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Groups > linux.kernel > #1456620 > unrolled thread

problem with 731c7d3, "main drm pull request for 4.8"

Started byMike Marshall <hubcap@omnibond.com>
First post2016-08-04 20:10 +0200
Last post2016-08-08 23:30 +0200
Articles 4 — 3 participants

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  problem with 731c7d3, "main drm pull request for 4.8" Mike Marshall <hubcap@omnibond.com> - 2016-08-04 20:10 +0200
    Re: problem with 731c7d3, "main drm pull request for 4.8" Chris Wilson <chris@chris-wilson.co.uk> - 2016-08-05 11:20 +0200
      Re: problem with 731c7d3, "main drm pull request for 4.8" Mike Marshall <hubcap@omnibond.com> - 2016-08-07 00:00 +0200
        Re: problem with 731c7d3, "main drm pull request for 4.8" Dave Airlie <airlied@gmail.com> - 2016-08-08 23:30 +0200

#1456620 — problem with 731c7d3, "main drm pull request for 4.8"

FromMike Marshall <hubcap@omnibond.com>
Date2016-08-04 20:10 +0200
Subjectproblem with 731c7d3, "main drm pull request for 4.8"
Message-ID<s2vfI-4wu-7@gated-at.bofh.it>
Hi...

I've noticed the last couple of days that I can't boot
Linus' tree of the day on my VM...

I was moving backwards a day at a time to find one that would
boot so I could bisect, when I landed on 731c7d3, Dave Airlie's
"main drm pull request for 4.8" and saw "I'm down with a cold at the
moment so hopefully this isn't in too bad a state". So, instead
of bisecting, I just tried to boot both 731c7d3 and 77a8782, and
sure enough, 731c7d3 is the culprit.

My environment, where the oops happens, is a VM on a Centos
2.6.32-642.3.1.el6.x86_64. I made sure it was yum updated, so
all the kvm stuff is also up-to-date (for centos 2.6):

qemu-kvm-0.12.1.2-2.491.el6_8.1.x86_64
qemu-img-0.12.1.2-2.491.el6_8.1.x86_64
gpxe-roms-qemu-0.9.7-6.15.el6.noarch

I notice in the thread that grew from the 731c7d3 pull request on
the linux-kernel list that Linus and some others had some problems
with 731c7d3, but not the same ones I'm having.

Anywho... I hope Dave's cold gets better and that this oops is helpful.

I only subscribe to fs-devel, so please CC me on replies to this,
thanks!

