FYI, I was being hit by this and the issue disappeared once I updated
the firmware on those NICs to 14.31.1014. The problematic firmware
version I had was 14.26.1040. Not only did I see those errors, but I
actually saw traffic being dropped.
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I think this is a different issue you're describing, connectivity
doesn't drop with this but it becomes very flakey, large latency spikes,
etc. It would never 100% drop
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http
This seems to have taken care of it
http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=54d27365cae88fbcc853b391dcd561e71acb81fa
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Chris,
There's been a few other proposed patches, but my biggest issue now is
trying to replicate it over here before trying to look at patches, or
else there's no way for me to say "this works".
I'm working on something to try and replicate it today and I'll keep
this bug updated.. I hope it goe
There is currently a pending patch for this issue, I'll update the bug
when it lands
http://lkml.iu.edu/hypermail/linux/kernel/1505.3/01029.html
http://lkml.iu.edu/hypermail/linux/kernel/1505.3/01030.html
Thank you
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I suspect the following has occured:
https://github.com/torvalds/linux/blob/v3.16/kernel/sched/fair.c#L4829
if (!cfs_rq->nr_running)
goto idle;
put_prev_task(rq, prev);
do {
se = pick_next_entity(cfs_rq, NULL);
set_next_enti
Just wanted to add this as it might be useful (I'm trying to do
troubleshooting):
crash> dis -rl 810af2f8
/build/buildd/linux-lts-utopic-3.16.0/kernel/sched/fair.c: 4745
0x810af280 : nopl 0x0(%rax,%rax,1)
0x810af285 : push %rbp
/build/buildd/linux-lts-utopic-3
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
KVM and CFS bandwidth control causes kernel crashes (oo
Public bug reported:
We've seen this crash at least 3 times when we start setting CPU limits
using `cgroups`. It makes using CPU limits impossible, causing
instabilities in the operating system. Finally, after installing linux-
crashdump, we got a full copy of the crash message.
===
Hi,
I installed a new machine from the 14.04.2 media which gave me the HWE
stack with kernel 3.16.0-33-generic and it's running with no problems.
The machine is now loaded up to 125GB worth of VMs and with the
following memory stats:
# free -m
total used free shared
I'd just like to report in that I couldn't get it to work, it only did
after raising the limit to 256M on a server with 256GB of memory.
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Hi Chris,
Thanks for the help so far. I'm deploying a new machine right now and
I'll be trying to replicate it on -48.
The way I detected it was that i'd see messaging in "dmesg" on guest
similar to this:
hrtimer: interrupt took 4352551231 ns
In addition, when pinging the machine, you'd have
apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353454/+files/WifiSyslog.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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apport information
** Attachment removed: "BootDmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1435363/+attachment/4353426/+files/BootDmesg.txt
** Attachment removed: "CurrentDmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1435363/+attachment/4353427/+files
apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353446/+files/Lspci.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353448/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353449/+files/ProcEnviron.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353450/+files/ProcInterrupts.txt
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apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353452/+files/UdevDb.txt
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I'll be setting up a new server in the next few days, I'll attempt to
use -48 and see if that issue is present or not.
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Title:
KSM c
apport information
** Attachment added: "UdevLog.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353453/+files/UdevLog.txt
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apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353444/+files/CurrentDmesg.txt
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apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353451/+files/ProcModules.txt
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apport information
** Attachment added: "IwConfig.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353445/+files/IwConfig.txt
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apport information
** Attachment added: "Lsusb.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353447/+files/Lsusb.txt
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apport information
** Tags added: apport-collected trusty
** Description changed:
This seems to be a bug that has regressed, I have encountered the same
issue as 2 other reports:
LP: #1349897
Running kernel: 3.13.0-46-generic
This is replicated over many compute nodes (KVM) ru
apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353434/+files/UdevDb.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353432/+files/ProcInterrupts.txt
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apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353431/+files/ProcEnviron.txt
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apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353436/+files/WifiSyslog.txt
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** Attachment added: "UdevLog.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353435/+files/UdevLog.txt
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apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353427/+files/CurrentDmesg.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353430/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353429/+files/Lspci.txt
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apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353433/+files/ProcModules.txt
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** Attachment added: "IwConfig.txt"
https://bugs.launchpad.net/bugs/1435363/+attachment/4353428/+files/IwConfig.txt
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Public bug reported:
This seems to be a bug that has regressed, I have encountered the same
issue as 2 other reports:
LP: #1349897
Running kernel: 3.13.0-46-generic
This is replicated over many compute nodes (KVM) running OpenStack.
The workaround is to disable KSM:
echo 2 > /sys/kernel/mm/ksm
I am seeing the issue in 3.13.0-46-generic as well.
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Title:
Using KSM on NUMA capable machines can cause KVM guest performance and
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