Bug 93666 - [all] circular locking dependency detected: crtc_ww_class_mutex vs dev->mode_config.mutex
Summary: [all] circular locking dependency detected: crtc_ww_class_mutex vs dev->mode_...
Status: CLOSED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: x86-64 (AMD64) Linux (All)
: highest blocker
Assignee: Matt Roper
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-01-11 10:36 UTC by Tomi Sarvela
Modified: 2017-07-24 22:43 UTC (History)
1 user (show)

See Also:
i915 platform: BDW, HSW, ILK, IVB, SNB
i915 features:

Attachments
Serial log from deadlocked testhost (54.68 KB, text/plain)
2016-01-11 10:36 UTC, Tomi Sarvela 		no flags Details
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Description Tomi Sarvela 2016-01-11 10:36:56 UTC 
Created attachment 120953 [details]
Serial log from deadlocked testhost

One of the following commits caused i915 boot deadlock with kernel configuration:
CONFIG_DEBUG_RT_MUTEXES=y
CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y

89d0d1b6f0e9c3a6b90476bd115cfe1881646fd6 drm-intel-nightly: 2016y-01m-06d-10h-37m-17s UTC integration manifest
d93c037246104e403436ffe339bcb832185d0627 drm/i915: Sanitize watermarks after hardware state readout (v4)
151268821e6f08956b28b6ff90fae187a5b230b8 drm/i915: Add extra paranoia to ILK watermark calculations
ee91a15972cc70efa4d17b4bbdb61ff314528110 drm/i915: Convert hsw_compute_linetime_wm to use in-flight state
0a8d8a8667c7e66f4fa2498be18d47f8b296b430 drm/i915: Setup clipped src/dest coordinates during FB reconstruction (v2)
c4e42196d47969a8b0df5eae734bc86c8df7cf44 drm-intel-nightly: 2016y-01m-06d-10h-07m-52s UTC integration manifest

Platforms affected:
ILK (HP Elitebook 8440p)
SNB (Lenovo X220 Tablet)
IVB (Lenovo T430s)
HSW (Brixbox, Gigabyte i5k with GT2, Dell XPS12)
BDW (Intel UltraBook, Intel NUC i7)
Comment 1 Maarten Lankhorst 2016-01-12 07:54:02 UTC 
This will be fixed by the next version of

[PATCH] drm/i915: Handle error paths during watermark sanitization properly
Comment 2 Matt Roper 2016-01-12 19:14:37 UTC 
The fix should be merged to di-nightly now; please re-open if there are still problems.

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