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Message-ID: <CA+icZUVoUx3qMp7oChVyo8yN6D+Juf3VHqs25aCKShN1czkROw@mail.gmail.com>
Date: Mon, 10 Aug 2015 20:29:00 +0200
From: Sedat Dilek <sedat.dilek@...il.com>
To: Daniel Vetter <daniel.vetter@...ll.ch>,
Dave Airlie <airlied@...hat.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Len Brown <lenb@...nel.org>
Cc: Linux ACPI <linux-acpi@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
intel-gfx <intel-gfx@...ts.freedesktop.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [4.2-rc4] acpi|drm|i915: circular locking dependency: acpi_video_get_backlight_type
On Sat, Aug 1, 2015 at 2:23 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Mon, Jul 27, 2015 at 12:33 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>> Hi,
>>
>> this my first build of a 4.2-rcN Linux-kernel and I see this...
>>
>
> Just FYI:
>
> I am *not* seeing this with drm-intel-nightly from below url.
>
> Also, I plan to test Linux v4.2-rc5.
>
[ CC Linus ]
Knock Knock Knock.
This issue still remains here (with CONFIG_DRM_I915=m)...
[ 18.269792] ======================================================
[ 18.269798] [ INFO: possible circular locking dependency detected ]
[ 18.269805] 4.2.0-rc6-1-iniza-small #1 Not tainted
[ 18.269810] -------------------------------------------------------
[ 18.269816] modprobe/727 is trying to acquire lock:
[ 18.269822] (init_mutex){+.+.+.}, at: [<ffffffffa0090f2d>]
acpi_video_get_backlight_type+0x17/0x164 [video]
[ 18.269840]
[ 18.269840] but task is already holding lock:
[ 18.269848] (&(&backlight_notifier)->rwsem){++++..}, at:
[<ffffffff810a6519>] __blocking_notifier_call_chain+0x39/0x70
[ 18.269864]
[ 18.269864] which lock already depends on the new lock.
[ 18.269864]
[ 18.269875]
[ 18.269875] the existing dependency chain (in reverse order) is:
[ 18.269884]
...
Full dmesg log and kernel-config attached.
Shall I add Rusty and modules/modprobe folks?
- Sedat -
> - Sedat -
>
> [1] http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2015-08-01-unstable/
> [2] http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2015-08-01-unstable/linux-image-4.2.0-994-generic_4.2.0-994.201508010158_amd64.deb
>
>> [ 24.001043] [drm] Memory usable by graphics device = 2048M
>> [ 24.001118] [drm] Replacing VGA console driver
>> [ 24.011642] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
>> [ 24.011646] [drm] Driver supports precise vblank timestamp query.
>> [ 24.012480] vgaarb: device changed decodes:
>> PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
>> [ 24.028005]
>> [ 24.028014] ======================================================
>> [ 24.028020] [ INFO: possible circular locking dependency detected ]
>> [ 24.028027] 4.2.0-rc4-1-iniza-small #1 Not tainted
>> [ 24.028032] -------------------------------------------------------
>> [ 24.028038] modprobe/740 is trying to acquire lock:
>> [ 24.028043] (init_mutex){+.+.+.}, at: [<ffffffffa006af2d>]
>> acpi_video_get_backlight_type+0x17/0x164 [video]
>> [ 24.028060]
>> [ 24.028060] but task is already holding lock:
>> [ 24.028068] (&(&backlight_notifier)->rwsem){++++..}, at:
>> [<ffffffff810a6499>] __blocking_notifier_call_chain+0x39/0x70
>> [ 24.028083]
>> [ 24.028083] which lock already depends on the new lock.