-Mike

[    1.291797] [drm] Initialized drm 1.1.0 20060810
[    1.352761] [TTM] Zone  kernel: Available graphics memory: 502128 kiB
[    1.353248] [TTM] Initializing pool allocator
[    1.353660] [TTM] Initializing DMA pool allocator
[    1.355491] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000018
[    1.356038] IP: [<ffffffffa00c9875>] drm_pick_crtcs+0x125/0x280
[drm_kms_helper]
[    1.356038] PGD 0
[    1.356038] Oops: 0000 [#1] SMP
[    1.356038] Modules linked in: cirrus(+) drm_kms_helper ttm drm
i2c_core ata_generic pata_acpi
[    1.356038] CPU: 0 PID: 181 Comm: systemd-udevd Not tainted
4.7.0-00810-gc1ece76 #9
[    1.356038] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2007
[    1.356038] task: ffff880036f40000 task.stack: ffff880036fc0000
[    1.356038] RIP: 0010:[<ffffffffa00c9875>]  [<ffffffffa00c9875>]
drm_pick_crtcs+0x125/0x280 [drm_kms_helper]
[    1.356038] RSP: 0018:ffff880036fc3898  EFLAGS: 00010217
[    1.356038] RAX: ffffffffa00208f0 RBX: 0000000000000000 RCX: 0000000000001000
[    1.356038] RDX: 0000000000000000 RSI: ffffffff81c574c0 RDI: ffff880037172800
[    1.356038] RBP: ffff880036fc3900 R08: 000000000001cc90 R09: ffff880036d829f8
[    1.356038] R10: ffff88003e001c80 R11: ffff880036d829d8 R12: ffff880037172400
[    1.356038] R13: 0000000000001000 R14: ffff880037172800 R15: ffff880036d829d0
[    1.356038] FS:  00007f907d15d880(0000) GS:ffff88003fc00000(0000)
knlGS:0000000000000000
[    1.356038] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.356038] CR2: 0000000000000018 CR3: 0000000036f6d000 CR4: 00000000000006f0
[    1.356038] Stack:
[    1.356038]  0000000000000008 ffff880036d829e0 ffff880036d829d8
0000000000000001
[    1.356038]  0000000000000000 0000100000000003 ffff880036d829e0
ffff880036d829f8
[    1.356038]  0000000000000001 ffff880037172400 0000000000000001
ffff880036d829d0
[    1.356038] Call Trace:
[    1.356038]  [<ffffffffa00ca199>] drm_setup_crtcs+0x339/0xa00
[drm_kms_helper]
[    1.356038]  [<ffffffff810f78d6>] ? mark_held_locks+0x66/0x90
[    1.356038]  [<ffffffff817f2149>] ? __mutex_unlock_slowpath+0xd9/0x1a0
[    1.356038]  [<ffffffffa00caa91>]
drm_fb_helper_initial_config+0x81/0x3a8 [drm_kms_helper]
[    1.356038]  [<ffffffffa00475c6>] ? drm_modeset_unlock_all+0x66/0xc0 [drm]
[    1.356038]  [<ffffffffa0021df0>] cirrus_fbdev_init+0xa0/0xb0 [cirrus]
[    1.356038]  [<ffffffffa002148b>] cirrus_modeset_init+0x18b/0x1e0 [cirrus]
[    1.356038]  [<ffffffffa002042c>] cirrus_driver_load+0xbc/0x100 [cirrus]
[    1.356038]  [<ffffffffa0031b29>] drm_dev_register+0xa9/0xd0 [drm]
[    1.356038]  [<ffffffffa0033b0f>] drm_get_pci_dev+0x8f/0x1e0 [drm]
[    1.356038]  [<ffffffff810f7acd>] ? trace_hardirqs_on+0xd/0x10
[    1.356038]  [<ffffffffa002165d>] cirrus_pci_probe+0x9d/0xc0 [cirrus]
[    1.356038]  [<ffffffff8143bef5>] local_pci_probe+0x45/0xa0
[    1.356038]  [<ffffffff8143cf40>] ? pci_match_device+0xe0/0x110
[    1.356038]  [<ffffffff8143d311>] pci_device_probe+0xe1/0x130
[    1.356038]  [<ffffffff8152b9c4>] driver_probe_device+0x1d4/0x420
[    1.356038]  [<ffffffff8152bcf1>] __driver_attach+0xe1/0xf0
[    1.356038]  [<ffffffff8152bc10>] ? driver_probe_device+0x420/0x420
[    1.356038]  [<ffffffff815296c4>] bus_for_each_dev+0x64/0xa0
[    1.356038]  [<ffffffff8152b2be>] driver_attach+0x1e/0x20
[    1.356038]  [<ffffffff8152ac05>] bus_add_driver+0x45/0x270
[    1.356038]  [<ffffffffa008b000>] ? 0xffffffffa008b000
[    1.356038]  [<ffffffff8152c9f0>] driver_register+0x60/0xe0
[    1.356038]  [<ffffffffa008b000>] ? 0xffffffffa008b000
[    1.356038]  [<ffffffff8143b840>] __pci_register_driver+0x60/0x70
[    1.356038]  [<ffffffffa0033d40>] drm_pci_init+0xe0/0x110 [drm]
[    1.356038]  [<ffffffffa008b000>] ? 0xffffffffa008b000
[    1.356038]  [<ffffffffa008b032>] cirrus_init+0x32/0x1000 [cirrus]
[    1.356038]  [<ffffffff8100217d>] do_one_initcall+0x3d/0x160
[    1.356038]  [<ffffffff81114c62>] ? rcu_read_lock_sched_held+0x62/0x70
[    1.356038]  [<ffffffff8122e771>] ? kmem_cache_alloc_trace+0x221/0x290
[    1.356038]  [<ffffffff811bef3d>] ? do_init_module+0x27/0x1f3
[    1.356038]  [<ffffffff811bef76>] do_init_module+0x60/0x1f3
[    1.356038]  [<ffffffff8113ca2b>] load_module+0x20ab/0x2930
[    1.356038]  [<ffffffff81139760>] ? __symbol_put+0x40/0x40
[    1.356038]  [<ffffffff8113d4b6>] SYSC_finit_module+0x96/0xd0
[    1.356038]  [<ffffffff8113d50e>] SyS_finit_module+0xe/0x10
[    1.356038]  [<ffffffff817f4abc>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[    1.356038] Code: 85 5e 01 00 00 48 8b 00 48 39 d0 75 e3 49 8b 54
24 08 49 8b 86 98 02 00 00 4c 89 f7 4c 89 5d a8 48 8b 92 80 08 00 00
48 8b 40 10 <48> 83 7a 18 00 74 09 48 85 c0 0f 84 35 01 00 00 ff d0 4c
8b 5d
[    1.356038] RIP  [<ffffffffa00c9875>] drm_pick_crtcs+0x125/0x280
[drm_kms_helper]
[    1.356038]  RSP <ffff880036fc3898>
[    1.356038] CR2: 0000000000000018
[    1.382126] ---[ end trace a0dcb12aa8e9e25b ]---
[    1.382437] tsc: Refined TSC clocksource calibration: 3392.260 MHz
[    1.382832] clocksource: tsc:

