0xfa/0x163 [video]
> [ 8.558225] [<ffffffffa000167e>] acpi_video_bus_add+0x686/0xdfa [video]
> [ 8.558237] [<ffffffff814371b0>] acpi_device_probe+0x50/0xf7
> [ 8.558247] [<ffffffff814db62d>] driver_probe_device+0x14d/0x470
> [ 8.558257] [<ffffffff814db9e4>] __driver_attach+0x94/0xa0
> [ 8.558266] [<ffffffff814d9366>] bus_for_each_dev+0x66/0xa0
> [ 8.558275] [<ffffffff814daece>] driver_attach+0x1e/0x20
> [ 8.558287] [<ffffffff814daa4e>] bus_add_driver+0x1ee/0x280
> [ 8.558296] [<ffffffff814dc280>] driver_register+0x60/0xe0
> [ 8.558304] [<ffffffff81437936>] acpi_bus_register_driver+0x3b/0x43
> [ 8.558313] [<ffffffffa0000328>] acpi_video_register+0x6e/0x90 [video]
> [ 8.558322] [<ffffffffa000b087>] hid_generic_exit+0x87/0x1000 [hid_generic]
> [ 8.558334] [<ffffffff810002eb>] do_one_initcall+0xab/0x1d0
> [ 8.558344] [<ffffffff817f317e>] do_init_module+0x60/0x1e9
> [ 8.558353] [<ffffffff810f1900>] load_module+0x2170/0x2780
> [ 8.558363] [<ffffffff810f212a>] SyS_finit_module+0x9a/0xc0
> [ 8.558372] [<ffffffff817fd5d7>] entry_SYSCALL_64_fastpath+0x12/0x6f
> [ 8.558381]
> -> #0 (init_mutex){+.+.+.}:
> [ 8.558392] [<ffffffff810aff59>] __lock_acquire+0x1f29/0x1f90
> [ 8.558401] [<ffffffff810b0c61>] lock_acquire+0xb1/0x130
> [ 8.558409] [<ffffffff817f9ceb>] mutex_lock_nested+0x4b/0x340
> [ 8.558417] [<ffffffffa0001f36>] acpi_video_get_backlight_type+0x17/0x163 [video]
> [ 8.558430] [<ffffffffa00020ba>] acpi_video_backlight_notify+0x19/0x2f [video]
> [ 8.558442] [<ffffffff8107faad>] notifier_call_chain+0x5d/0x80
> [ 8.558451] [<ffffffff8107fc61>] __blocking_notifier_call_chain+0x51/0x70
> [ 8.558462] [<ffffffff8107fc96>] blocking_notifier_call_chain+0x16/0x20
> [ 8.558474] [<ffffffff81424ff2>] backlight_device_register+0x1a2/0x260
> [ 8.558483] [<ffffffffa02af70a>] radeon_atom_backlight_init+0xda/0x1d0 [radeon]
> [ 8.558543] [<ffffffffa0254713>] radeon_link_encoder_connector+0xc3/0x130 [radeon]
> [ 8.558585] [<ffffffffa0232b06>] radeon_get_atom_connector_info_from_object_table+0x3a6/0x950 [radeon]
> [ 8.558625] [<ffffffffa0257e4c>] radeon_modeset_init+0x5dc/0xa40 [radeon]
> [ 8.558667] [<ffffffffa0230b0b>] radeon_driver_load_kms+0x12b/0x220 [radeon]
> [ 8.558706] [<ffffffffa0033281>] drm_dev_register+0xb1/0x100 [drm]
> [ 8.558728] [<ffffffffa003605d>] drm_get_pci_dev+0x8d/0x1e0 [drm]
> [ 8.558747] [<ffffffffa022c404>] radeon_pci_probe+0xa4/0xc0 [radeon]
> [ 8.558783] [<ffffffff813f3715>] local_pci_probe+0x45/0xa0
> [ 8.558792] [<ffffffff813f4911>] pci_device_probe+0xd1/0x120
> [ 8.558800] [<ffffffff814db62d>] driver_probe_device+0x14d/0x470
> [ 8.558809] [<ffffffff814db9e4>] __driver_attach+0x94/0xa0
> [ 8.558818] [<ffffffff814d9366>] bus_for_each_dev+0x66/0xa0
> [ 8.558827] [<ffffffff814daece>] driver_attach+0x1e/0x20
> [ 8.558835] [<ffffffff814daa4e>] bus_add_driver+0x1ee/0x280