>> [ 24.028083]
>> [ 24.028095]
>> [ 24.028095] the existing dependency chain (in reverse order) is:
>> [ 24.028103]
>> [ 24.028103] -> #1 (&(&backlight_notifier)->rwsem){++++..}:
>> [ 24.028113] [<ffffffff810da56f>] lock_acquire+0xcf/0x280
>> [ 24.028121] [<ffffffff817d6269>] down_write+0x49/0x80
>> [ 24.028129] [<ffffffff810a6611>]
>> blocking_notifier_chain_register+0x21/0xb0
>> [ 24.028138] [<ffffffff814619f8>] backlight_register_notifier+0x18/0x20
>> [ 24.028147] [<ffffffffa006b010>]
>> acpi_video_get_backlight_type+0xfa/0x164 [video]
>> [ 24.028158] [<ffffffffa00a20e9>] 0xffffffffa00a20e9
>> [ 24.028164] [<ffffffff810020f8>] do_one_initcall+0x88/0x1c0
>> [ 24.028172] [<ffffffff817cc9d2>] do_init_module+0x61/0x1ec
>> [ 24.028179] [<ffffffff8111fb78>] load_module+0x2008/0x25c0
>> [ 24.028187] [<ffffffff81120256>] SyS_init_module+0x126/0x140
>> [ 24.028194] [<ffffffff817d8e32>] entry_SYSCALL_64_fastpath+0x16/0x7a
>> [ 24.028202]
>> [ 24.028202] -> #0 (init_mutex){+.+.+.}:
>> [ 24.028211] [<ffffffff810d989d>] __lock_acquire+0x1f5d/0x21c0
>> [ 24.028218] [<ffffffff810da56f>] lock_acquire+0xcf/0x280
>> [ 24.028225] [<ffffffff817d4275>] mutex_lock_nested+0x65/0x3c0
>> [ 24.028233] [<ffffffffa006af2d>]
>> acpi_video_get_backlight_type+0x17/0x164 [video]
>> [ 24.028243] [<ffffffffa006b0b2>]
>> acpi_video_backlight_notify+0x19/0x2f [video]
>> [ 24.028253] [<ffffffff810a629d>] notifier_call_chain+0x5d/0x80
>> [ 24.028260] [<ffffffff810a64b1>]
>> __blocking_notifier_call_chain+0x51/0x70
>> [ 24.028269] [<ffffffff810a64e6>]
>> blocking_notifier_call_chain+0x16/0x20
>> [ 24.028278] [<ffffffff81461d37>] backlight_device_register+0x197/0x240
>> [ 24.028286] [<ffffffffa062bb23>]
>> intel_backlight_register+0xb3/0x180 [i915]
>> [ 24.028336] [<ffffffffa05fe136>]
>> intel_modeset_gem_init+0x176/0x190 [i915]
>> [ 24.028371] [<ffffffffa0633112>] i915_driver_load+0xf12/0x14d0 [i915]
>> [ 24.028406] [<ffffffffa00ec861>] drm_dev_register+0xb1/0x100 [drm]
>> [ 24.028425] [<ffffffffa00ef62d>] drm_get_pci_dev+0x8d/0x1e0 [drm]
>> [ 24.028439] [<ffffffffa057e1fb>] i915_pci_probe+0x3b/0x60 [i915]
>> [ 24.028463] [<ffffffff814317e5>] local_pci_probe+0x45/0xa0
>> [ 24.028470] [<ffffffff81432bad>] pci_device_probe+0xcd/0x120
>> [ 24.028477] [<ffffffff8152d3a6>] driver_probe_device+0x136/0x2e0
>> [ 24.028485] [<ffffffff8152d5e4>] __driver_attach+0x94/0xa0
>> [ 24.028491] [<ffffffff8152b336>] bus_for_each_dev+0x66/0xa0
>> [ 24.028499] [<ffffffff8152cede>] driver_attach+0x1e/0x20
>> [ 24.028506] [<ffffffff8152cad8>] bus_add_driver+0x1b8/0x230
