[Bug 1707986] [NEW] Web Content spent more cycles on NULL pointer

[asu]

Public bug reported:

For this test run kernel 4.6.2 modiffied.
1.Run from terminal sudo perf record -ag when firefox running on youtube
2. Stop perf process and read the result, result is belllow:

Samples: 26K of event 'cycles:p', Event count (approx.): 9427386496                                              
  Children      Self  Command          Shared Object                   Symbol                                    
+    9.06%     0.00%  Web Content      [unknown]                       [.] 0000000000000000
+    5.29%     0.00%  Web Content      [unknown]                       [.] 0x0000000000841f0f
+    3.86%     0.00%  Web Content      libxul.so                       [.] 0xffff80a98562dc70
+    3.03%     0.00%  Web Content      libxul.so                       [.] 0xffff80a9855affd0

On most time access on NULL pointer  or unknown symbol.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox (not installed)
Uname: Linux 4.6.2+ x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Aug  1 21:07:17 2017
InstallationDate: Installed on 2016-04-29 (459 days ago)
InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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Title:
  Web Content spent more cycles on NULL pointer

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