*** This bug is a duplicate of bug 1637520 ***
https://bugs.launchpad.net/bugs/1637520
** This bug has been marked a duplicate of bug 1637520
Yakkety update to v4.8.5 stable release
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I built a test kernel with the proposed patch from upstream. The test kernel
can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/upstream/
Can you test this kernel and see if it resolves this bug?
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That's correct, that dump_buggy is without stress running.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage
>From Upstream:
"> Here is the dump before stress is started:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627108/+attachment/4760437/+files/dump_nonbuggy
This one is ok.
The dump indicates Sched Debug Version: v0.11, 4.8.0-11-generic
#12~lp1627108Commit3d30544Reverted
so this is
** Attachment added: "dump_buggy"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627108/+attachment/4760436/+files/dump_buggy
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Title:
I have attached two dumps. One with the buggy kernel and the other with
the kernel that does not show the lag.
** Attachment added: "dump_nonbuggy"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627108/+attachment/4760437/+files/dump_nonbuggy
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Update and request from upstream:
"I have looked at the dump and there is something very odd for
system.slice task group where the display manager is running.
system.slice->tg_load_avg is around 381697 but tg_load_avg is
normally equal to Sum of system.slice[cpu]->tg_load_avg_contrib
whereas Sum
I tested the kernel tip from your debs and the issue is very much alive.
Here is the requested dump: http://paste.ubuntu.com/23312351/
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Title:
Upstream also requested testing of the following repo:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
I built a test kernel with this tree. It can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/upstream/
Can you test this kernel and see if it exhibits the bug or
The patch author requested that we provide a /proc/sched_debug dump
while the issue is happening. Can you collect that data?
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Title:
X1Carbon
As notified on on IRC, that is a good kernel.
The issue is easy to reproduce on an X1 Carbon just run `stress -c 4`
and within a few seconds mouse starts to lag and everything becomes
slow.
** Description changed:
My X1Carbon becomes quite laggy, the cursor hangs for a few seconds and
then
I built a Yakkety test kernel with a revert of commit
3d30544f02120b884bba2a9466c87dba980e3be5. The test kernel can be
downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/
Can you test that kernel and report back if it has the bug or not?
Note with this kernel, you need to install
The bisect reported this as the first bad commit:
commit 3d30544f02120b884bba2a9466c87dba980e3be5
Author: Peter Zijlstra
Date: Tue Jun 21 14:27:50 2016 +0200
sched/fair: Apply more PELT fixes
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I built the next test kernel, up to the following commit:
7dc603c9028ea5d4354e0e317e8481df99b06d7e
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/7dc603c9028ea5d4354e0e317e8481df99b06d7e
Can you test that kernel and report back if it has the bug or not? I
As reported on IRC, that's a bad kernel.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage notifications about this bug
I built the next test kernel, up to the following commit:
3d30544f02120b884bba2a9466c87dba980e3be5
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/3d30544f02120b884bba2a9466c87dba980e3be5
Can you test that kernel and report back if it has the bug or not? I
FTR, I tested #29 which works for Omer, but not for me, so bug 1626436
is not a duplicate.
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Title:
X1Carbon comes to a crawl during high CPU
I built the next test kernel, up to the following commit:
ea86cb4b7621e1298a37197005bf0abcc86348d4
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/ea86cb4b7621e1298a37197005bf0abcc86348d4
Can you test that kernel and report back if it has the bug or not? I
Ok, the one is comment 28 is bad, while the one in #29 is Good.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage
If that kernel is also bad, then the next one is already ready and can
be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/3d89e5478bf550a50c99e93adf659369798263b0/
However, if it is good, I'll have to build the next kernel with a good
result.
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I pointed you to the wrong kernel in comment #26. The URL should have
been:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/55e16d30bd99510900caec913c90f53bc2b35cba/
Can you test that kernel?
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Thanks, that's a bad kernel.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage notifications about this bug go to:
I built the next test kernel, up to the following commit:
55e16d30bd99510900caec913c90f53bc2b35cba
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/766fd5f6cdaf1d558afba19850493b2603c9625d
Can you test that kernel and report back if it has the bug or not? I
That is a bad kernel.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage notifications about this bug go to:
I built the next test kernel, up to the following commit:
766fd5f6cdaf1d558afba19850493b2603c9625d
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/766fd5f6cdaf1d558afba19850493b2603c9625d
Can you test that kernel and report back if it has the bug or not? I
I built the next test kernel, up to the following commit:
3ebfd81f7fb3e81a754e37283b7f38c62244641a
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108/3ebfd81f7fb3e81a754e37283b7f38c62244641a
Can you test that kernel and report back if it has the bug or not? I
That's a good kernel build. Seems there are multiple builds in there, so
I tested 201610061038 which is newer.
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Title:
X1Carbon comes to a crawl
I built the next test kernel, up to the following commit:
c86ad14d305d2429c3da19462440bac50c183def
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
Hi! That is a bad kernel, i.e. it contains the regression.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage
I built the next test kernel, up to the following commit:
0f657262d5f99ad86b9a63fb5dcd29036c2ed916
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
To add the missing comment, I tried that last kernel last night and that
is a good one as well. I notified Joseph on IRC.
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Title:
X1Carbon comes
I filed bug 1626436 which is similar; I wanted to try
http://kernel.ubuntu.com/~jsalisbury/lp1627108 but that is empty?
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Title:
X1Carbon comes
I built the next test kernel, up to the following commit:
5048c2af078d5976895d521262a8802ea791f3b0
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
Ok, that is a good kernel. My test is `stress -c 4` and it works fine
i.e. system performance does not degrade.
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Title:
X1Carbon comes to a
I built the next test kernel, up to the following commit:
52770c37db2c0ee5585dae2de3d19c8453f1e8dc
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
Same results. This build is infected as well.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage notifications about this
I built the next test kernel, up to the following commit:
55392c4c06204c8149dc09cf474691f1cc3c
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
Tested, the latest kernel build that you provided is bad as well.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage
I built the next test kernel, up to the following commit:
f7816ad0f878dacd5f0120476f9b836ccf8699ea
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1627108
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
Omer reports the first test kernel is bad on IRC.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage notifications about
I started a kernel bisect between v4.7 final and v4.8-rc1. The kernel
bisect will require testing of about 7-10 test kernels.
I built the first test kernel, up to the following commit:
1c88e19b0f6a8471ee50d5062721ba30b8fd4ba9
The test kernel can be downloaded from:
I tried linux 4.8-rc1 and it does have the said regression.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage
Can you give the v4.8-rc1 kernel a try? It can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8
We can perform a kernel bisect, once we know the last good kernel and
first bad one.
** Changed in: linux (Ubuntu Yakkety)
Assignee: (unassigned) => Joseph Salisbury
So I tested linux 4.8 final and the regression still exists. On another
note I also tested linux 4.7 and the issue does not exist there.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu Yakkety)
Status: Incomplete => Confirmed
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Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.8 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix
Confirming, downgrading to 4.4 fixes the issue.
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Title:
X1Carbon comes to a crawl during high CPU usage tasks
To manage notifications about
** Tags added: kernel-4.8
** Changed in: linux (Ubuntu)
Importance: Undecided => High
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Title:
X1Carbon comes to a crawl during high CPU
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