> [ 8.558844] [<ffffffff814dc280>] driver_register+0x60/0xe0
> [ 8.558852] [<ffffffff813f2fd4>] __pci_register_driver+0x64/0x70
> [ 8.558860] [<ffffffffa0036290>] drm_pci_init+0xe0/0x110 [drm]
> [ 8.558879] [<ffffffffa039d09d>] radeon_init+0x9d/0xb2 [radeon]
> [ 8.558911] [<ffffffff810002eb>] do_one_initcall+0xab/0x1d0
> [ 8.558920] [<ffffffff817f317e>] do_init_module+0x60/0x1e9
> [ 8.558928] [<ffffffff810f1900>] load_module+0x2170/0x2780
> [ 8.558937] [<ffffffff810f212a>] SyS_finit_module+0x9a/0xc0
> [ 8.558945] [<ffffffff817fd5d7>] entry_SYSCALL_64_fastpath+0x12/0x6f
> [ 8.558954]
> other info that might help us debug this:
>
> [ 8.558968] Possible unsafe locking scenario:
>
> [ 8.558978] CPU0 CPU1
> [ 8.558984] ---- ----
> [ 8.558989] lock(&(&backlight_notifier)->rwsem);
> [ 8.558997] lock(init_mutex);
> [ 8.559004] lock(&(&backlight_notifier)->rwsem);
> [ 8.559015] lock(init_mutex);
> [ 8.559021]
> *** DEADLOCK ***
>
> [ 8.559035] 4 locks held by systemd-udevd/143:
> [ 8.559041] #0: (&dev->mutex){......}, at: [<ffffffff814db99b>] __driver_attach+0x4b/0xa0
> [ 8.559056] #1: (&dev->mutex){......}, at: [<ffffffff814db9a9>] __driver_attach+0x59/0xa0
> [ 8.559072] #2: (drm_global_mutex){+.+.+.}, at: [<ffffffffa00331f6>] drm_dev_register+0x26/0x100 [drm]
> [ 8.559097] #3: (&(&backlight_notifier)->rwsem){++++..}, at: [<ffffffff8107fc49>] __blocking_notifier_call_chain+0x39/0x70
> [ 8.559113]
> stack backtrace:
> [ 8.559124] CPU: 2 PID: 143 Comm: systemd-udevd Not tainted 4.2.0-rc2+ #21
> [ 8.559132] Hardware name: Hewlett-Packard HP ProBook 6475b/180F, BIOS 68TTU Ver. F.04 08/03/2012
> [ 8.559143] ffffffff8285ace0 ffff88002b09f378 ffffffff817f4254 ffffffff810c155a
> [ 8.559156] ffffffff8285ace0 ffff88002b09f3c8 ffffffff810ac6a3 0000000000000003
> [ 8.559169] ffff88002b09f438 ffff88002b09f3c8 ffff88002b06b398 ffff88002b06a600
> [ 8.559181] Call Trace:
> [ 8.559190] [<ffffffff817f4254>] dump_stack+0x45/0x57
> [ 8.559208] [<ffffffff810c155a>] ? console_unlock+0x1da/0x580
> [ 8.559216] [<ffffffff810ac6a3>] print_circular_bug+0x1e3/0x250
> [ 8.559225] [<ffffffff810aff59>] __lock_acquire+0x1f29/0x1f90
> [ 8.559234] [<ffffffff810b0c61>] lock_acquire+0xb1/0x130
> [ 8.559243] [<ffffffffa0001f36>] ? acpi_video_get_backlight_type+0x17/0x163 [video]
> [ 8.559255] [<ffffffff817f9ceb>] mutex_lock_nested+0x4b/0x340
> [ 8.559264] [<ffffffffa0001f36>] ? acpi_video_get_backlight_type+0x17/0x163 [video]
> [ 8.559277] [<ffffffffa0001f36>] acpi_video_get_backlight_type+0x17/0x163 [video]
> [ 8.559289] [<ffffffffa00020ba>] acpi_video_backlight_notify+0x19/0x2f [video]
> [ 8.559301] [<ffffffff8107faad>] notifier_call_chain+0x5d/0x80
> [ 8.559310] [<ffffffff8107fc61>] __blocking_notifier_call_chain+0x51/0x70
> [ 8.559319] [<ffffffff8107fc96>] blocking_notifier_call_chain+0x16/0x20
> [ 8.559327] [<ffffffff81424ff2>] backlight_device_register+0x1a2/0x260
