https://bugs.freedesktop.org/show_bug.cgi?id=72782
--- Comment #21 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #20)
> Today's mainline kernel (top commit 85ce70fdf48aa290b4845311c2dd815d7f8d1fa5)
>
> [ 241.352344] INFO: task systemd-udevd:381 blocked for more than 120
> seconds.
> [ 241.352420] Tainted: PF O 3.13.0-3-generic #18-Ubuntu
> [ 241.352474] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> this message.
> [ 241.352532] systemd-udevd D f4fd7a24 0 381 270 0x00000004
> [ 241.352552] f4fd7a4c 00000086 c12f0573 f4fd7a24 c18294f8 c1a7c780
> 00000001 00000001
> [ 241.352582] c1a7c780 f5858000 f68a0d00 0003d1d6 00000000 f4fd7a1c
> f86e97df 1b762573
> [ 241.352608] f86e97e1 f86e97e1 f86ee998 f4fd7a60 c12f29dc 00000001
> 00000000 0000ff02
> [ 241.352635] Call Trace:
> [ 241.352663] [<c12f0573>] ? format_decode+0x323/0x390
> [ 241.352708] [<c12f29dc>] ? vsnprintf+0x2cc/0x3d0
> [ 241.352728] [<c12f0001>] ? put_dec_trunc8+0x61/0xa0
> [ 241.352750] [<c16415a3>] schedule_preempt_disabled+0x23/0x60
> [ 241.352766] [<c1642eed>] __mutex_lock_slowpath+0x10d/0x171
> [ 241.352782] [<c164241c>] mutex_lock+0x1c/0x28
> [ 241.352910] [<f8d93aa2>] intel_get_load_detect_pipe+0x152/0x3a0 [i915]
> [ 241.353059] [<f8dc3142>] ? gen4_read32+0x32/0xb0 [i915]
> [ 241.353075] [<c12f2b6a>] ? snprintf+0x1a/0x20
> [ 241.353195] [<f8d9516d>] intel_modeset_setup_hw_state+0xa7d/0xae0 [i915]
> [ 241.353273] [<f86cffd8>] ? drm_mode_config_reset+0x98/0xb0 [drm]
> [ 241.353392] [<f8d951fe>] intel_modeset_gem_init+0x2e/0x40 [i915]
> [ 241.353490] [<f8d5abfb>] i915_driver_load+0xb3b/0xdc0 [i915]
> [ 241.353586] [<f8d57e10>] ? i915_switcheroo_set_state+0xa0/0xa0 [i915]
> [ 241.353706] [<f86cbcab>] drm_dev_register+0x8b/0x1a0 [drm]
> [ 241.353768] [<f86cd78e>] drm_get_pci_dev+0x7e/0x120 [drm]
> [ 241.353797] [<c11d8e37>] ? sysfs_do_create_link_sd.isra.2+0xa7/0x1c0
> [ 241.353897] [<f8d575ea>] i915_pci_probe+0x3a/0x80 [i915]
> [ 241.353918] [<c132870f>] pci_device_probe+0x6f/0xc0
> [ 241.353934] [<c11d8f75>] ? sysfs_create_link+0x25/0x40
> [ 241.353956] [<c13faf65>] driver_probe_device+0x105/0x380
> [ 241.353972] [<c1328662>] ? pci_match_device+0xb2/0xc0
> [ 241.353992] [<c13fb291>] __driver_attach+0x71/0x80
> [ 241.354008] [<c13fb220>] ? __device_attach+0x40/0x40
> [ 241.354026] [<c13f93c7>] bus_for_each_dev+0x47/0x80
> [ 241.354043] [<c13fa9ce>] driver_attach+0x1e/0x20
> [ 241.354057] [<c13fb220>] ? __device_attach+0x40/0x40
> [ 241.354072] [<c13fa627>] bus_add_driver+0x157/0x230
> [ 241.354093] [<c13fb859>] driver_register+0x59/0xe0
> [ 241.354111] [<c10487a0>] ? __set_pmd_pte+0xa0/0xa0
> [ 241.354130] [<c1327142>] __pci_register_driver+0x32/0x40
> [ 241.354191] [<f86cd925>] drm_pci_init+0xf5/0x100 [drm]
> [ 241.354223] [<f8655000>] ? 0xf8654fff
> [ 241.354316] [<f865505e>] i915_init+0x5e/0x60 [i915]
> [ 241.354333] [<c1002122>] do_one_initcall+0xd2/0x190
> [ 241.354352] [<c10e94f8>] ? tracepoint_module_notify+0x118/0x180
> [ 241.354372] [<f8655000>] ? 0xf8654fff
> [ 241.354389] [<c1049daf>] ? set_memory_nx+0x5f/0x70
> [ 241.354411] [<c16393ee>] ? set_section_ro_nx+0x54/0x59
> [ 241.354432] [<c10c210a>] load_module+0x111a/0x18e0
> [ 241.354464] [<c10c2a35>] SyS_finit_module+0x75/0xc0
> [ 241.354481] [<c11374cb>] ? vm_mmap_pgoff+0x7b/0xa0
> [ 241.354513] [<c164b90d>] sysenter_do_call+0x12/0x28
>
> I'll test the drm-intel-nightly next
For reference that looks to be fixed with
commit 7ad228b11ec26a820291c9f5a1168d6176580dc1
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date: Tue Jan 7 16:15:36 2014 +0200
drm/i915: Don't grab crtc mutexes in intel_modeset_gem_init()
When the pipe A force quirk is applied the code will attempt to grab
a crtc mutex during intel_modeset_setup_hw_state(). If we're already
holding all crtc mutexes this will obviously deadlock every time.
So instead of using drm_modeset_lock_all() just grab the
mode_config.mutex. This is enough to avoid the unlocked mutex warnings
from certain lower level functions.
The regression was introduced in:
commit 027476642811f8559cbe00ef6cc54db230e48a20
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date: Mon Dec 2 11:08:06 2013 +0200
drm/i915: Take modeset locks around intel_modeset_setup_hw_state()
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: stable at vger.kernel.org
[danvet: Add cc: stable since the offending commit has that, too.]
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
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