Public bug reported: Starting with ppa kernel 4.7-rc5, we can observe thousands of kworker processes (as shown by "ps aux | grep -c kworker"). Because of this, system is sometimes not very responsive, or system load goes up to 100, 200 and more.
This can be easily reproduced by installing the kernel and booting it. Below a table showing the number of kworker processes right after boot: kernel version | kworker count after boot ------------------------------------------- 4.6.3 37 4.6.4 47 4.6.5 46 4.6.6 49 4.6.7 49 4.7.0-rc1-yakkety 46 4.7.0-rc2-yakkety 49 4.7.0-rc3-yakkety 45 4.7.0-rc4-yakkety 47 4.7.0-rc5-yakkety 1592 4.7.0-rc6-yakkety 1714 4.7.0-rc7-yakkety 1955 4.7.0 2088 4.7.1 1222 4.7.2 1699 4.7.3 1446 4.7.4 1781 4.8-rc1 (not tested) 4.8-rc2 2012 4.8-rc3 1696 4.8-rc4 1210 4.8-rc5 1890 4.8-rc6 1657 4.8-rc7 1647 As you can see, the issue started with ppa kernel 4.7.0-rc5 I've tried to debug it and it looks it's some regression introduced in the config file. If we take config-4.7.0-040700rc4-generic (from http://kernel.ubuntu.com /~kernel-ppa/mainline/v4.7-rc4-yakkety/linux- image-4.7.0-040700rc4-generic_4.7.0-040700rc4.201606201235_amd64.deb), and build any later kernel - we don't observe thousands of kworker processes. If we use the config from 4.7.0-rc5-yakkety and build any later kernel, it results in thousands of kworker processes. ** Affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1627466 Title: thousands of kworker processes with 4.7.x and 4.8-rc* ppa kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1627466/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