>> [ 24.028513] [<ffffffff8152e580>] driver_register+0x60/0xe0
>> [ 24.028520] [<ffffffff814310a4>] __pci_register_driver+0x64/0x70
>> [ 24.028527] [<ffffffffa00ef860>] drm_pci_init+0xe0/0x110 [drm]
>> [ 24.028540] [<ffffffffa069a0a0>] i915_init+0xa0/0xa8 [i915]
>> [ 24.028563] [<ffffffff810020f8>] do_one_initcall+0x88/0x1c0
>> [ 24.028570] [<ffffffff817cc9d2>] do_init_module+0x61/0x1ec
>> [ 24.028577] [<ffffffff8111fb78>] load_module+0x2008/0x25c0
>> [ 24.028584] [<ffffffff81120256>] SyS_init_module+0x126/0x140
>> [ 24.028591] [<ffffffff817d8e32>] entry_SYSCALL_64_fastpath+0x16/0x7a
>> [ 24.028598]
>> [ 24.028598] other info that might help us debug this:
>> [ 24.028598]
>> [ 24.028609] Possible unsafe locking scenario:
>> [ 24.028609]
>> [ 24.028617] CPU0 CPU1
>> [ 24.028622] ---- ----
>> [ 24.028627] lock(&(&backlight_notifier)->rwsem);
>> [ 24.028633] lock(init_mutex);
>> [ 24.028639]
>> lock(&(&backlight_notifier)->rwsem);
>> [ 24.028648] lock(init_mutex);
>> [ 24.028654]
>> [ 24.028654] *** DEADLOCK ***
>> [ 24.028654]
>> [ 24.028664] 4 locks held by modprobe/740:
>> [ 24.028669] #0: (&dev->mutex){......}, at: [<ffffffff8152d59b>]
>> __driver_attach+0x4b/0xa0
>> [ 24.028681] #1: (&dev->mutex){......}, at: [<ffffffff8152d5a9>]
>> __driver_attach+0x59/0xa0
>> [ 24.028693] #2: (drm_global_mutex){+.+.+.}, at:
>> [<ffffffffa00ec7d6>] drm_dev_register+0x26/0x100 [drm]
>> [ 24.028711] #3: (&(&backlight_notifier)->rwsem){++++..}, at:
>> [<ffffffff810a6499>] __blocking_notifier_call_chain+0x39/0x70
>> [ 24.028725]
>> [ 24.028725] stack backtrace:
>> [ 24.028734] CPU: 1 PID: 740 Comm: modprobe Not tainted
>> 4.2.0-rc4-1-iniza-small #1
>> [ 24.028742] Hardware name: SAMSUNG ELECTRONICS CO., LTD.
>> 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH, BIOS 13XK 03/28/2013
>> [ 24.028753] ffffffff8269fc40 ffff8801188134b8 ffffffff817cea9b
>> 0000000000000011
>> [ 24.028763] ffffffff8269fc40 ffff880118813508 ffffffff817cbfc4
>> ffff8800d3a00b40
>> [ 24.028774] ffff880118813578 ffff8800d3a01410 0000000000000004
>> ffff8800d3a01410
>> [ 24.028784] Call Trace:
>> [ 24.028791] [<ffffffff817cea9b>] dump_stack+0x4c/0x65
>> [ 24.028797] [<ffffffff817cbfc4>] print_circular_bug+0x20b/0x21c
>> [ 24.028804] [<ffffffff810d989d>] __lock_acquire+0x1f5d/0x21c0
>> [ 24.028812] [<ffffffff810da56f>] lock_acquire+0xcf/0x280
>> [ 24.028819] [<ffffffffa006af2d>] ?
>> acpi_video_get_backlight_type+0x17/0x164 [video]
>> [ 24.028830] [<ffffffff817d4275>] mutex_lock_nested+0x65/0x3c0
>> [ 24.028837] [<ffffffffa006af2d>] ?
