*** This bug is a duplicate of bug 1626564 ***
https://bugs.launchpad.net/bugs/1626564
This particular bug has already been reported and is a duplicate of bug
1626564, so it is being marked as such. Please look at the other bug
report to see if there is any missing information that you can provide,
or to see if there is a workaround for the bug. Additionally, any
further discussion regarding the bug should occur in the other report.
** This bug has been marked a duplicate of bug 1626564
4.8 regression: SLAB is being used instead of SLUB
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https://bugs.launchpad.net/bugs/1627466
Title:
thousands of kworker processes with 4.7.x and 4.8-rc* ppa kernel
Status in linux package in Ubuntu:
Incomplete
Bug description:
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.
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