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#1456965

FromChris Wilson <chris@chris-wilson.co.uk>
Date2016-08-05 11:20 +0200
Message-ID<s2Jsm-5yi-21@gated-at.bofh.it>
In reply to#1456620
On Thu, Aug 04, 2016 at 02:08:46PM -0400, Mike Marshall wrote:
> [    1.291797] [drm] Initialized drm 1.1.0 20060810
> [    1.352761] [TTM] Zone  kernel: Available graphics memory: 502128 kiB
> [    1.353248] [TTM] Initializing pool allocator
> [    1.353660] [TTM] Initializing DMA pool allocator
> [    1.355491] BUG: unable to handle kernel NULL pointer dereference
> at 0000000000000018
> [    1.356038] IP: [<ffffffffa00c9875>] drm_pick_crtcs+0x125/0x280
> [drm_kms_helper]
> [    1.356038] PGD 0
> [    1.356038] Oops: 0000 [#1] SMP
> [    1.356038] Modules linked in: cirrus(+) drm_kms_helper ttm drm
> i2c_core ata_generic pata_acpi
> [    1.356038] CPU: 0 PID: 181 Comm: systemd-udevd Not tainted
> 4.7.0-00810-gc1ece76 #9
> [    1.356038] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2007
> [    1.356038] task: ffff880036f40000 task.stack: ffff880036fc0000
> [    1.356038] RIP: 0010:[<ffffffffa00c9875>]  [<ffffffffa00c9875>]
> drm_pick_crtcs+0x125/0x280 [drm_kms_helper]
> [    1.356038] RSP: 0018:ffff880036fc3898  EFLAGS: 00010217
> [    1.356038] RAX: ffffffffa00208f0 RBX: 0000000000000000 RCX: 0000000000001000
> [    1.356038] RDX: 0000000000000000 RSI: ffffffff81c574c0 RDI: ffff880037172800
> [    1.356038] RBP: ffff880036fc3900 R08: 000000000001cc90 R09: ffff880036d829f8
> [    1.356038] R10: ffff88003e001c80 R11: ffff880036d829d8 R12: ffff880037172400
> [    1.356038] R13: 0000000000001000 R14: ffff880037172800 R15: ffff880036d829d0
> [    1.356038] FS:  00007f907d15d880(0000) GS:ffff88003fc00000(0000)
> knlGS:0000000000000000
> [    1.356038] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    1.356038] CR2: 0000000000000018 CR3: 0000000036f6d000 CR4: 00000000000006f0
> [    1.356038] Stack:
> [    1.356038]  0000000000000008 ffff880036d829e0 ffff880036d829d8
> 0000000000000001
> [    1.356038]  0000000000000000 0000100000000003 ffff880036d829e0
> ffff880036d829f8
> [    1.356038]  0000000000000001 ffff880037172400 0000000000000001
> ffff880036d829d0
> [    1.356038] Call Trace:
> [    1.356038]  [<ffffffffa00ca199>] drm_setup_crtcs+0x339/0xa00
> [drm_kms_helper]
> [    1.356038]  [<ffffffff810f78d6>] ? mark_held_locks+0x66/0x90
> [    1.356038]  [<ffffffff817f2149>] ? __mutex_unlock_slowpath+0xd9/0x1a0
> [    1.356038]  [<ffffffffa00caa91>]
> drm_fb_helper_initial_config+0x81/0x3a8 [drm_kms_helper]
> [    1.356038]  [<ffffffffa00475c6>] ? drm_modeset_unlock_all+0x66/0xc0 [drm]
> [    1.356038]  [<ffffffffa0021df0>] cirrus_fbdev_init+0xa0/0xb0 [cirrus]
> [    1.356038]  [<ffffffffa002148b>] cirrus_modeset_init+0x18b/0x1e0 [cirrus]
> [    1.356038]  [<ffffffffa002042c>] cirrus_driver_load+0xbc/0x100 [cirrus]
> [    1.356038]  [<ffffffffa0031b29>] drm_dev_register+0xa9/0xd0 [drm]

