[Bug 110868] New: firefox randomly hangs after commit 754a254427

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110868

            Bug ID: 110868
           Summary: firefox randomly hangs after commit 754a254427
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisected
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: belyshev at depni.sinp.msu.ru
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: chris at chris-wilson.co.uk,
                    intel-gfx-bugs at lists.freedesktop.org

Created attachment 144489
  --> https://bugs.freedesktop.org/attachment.cgi?id=144489&action=edit
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 at 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.

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