Bug 110868

Summary: firefox randomly hangs after commit 754a254427
Product: DRI Reporter: Serge Belyshev <belyshev>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED NOTOURBUG QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: chris, intel-gfx-bugs
Version: DRI gitKeywords: bisected
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
full dmesg output with drm.debug=0xe none

Description Serge Belyshev 2019-06-09 23:59:28 UTC 
Created attachment 144489 [details]
full dmesg output with drm.debug=0xe

Since 5.1-rc1 mainline linux kernel release, webpage contents in firefox hang randomly.  Hangs are non-fatal and "fixable" with alt-tab keypress or an elevated background system load.

I have bisected this issue to the commit 754a254427:

commit 754a25442705c4f90e0d05f1a7bd303ffe700ca9
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu Mar 21 16:19:08 2019 +0000

    drm/i915: Skip object locking around a no-op set-domain ioctl


I have verified that this issue still present in both current Linus' tree and drm-tip.  Reverting the commit fixes the problem.

Steps to reproduce:
1. Launch firefox (tested versions 66 and 67), open any long webpage with vertical scrollbar.
2. Scroll the page until it becomes stuck.

(hangs can also happen on pages without scrollbar, it is just easier to notice)

Problem is always reproducible after few attempts.

System information:
uname -m: x86_64
uname -r: 5.2.0-rc3-00948-g999689d568a8-dirty (aka current drm-tip with an unrelated local change)
system: Debian sid
hardware: Xiaomi mi notebook air 12"; Timi TM1612/TM1612, BIOS A04 08/06/2016
display connector: eDP
full dmesg is attached.
Comment 1 Chris Wilson 2019-06-10 00:20:49 UTC 
That is a userspace bug.
Comment 2 Lakshmi 2019-06-13 07:24:31 UTC 
Closing as NOTOURBUG.

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