This is unlikely to be cirrus specific, but fallout from the
drm_dev_register reorganisation. Could you bisect down into that merge?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre

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#1457385

FromMike Marshall <hubcap@omnibond.com>
Date2016-08-07 00:00 +0200
Message-ID<s3hNo-2UZ-25@gated-at.bofh.it>
In reply to#1456965
Hello everyone...

I was out of the office yesterday, so I came in today to do the bisect...

# git bisect bad
c61b93fe51b1330cfc4d73084b924931bd65c8f0 is the first bad commit
commit c61b93fe51b1330cfc4d73084b924931bd65c8f0
Author: Boris Brezillon <boris.brezillon@free-electrons.com>
Date:   Tue Jun 7 13:47:56 2016 +0200

    drm/atomic: Fix remaining places where !funcs->best_encoder is valid

    Adapt drm_pick_crtcs() and update_connector_routing() to fallback to
    drm_atomic_helper_best_encoder() if funcs->best_encoder() is NULL so
    that DRM drivers can leave this hook unassigned if they know they want
    to use drm_atomic_helper_best_encoder().

    Update the vtables documentation accordingly.

    Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
    Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    Link: http://patchwork.freedesktop.org/patch/msgid/1465300095-16971-2-git-send-email-boris.brezillon@free-electrons.com

:040000 040000 e654349841a764813d619343df5c2deda93148bf
83fdb89bb101b2f8b22c001f9cc8cd47cbad097a M drivers
:040000 040000 bfd0ebacfefef860a715434678f4606fd94deb08
cc108eafc28a85299aacb9895f9a1a50e0fa78fc M include