>> acpi_video_get_backlight_type+0x17/0x164 [video]
>> [ 24.028847] [<ffffffffa006af2d>]
>> acpi_video_get_backlight_type+0x17/0x164 [video]
>> [ 24.028857] [<ffffffffa006b0b2>]
>> acpi_video_backlight_notify+0x19/0x2f [video]
>> [ 24.028866] [<ffffffff810a629d>] notifier_call_chain+0x5d/0x80
>> [ 24.028873] [<ffffffff810a64b1>] __blocking_notifier_call_chain+0x51/0x70
>> [ 24.028880] [<ffffffff810a64e6>] blocking_notifier_call_chain+0x16/0x20
>> [ 24.028887] [<ffffffff81461d37>] backlight_device_register+0x197/0x240
>> [ 24.028920] [<ffffffffa062bb23>] intel_backlight_register+0xb3/0x180 [i915]
>> [ 24.028952] [<ffffffffa05fe136>] intel_modeset_gem_init+0x176/0x190 [i915]
>> [ 24.028984] [<ffffffffa0633112>] i915_driver_load+0xf12/0x14d0 [i915]
>> [ 24.028991] [<ffffffff810d73e9>] ? mark_held_locks+0x69/0x90
>> [ 24.028997] [<ffffffff817d5cd0>] ? __mutex_unlock_slowpath+0xc0/0x180
>> [ 24.029004] [<ffffffff810d73e9>] ? mark_held_locks+0x69/0x90
>> [ 24.029011] [<ffffffff817d84d6>] ? _raw_spin_unlock_irqrestore+0x36/0x60
>> [ 24.029018] [<ffffffff810d7561>] ? trace_hardirqs_on_caller+0x151/0x1e0
>> [ 24.029025] [<ffffffff810d75fd>] ? trace_hardirqs_on+0xd/0x10
>> [ 24.029039] [<ffffffffa00ec861>] drm_dev_register+0xb1/0x100 [drm]
>> [ 24.029052] [<ffffffffa00ef62d>] drm_get_pci_dev+0x8d/0x1e0 [drm]
>> [ 24.029076] [<ffffffffa057e1fb>] i915_pci_probe+0x3b/0x60 [i915]
>> [ 24.029082] [<ffffffff814317e5>] local_pci_probe+0x45/0xa0
>> [ 24.029089] [<ffffffff81432a70>] ? pci_match_device+0xe0/0x110
>> [ 24.029095] [<ffffffff81432bad>] pci_device_probe+0xcd/0x120
>> [ 24.029102] [<ffffffff8152d3a6>] driver_probe_device+0x136/0x2e0
>> [ 24.029109] [<ffffffff8152d5e4>] __driver_attach+0x94/0xa0
>> [ 24.029115] [<ffffffff8152d550>] ? driver_probe_device+0x2e0/0x2e0
>> [ 24.029124] [<ffffffff8152b336>] bus_for_each_dev+0x66/0xa0
>> [ 24.029134] [<ffffffff8152cede>] driver_attach+0x1e/0x20
>> [ 24.029144] [<ffffffff8152cad8>] bus_add_driver+0x1b8/0x230
>> [ 24.029153] [<ffffffff8152e580>] driver_register+0x60/0xe0
>> [ 24.029163] [<ffffffff814310a4>] __pci_register_driver+0x64/0x70
>> [ 24.029180] [<ffffffffa00ef860>] drm_pci_init+0xe0/0x110 [drm]
>> [ 24.029190] [<ffffffffa069a000>] ? 0xffffffffa069a000
>> [ 24.029218] [<ffffffffa069a0a0>] i915_init+0xa0/0xa8 [i915]
>> [ 24.029228] [<ffffffff810020f8>] do_one_initcall+0x88/0x1c0
>> [ 24.029238] [<ffffffff817cc999>] ? do_init_module+0x28/0x1ec
>> [ 24.029248] [<ffffffff817cc9d2>] do_init_module+0x61/0x1ec
>> [ 24.029257] [<ffffffff8111fb78>] load_module+0x2008/0x25c0
>> [ 24.029266] [<ffffffff8111b6c0>] ? m_show+0x1a0/0x1a0
>> [ 24.029278] [<ffffffff817d9a73>] ? retint_kernel+0x10/0x10
>> [ 24.029290] [<ffffffff81120256>] SyS_init_module+0x126/0x140
>> [ 24.029297] [<ffffffff817d8e32>] entry_SYSCALL_64_fastpath+0x16/0x7a
>> [ 24.030969] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
>> [ 24.031157] input: Video Bus as
>> /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input11
>> [ 24.031353] [drm] Initialized i915 1.6.0 20150522 for 0000:00:02.0 on minor 0
>> [ 24.041224] fbcon: inteldrmfb (fb0) is primary device
>>
>> Not sure which area is the root cause, so I added acpi and drm/i915 folks.
>>
>> dmesg and kernel-config are attached.
>> More infos?
>> Please let me know what you need.
>>
>> Regards,
>> - sed@ -
View attachment "dmesg_4.2.0-rc6-1-iniza-small.txt" of type "text/plain" (67492 bytes)
Download attachment "config-4.2.0-rc6-1-iniza-small" of type "application/octet-stream" (128183 bytes)
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