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 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1707986 Title: Web Content spent more cycles on NULL pointer Status in firefox package in Ubuntu: New Bug description: 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1707986/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp