It's not a problem on 15.10
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Title:
kswapd pulls server down every 2 weeks.
Status in linux package in Ubuntu:
Incomplete
Bug de
Public bug reported:
Since the generic kernel is for generic desktop use CONFIG_PREEMPT
should be set. CONFIG_NO_HZ is already there so it seems strange to me
that preempt is not especially because recommendations for desktop
system usually includes building a preemptible kernel.
ProblemType: Bug
This link shows that the in-kenrel documentation says that for a low-
latency desktop preemption is recommented.
http://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/ch09s03.html
Preemption
Systems running as servers have very different workload requirements from those
bein
Yes - 10 CPU bound tasks fighting over the CPU would perform worse with
PREEMPT. But for a desktop tha's not an issue be cause you usually
perceive "perfomance" of the system as the systems responsivene instead
of its raw computing power.
I have no raw data. I'm just experiencing that running a lo
Yes - 10 CPU bound tasks fighting over the CPU would perform worse with
PREEMPT. But for a desktop tha's not an issue be cause you usually
perceive "perfomance" of the system as the systems responsivene instead
of its raw computing power.
I have no raw data. I'm just experiencing that running a l
Agree, but that leads my attention to the fact that the lowlatency-
flavour is not linux3.13 but 3.11.
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Title:
CONFIG_PREEMPT is not
That great. Won't that happen soon? for testing purposes running 3.11
does not make much sense when 3.13 will be the final verison.
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v3.12-trusty/ seems to work for me. So to me it seem to have broken
between 3.12 and 3.13. For sure it did break since where saucy where
around christmas, because I ran that with it's lowlatency until then.
I'll try v3.13-rc1-trusty to check.
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v3.13-rc1-trusty with "threadirqs"crashes with this trace.
** Attachment added: "IMAG0515.jpg"
https://bugs.launchpad.net/ubuntu/+source/linux-lowlatency/+bug/1275116/+attachment/3988700/+files/IMAG0515.jpg
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lowlatency/+bug/1275116/+attachment/3988700/+files/IMAG0515.jpg
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Title:
lowlatency-
Yes indeed. But that sort of follows the fact that the saucy kernel - in
all version until christmas ran perfectly. That means 3.11 only. There
are 3.12 kernel at the her [1] but it does not look like they ever got
into saucy for real.
[1] http://kernel.ubuntu.com/~kernel-ppa/mainline
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If you mean v3.11.10.4-saucy then it works without problems.
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Title:
lowlatency-flavour crashes and locks up alot
Status in “linux”
v3.11.10.4-saucy + "threadirqs" works OK, but the 3.11-lowlatency that
trusty had back in January did not. This issue is getting me down as far
as managing all the different version. :)
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I don't know what changes has gone into the trusty 3.11 or 3.12 kernel.
but if I should bisect based in "threadirqs" I would make 3.12 as good
and 3.13 as bad based on my comment from yesterday :
v3.12-trusty/ seems to work for me. So to me it seem to have broken between
3.12 and 3.13. For sure
Well then it's clear. Do we have a kernel bug on this?
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Title:
lowlatency-flavour crashes and locks up alot
Status in “linux” packa
If 3.14-rc4-lowlatency is as good to set with "threadirqs" as the
generic kernel I can say that 3.14 works as a charm.
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Title:
lowla
3.13.0-16-lowlatency has no issues for me as far as I can see. At least
I virtualbox running all day - no crashes.
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Title:
lowlatenc
I've been busy, so I did not try the last versions that Joseph posted.
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Title:
lowlatency-flavour crashes and locks up alot
Status
Public bug reported:
The 3.11 flavour that where upgraded to 3.13 today crashed 10 times this
morning. I have the crashdums, but I figured that it might have been solved in
3.13. Unfortunatly it seems like it is not.
I will add crashdumps when I get crashes that do not just lockup the
machine
4,996,3231003672,-;[ cut here ]
2,997,3231003700,-;kernel BUG at
/build/buildd/linux-3.13.0/kernel/seccomp.c:449!
4,998,3231003733,-;invalid opcode: [#1] PREEMPT SMP
4,999,3231003759,c;Modules linked in: configfs ctr ccm pci_stub vboxpci(OF)
vboxnetadp(OF) vboxnetflt
After the prebvious crash I powercycled the computer and got a stall
here.
** Attachment added: "IMAG0497.jpg"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1275116/+attachment/3965079/+files/IMAG0497.jpg
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Crash during web-site access using chromium.
** Description changed:
-
- The 3.11 flavour that where upgraded to 3.13 today crashed 10 times this
morning. I have the crashdums, but I figured that it might have been solved in
3.13. Unfortunatly it seems like it is not.
+ The 3.11 flavour that w
I have tried setting up netconsole to cash what the kernel might think
is happening but wireless is not supported.
https://wiki.ubuntu.com/Kernel/Netconsole
Jaime, maybe you have a wired setup and can try to set it up?
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Jaime, are you running virtualbox or some other virtualization software?
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Title:
lowlatency-flavour crashes and locks up alot
Statu
I'm quite sure that this relates to running virtualbox - the system
crashes within 5 minuttes. Not running virtualbox does not make the
system unstable.
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Another crash
** Attachment added: "IMAG0504.jpg"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1275116/+attachment/3965840/+files/IMAG0504.jpg
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We seem some more skilled people than me on this. It seem like the error
start at one thing, but then progresses and pull the IO subsystem down
(the IO-error that I also get).
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diff --git a/boot/config-3.13.0-6-generic b/boot/config-3.13.0-6-lowlatency
index 2684575..e86aff9 100644
--- a/boot/config-3.13.0-6-generic
+++ b/boot/config-3.13.0-6-lowlatency
@@ -1,6 +1,6 @@
#
# Automatically generated file; DO NOT EDIT.
-# Linux/i386 3.13.0-6-generic Kernel Configuration
+#
The diff does not reveal any huge differences between lowlatency and
generic, but looking at it maybe others can gen an ideas as to wht might
be causing this all-over-the-place panic.
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Apparently CONFIG_IRQ_FORCED_THREADING_DEFAULT is not an upstream config
flag.
The resulting param force_irqthreads is not set no true unless
"threadirqs" are on the kernel commandline.
In the problematic kernel it is set to true by default - something that
will never happen on a vanilla kernel.
Well - nothreadirq has the effect that my virtualbox crashes. Someway
around the time where I would expect the whole system to crash.
Jaime - I thing adding "nothreadirqs" would be something that you should
try also.
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I can add that my system locked up in the end but the characteristics of
that crash was for sure different. So no real cure for me. Looking
forward to hearing what it does to your side of things.
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Problably but I just press and hold "shift" to get the bootmenu.
This I press 'e' to edit the current entry and add "nothreadirqs" to the
linux-line.
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No I'm running Ubuntu on the host system. I run Wintendo in virtualbox.
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Title:
lowlatency-flavour crashes and locks up alot
Status
I can't see it - am I looking the wrong place?
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Title:
lowlatency-flavour crashes and locks up alot
Status in “linux” package in U
But preemptiveness is the whole point of lowlatency.
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Title:
lowlatency-flavour crashes and locks up alot
Status in “linux” package
For me it for sure improves the situation. But problably my system will
crash again like Jaime. I'll leave it to die and report back in around 6
hours with the result.
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https:
The problem is NOT fixed in linux-image-3.13.0-7-lowlatency
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Title:
lowlatency-flavour crashes and locks up alot
Status in “linux”
Jospeh: Your lowlatency kernel locks up in my dual-screen configuration
at work. ;(
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Title:
lowlatency-flavour crashes and locks up
I'll try that ASAP
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Title:
lowlatency-flavour crashes and locks up alot
Status in “linux” package in Ubuntu:
Confirmed
Bug descr
Same thing. Running virtual box and loading both host and guest system
100% crashes the system.
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Title:
lowlatency-flavour crashes a
Yeah - I experience most crashes when virtualbox is running.
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Title:
lowlatency-flavour crashes and locks up alot
Status in “linux”
That's right. So maybe I'm no experiencing the same problem as you.
Nevertheless the crashdumps we posted in the beginning looked
similar... so I don't know.
Have you tried running virtualbox with some cpu load on both host and
guest os? nothreadirqs did make a difference in the time it took b
.13.0-8-lowlatency crashes for me.
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Title:
lowlatency-flavour crashes and locks up alot
Status in “linux” package in Ubuntu:
Conf
That's a VERY good idea. I mean if you have an issue in virtualbox then
everyone will have that same issue.
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Title:
lowlatency-flavo
v3.14-rc2-trusty also crashes.
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Title:
lowlatency-flavour crashes and locks up alot
Status in Virtualbox:
New
Status in “linux” p
@Joseph thats problably correct. I won't need virtualbox tomorrow. So I
will uninstall it and use the latest lowlatency kernel and report back.
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Oh welll I can now conclude that my system can lock during boot
like in #5. And that even if virtual box is not at all installed.
So virtualbox clearly pushes thing, but the preempt-stuff can tip by
itself also.
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Well ... virtualbox (and virtualbox-dkms) is uninstalled. Soe the
modules are simply not there anymore.
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Title:
lowlatency-flavour c
Yes - I ran 13.10 from august 2013 until december 2013 with no issues at
all.
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Title:
lowlatency-flavour crashes and locks up alot
The version that was in 13.10 at that time - problably 3.11-lowlatency.
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Title:
lowlatency-flavour crashes and locks up alot
Status
** Attachment added: "Crash with 3.13.0-8-generic #28 booted with "threadirqs""
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1275116/+attachment/3980047/+files/IMAG0510.jpg
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Great suggestion. It crashes 4 out of 5 boots for me. All of them with
simmilar lock during some systemd-udev thing and a stuck CPU.
** Attachment added: "Crash with 3.13.0-8-generic #28 booted with "threadirqs""
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1275116/+attachment/3980049
My new attachment is btw. created with the virtualbox driver out of the
way just to be sure.
https://launchpadlibrarian.net/166218408/IMAG0510.jpg
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Welll I removed "splash" and "quiet" to be able to see what is
going on and then added "threadirqs".
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Title:
lowlatency-flavour
3.13.0-9.29 and well as 3.13.0-10 contains this change
[Config] lowlatency -- turn CONFIG_IRQ_FORCED_THREADING_DEFAULT off
temporarily
I wonder if Andy Witcroft could add a comment wheather it relates to
this bug.
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For what it's worth running virtualbox I'm seeing the following.
* NO CRASH with generic kernel.
* CRASH with generic kernel with "threadirqs".
* NO CRASH with latest lowlatency kernel. Running 3 hours now. With previous
lowlatency kernel a crash would happen within minutes..
* CRASH wqith previo
Public bug reported:
in 15.04 even when having plenty of RAM and swap kswpd uses lots of CPU
and might bring the machine down to a crawl making is unable to access
it over the network.
I say "might", because it's only a very clear feeling that I have. I do
not know it for sure.
Anyway the fact i
It happenend after upgrading to 15.04
For some reason the system still used kernel 3.13 after the upgrade - on which
it failed. Upgrading to 3.19 did not change anything.
I have difficulties believing that and userspace sutff could cause it, but
maybe
the systemd-stuff could affect it anyhow.
On one of the machine suffering from this I run jenkins. Shutting down
jenkins immediately gets kswapd back to normal. Starting jenkins again
makes kswapd spin again. But a reboot mitigates the problem for several
days.
I'll keep investigating this.
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After a couple of days with linxu 4.8.0 the problems are seems to be
gone. I just hope that it is an effect of a real change and not a timing
issue.
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bhat3 - I'm seeing the problem after upgrading to current 16.10. What do
you wan't me to try out on my system to track down the bug?
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LEt me pull that statement back. It fail on lowlatency too - just not
every time.
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Title:
[Lenovo ThinkPad T430s 2356] Unable to wak
Public bug reported:
When entering sleep mode like this
# echo mem > /sys/power/state
my system is unable to wake up again. It tries to wake up - the WLAN led
lights up but nothing else happenens.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.10.0-5-generic 3.10.0-5.14
Pr
Good point about the BIOS update. Actually wake-up worked around 1 month
ago on one of the earlier 3.10 kernels.
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Title:
[Lenovo Thi
and 3.10.0-5-generic still fails. So something is clearly a bit fishy.
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Title:
[Lenovo ThinkPad T430s 2356] Unable to wake up after
Hmm ... it works now with 3.10.0-5-lowlatency
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Title:
[Lenovo ThinkPad T430s 2356] Unable to wake up after suspend
Status in “l
It's no longer an issue.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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Title:
nouveau-driver sets LVDS backlig
I'm very sure that it happens to every 15.04 system running continuously
24/7. BUT it seem to be very much related to the java-stuff involved in
running Jenkins or a TeamCity agent (as with the actual affected
system).
I have not upgraded the BIOS yet - and I do not think that it could
affect it.
Look at the this graph
http://sgh.dk/~sgh/cpustat_month.png
This is a machine that it not doing anything cpu intensive.
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Title:
ks
Upstream kernel bug
https://bugzilla.kernel.org/show_bug.cgi?id=99471
** Bug watch added: Linux Kernel Bug Tracker #99471
http://bugzilla.kernel.org/show_bug.cgi?id=99471
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