On Fri, Aug 5, 2016 at 5:13 AM, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> On Thu, Aug 04, 2016 at 02:08:46PM -0400, Mike Marshall wrote:
>> [    1.291797] [drm] Initialized drm 1.1.0 20060810
>> [    1.352761] [TTM] Zone  kernel: Available graphics memory: 502128 kiB
>> [    1.353248] [TTM] Initializing pool allocator
>> [    1.353660] [TTM] Initializing DMA pool allocator
>> [    1.355491] BUG: unable to handle kernel NULL pointer dereference
>> at 0000000000000018
>> [    1.356038] IP: [<ffffffffa00c9875>] drm_pick_crtcs+0x125/0x280
>> [drm_kms_helper]
>> [    1.356038] PGD 0
>> [    1.356038] Oops: 0000 [#1] SMP
>> [    1.356038] Modules linked in: cirrus(+) drm_kms_helper ttm drm
>> i2c_core ata_generic pata_acpi
>> [    1.356038] CPU: 0 PID: 181 Comm: systemd-udevd Not tainted
>> 4.7.0-00810-gc1ece76 #9
>> [    1.356038] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2007
>> [    1.356038] task: ffff880036f40000 task.stack: ffff880036fc0000
>> [    1.356038] RIP: 0010:[<ffffffffa00c9875>]  [<ffffffffa00c9875>]
>> drm_pick_crtcs+0x125/0x280 [drm_kms_helper]
>> [    1.356038] RSP: 0018:ffff880036fc3898  EFLAGS: 00010217
>> [    1.356038] RAX: ffffffffa00208f0 RBX: 0000000000000000 RCX: 0000000000001000
>> [    1.356038] RDX: 0000000000000000 RSI: ffffffff81c574c0 RDI: ffff880037172800
>> [    1.356038] RBP: ffff880036fc3900 R08: 000000000001cc90 R09: ffff880036d829f8
>> [    1.356038] R10: ffff88003e001c80 R11: ffff880036d829d8 R12: ffff880037172400
>> [    1.356038] R13: 0000000000001000 R14: ffff880037172800 R15: ffff880036d829d0
>> [    1.356038] FS:  00007f907d15d880(0000) GS:ffff88003fc00000(0000)
>> knlGS:0000000000000000
>> [    1.356038] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [    1.356038] CR2: 0000000000000018 CR3: 0000000036f6d000 CR4: 00000000000006f0
>> [    1.356038] Stack:
>> [    1.356038]  0000000000000008 ffff880036d829e0 ffff880036d829d8
>> 0000000000000001
>> [    1.356038]  0000000000000000 0000100000000003 ffff880036d829e0
>> ffff880036d829f8
>> [    1.356038]  0000000000000001 ffff880037172400 0000000000000001
>> ffff880036d829d0
>> [    1.356038] Call Trace:
>> [    1.356038]  [<ffffffffa00ca199>] drm_setup_crtcs+0x339/0xa00
>> [drm_kms_helper]
>> [    1.356038]  [<ffffffff810f78d6>] ? mark_held_locks+0x66/0x90
>> [    1.356038]  [<ffffffff817f2149>] ? __mutex_unlock_slowpath+0xd9/0x1a0
>> [    1.356038]  [<ffffffffa00caa91>]
>> drm_fb_helper_initial_config+0x81/0x3a8 [drm_kms_helper]
>> [    1.356038]  [<ffffffffa00475c6>] ? drm_modeset_unlock_all+0x66/0xc0 [drm]
>> [    1.356038]  [<ffffffffa0021df0>] cirrus_fbdev_init+0xa0/0xb0 [cirrus]
>> [    1.356038]  [<ffffffffa002148b>] cirrus_modeset_init+0x18b/0x1e0 [cirrus]
>> [    1.356038]  [<ffffffffa002042c>] cirrus_driver_load+0xbc/0x100 [cirrus]
>> [    1.356038]  [<ffffffffa0031b29>] drm_dev_register+0xa9/0xd0 [drm]
>
> This is unlikely to be cirrus specific, but fallout from the
> drm_dev_register reorganisation. Could you bisect down into that merge?
> -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre

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#1458247

FromDave Airlie <airlied@gmail.com>
Date2016-08-08 23:30 +0200
Message-ID<s40hr-6Jd-1@gated-at.bofh.it>
In reply to#1457385
On 7 August 2016 at 07:59, Mike Marshall <hubcap@omnibond.com> wrote:
> Hello everyone...
>
> I was out of the office yesterday, so I came in today to do the bisect...

Okay it appears cirrus doesn't set it's mode config functions until after
it sets up modesetting, which causes this to fail.

Probably need to audit other drivers for same mistakes.

I'll send a patch later.

Dave.