> [ 8.559374] [<ffffffffa02af70a>] radeon_atom_backlight_init+0xda/0x1d0 [radeon]
> [ 8.559416] [<ffffffffa0254713>] radeon_link_encoder_connector+0xc3/0x130 [radeon]
> [ 8.559455] [<ffffffffa0232b06>] radeon_get_atom_connector_info_from_object_table+0x3a6/0x950 [radeon]
> [ 8.559481] [<ffffffffa0038c1b>] ? drm_mode_crtc_set_gamma_size+0x5b/0x70 [drm]
> [ 8.559523] [<ffffffffa0257e4c>] radeon_modeset_init+0x5dc/0xa40 [radeon]
> [ 8.559566] [<ffffffffa03071d8>] ? radeon_ib_ring_tests+0x58/0xc0 [radeon]
> [ 8.559601] [<ffffffffa0230b0b>] radeon_driver_load_kms+0x12b/0x220 [radeon]
> [ 8.559620] [<ffffffffa0033281>] drm_dev_register+0xb1/0x100 [drm]
> [ 8.559639] [<ffffffffa003605d>] drm_get_pci_dev+0x8d/0x1e0 [drm]
> [ 8.559674] [<ffffffffa022c404>] radeon_pci_probe+0xa4/0xc0 [radeon]
> [ 8.559683] [<ffffffff813f3715>] local_pci_probe+0x45/0xa0
> [ 8.559691] [<ffffffff813f47d0>] ? pci_match_device+0xe0/0x110
> [ 8.559699] [<ffffffff813f4911>] pci_device_probe+0xd1/0x120
> [ 8.559708] [<ffffffff814db62d>] driver_probe_device+0x14d/0x470
> [ 8.559717] [<ffffffff814db9e4>] __driver_attach+0x94/0xa0
> [ 8.559726] [<ffffffff814db950>] ? driver_probe_device+0x470/0x470
> [ 8.559734] [<ffffffff814d9366>] bus_for_each_dev+0x66/0xa0
> [ 8.559743] [<ffffffff814daece>] driver_attach+0x1e/0x20
> [ 8.559752] [<ffffffff814daa4e>] bus_add_driver+0x1ee/0x280
> [ 8.559760] [<ffffffff814dc280>] driver_register+0x60/0xe0
> [ 8.559767] [<ffffffff813f2fd4>] __pci_register_driver+0x64/0x70
> [ 8.559786] [<ffffffffa0036290>] drm_pci_init+0xe0/0x110 [drm]
> [ 8.559794] [<ffffffffa039d000>] ? 0xffffffffa039d000
> [ 8.559825] [<ffffffffa039d09d>] radeon_init+0x9d/0xb2 [radeon]
> [ 8.559834] [<ffffffff810002eb>] do_one_initcall+0xab/0x1d0
> [ 8.559843] [<ffffffff817f3146>] ? do_init_module+0x28/0x1e9
> [ 8.559852] [<ffffffff811c5c3b>] ? kmem_cache_alloc_trace+0xbb/0x160
> [ 8.559862] [<ffffffff817f317e>] do_init_module+0x60/0x1e9
> [ 8.559870] [<ffffffff810f1900>] load_module+0x2170/0x2780
> [ 8.559878] [<ffffffff810edd30>] ? __symbol_put+0x40/0x40
> [ 8.559888] [<ffffffff810f212a>] SyS_finit_module+0x9a/0xc0
> [ 8.559897] [<ffffffff817fd5d7>] entry_SYSCALL_64_fastpath+0x12/0x6f
Sorry, but I fail to see how this is related to the V4L2 subsystem.
At least on my eyes, it seems that the bug is somewhere at the Radeon
driver.
Regards,
Mauro
next parent reply other threads:[~2015-11-11 12:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5640C0F2.9070000@osg.samsung.com>
[not found] ` <5640C1DA.7040100@osg.samsung.com>
2015-11-11 12:30 ` Mauro Carvalho Chehab [this message]
2015-11-11 14:22 ` Slow path and cpu lock warnings - MC Next Gen Shuah Khan
2015-11-11 15:36 ` Mauro Carvalho Chehab
2015-11-11 15:49 ` Shuah Khan
2015-11-12 0:25 ` Shuah Khan
2015-11-12 3:25 ` Shuah Khan
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