Bug 95045 - Driver randomly hangs in sna_wait_vblank()
Summary: Driver randomly hangs in sna_wait_vblank()
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Chris Wilson
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-04-20 22:48 UTC by Mikołaj Siedlarek
Modified: 2016-04-20 23:19 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments
log from Xorg initialization (41.32 KB, text/plain)
2016-04-20 22:48 UTC, Mikołaj Siedlarek 		no flags Details
trace from GDB (7.93 KB, text/plain)
2016-04-20 22:49 UTC, Mikołaj Siedlarek 		no flags Details
View All

Description Mikołaj Siedlarek 2016-04-20 22:48:33 UTC 
Created attachment 123102 [details]
log from Xorg initialization

Machine: Apple MacBook Pro Retina 10.1
OS: Linux 4.5.1-1-ARCH #1 SMP PREEMPT x86_64 GNU/Linux
Graphics: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09)
Xorg Server: 1.18.3
Xorg Intel Driver: 2.99.917 (commit f2a4645)

Xorg randomly and permanently hangs in Intel driver using SNA on my machine,
with main thread eating up 100% of one CPU core. Couple of semi-random manual
breaks in a debugger show the driver spending all of this time in sna_wait_vblank()
function.

Mouse cursor also freezes if that matters - I saw people posting this in their
bug reports.

I'm attaching:
- backtrace from GDB
- log from Xorg initialization (rest of the log was from libinput, so I cut it out)
Comment 1 Mikołaj Siedlarek 2016-04-20 22:49:05 UTC 
Created attachment 123103 [details]
trace from GDB
Comment 2 Chris Wilson 2016-04-20 23:19:17 UTC 
commit 29b70ccdf67ee7afa19bed26de8678476ba94f6e
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Sun Apr 17 15:02:46 2016 +0100

    sna/present: Fix requeuing after interrupting TearFree

commit 562ae1f29fd4946c5204bacc9eaa4ee13e809753
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Mon Apr 18 20:56:05 2016 +0100

    sna/present: Postpone recursed vblank during TearFree by 1ms

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