>
> # git bisect bad
> c61b93fe51b1330cfc4d73084b924931bd65c8f0 is the first bad commit
> commit c61b93fe51b1330cfc4d73084b924931bd65c8f0
> Author: Boris Brezillon <boris.brezillon@free-electrons.com>
> Date:   Tue Jun 7 13:47:56 2016 +0200
>
>     drm/atomic: Fix remaining places where !funcs->best_encoder is valid
>
>     Adapt drm_pick_crtcs() and update_connector_routing() to fallback to
>     drm_atomic_helper_best_encoder() if funcs->best_encoder() is NULL so
>     that DRM drivers can leave this hook unassigned if they know they want
>     to use drm_atomic_helper_best_encoder().
>
>     Update the vtables documentation accordingly.
>
>     Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
>     Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>     Link: http://patchwork.freedesktop.org/patch/msgid/1465300095-16971-2-git-send-email-boris.brezillon@free-electrons.com
>
> :040000 040000 e654349841a764813d619343df5c2deda93148bf
> 83fdb89bb101b2f8b22c001f9cc8cd47cbad097a M drivers
> :040000 040000 bfd0ebacfefef860a715434678f4606fd94deb08
> cc108eafc28a85299aacb9895f9a1a50e0fa78fc M include
>
> On Fri, Aug 5, 2016 at 5:13 AM, Chris Wilson <chris@chris-wilson.co.uk> wrote:
>> On Thu, Aug 04, 2016 at 02:08:46PM -0400, Mike Marshall wrote:
>>> [    1.291797] [drm] Initialized drm 1.1.0 20060810
>>> [    1.352761] [TTM] Zone  kernel: Available graphics memory: 502128 kiB
>>> [    1.353248] [TTM] Initializing pool allocator
>>> [    1.353660] [TTM] Initializing DMA pool allocator
>>> [    1.355491] BUG: unable to handle kernel NULL pointer dereference
>>> at 0000000000000018
>>> [    1.356038] IP: [<ffffffffa00c9875>] drm_pick_crtcs+0x125/0x280
>>> [drm_kms_helper]
>>> [    1.356038] PGD 0
>>> [    1.356038] Oops: 0000 [#1] SMP
>>> [    1.356038] Modules linked in: cirrus(+) drm_kms_helper ttm drm
>>> i2c_core ata_generic pata_acpi
>>> [    1.356038] CPU: 0 PID: 181 Comm: systemd-udevd Not tainted
>>> 4.7.0-00810-gc1ece76 #9
>>> [    1.356038] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2007
>>> [    1.356038] task: ffff880036f40000 task.stack: ffff880036fc0000
>>> [    1.356038] RIP: 0010:[<ffffffffa00c9875>]  [<ffffffffa00c9875>]
>>> drm_pick_crtcs+0x125/0x280 [drm_kms_helper]
>>> [    1.356038] RSP: 0018:ffff880036fc3898  EFLAGS: 00010217
>>> [    1.356038] RAX: ffffffffa00208f0 RBX: 0000000000000000 RCX: 0000000000001000
>>> [    1.356038] RDX: 0000000000000000 RSI: ffffffff81c574c0 RDI: ffff880037172800
>>> [    1.356038] RBP: ffff880036fc3900 R08: 000000000001cc90 R09: ffff880036d829f8
>>> [    1.356038] R10: ffff88003e001c80 R11: ffff880036d829d8 R12: ffff880037172400
>>> [    1.356038] R13: 0000000000001000 R14: ffff880037172800 R15: ffff880036d829d0
>>> [    1.356038] FS:  00007f907d15d880(0000) GS:ffff88003fc00000(0000)
>>> knlGS:0000000000000000
>>> [    1.356038] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [    1.356038] CR2: 0000000000000018 CR3: 0000000036f6d000 CR4: 00000000000006f0
>>> [    1.356038] Stack:
>>> [    1.356038]  0000000000000008 ffff880036d829e0 ffff880036d829d8
>>> 0000000000000001
>>> [    1.356038]  0000000000000000 0000100000000003 ffff880036d829e0
>>> ffff880036d829f8
>>> [    1.356038]  0000000000000001 ffff880037172400 0000000000000001
>>> ffff880036d829d0
>>> [    1.356038] Call Trace:
>>> [    1.356038]  [<ffffffffa00ca199>] drm_setup_crtcs+0x339/0xa00
>>> [drm_kms_helper]
>>> [    1.356038]  [<ffffffff810f78d6>] ? mark_held_locks+0x66/0x90
>>> [    1.356038]  [<ffffffff817f2149>] ? __mutex_unlock_slowpath+0xd9/0x1a0
>>> [    1.356038]  [<ffffffffa00caa91>]
>>> drm_fb_helper_initial_config+0x81/0x3a8 [drm_kms_helper]
>>> [    1.356038]  [<ffffffffa00475c6>] ? drm_modeset_unlock_all+0x66/0xc0 [drm]
>>> [    1.356038]  [<ffffffffa0021df0>] cirrus_fbdev_init+0xa0/0xb0 [cirrus]
>>> [    1.356038]  [<ffffffffa002148b>] cirrus_modeset_init+0x18b/0x1e0 [cirrus]
>>> [    1.356038]  [<ffffffffa002042c>] cirrus_driver_load+0xbc/0x100 [cirrus]
>>> [    1.356038]  [<ffffffffa0031b29>] drm_dev_register+0xa9/0xd0 [drm]
>>
>> This is unlikely to be cirrus specific, but fallout from the
>> drm_dev_register reorganisation. Could you bisect down into that merge?
>> -Chris
>>
>> --
>> Chris Wilson, Intel Open Source Technology Centre

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