[libvirt-users] libvirt_lxc causes cpu 100% usage

Fri Nov 1 11:54:34 UTC 2013

I put a complete debug log here https://bugzilla.redhat.com/show_bug.cgi?id=1005570  (attement)

I created two mail threads , sorry .

======
I put some debug info here https://bugzilla.redhat.com/show_bug.cgi?id=1005570
It seems something happened in virLXCControllerConsoleUpdateWatch function,
a pipe , the write side broken, so the read side hangup which causes 100% cpu usage.

On my compute , libvirt_lxc started, 3 hours laster, this would occur . 
In early time , under normal situation ,  the debug would print informations on  newHostEvents or newContEvents ,
but then It's going to be crazy ...  no debug information on newHostEvents or newContEvents anymore ,just infinate loop.

I even could not understand what's the meaning of the code ~~  

------------------

------------------ Original ------------------
From:  "Daniel P. Berrange";<berrange at redhat.com>;
Date:  Fri, Nov 1, 2013 06:12 PM
To:  "jj"<menghuizhanguo at gmail.com>; 
Cc:  "libvirt-users"<libvirt-users at redhat.com>; 
Subject:  Re: [libvirt-users] libvirt_lxc causes cpu 100% usage

On Wed, Oct 30, 2013 at 10:50:07AM +0800, jj wrote:
> log_level = 1

> 
> under abnormal situation , the below log generated without time delay  between loops.
> 
> 2013-10-30 00:31:57.469+0000: 7566: debug : virEventPollRunOnce:638 : Poll got 1 event(s)
> 2013-10-30 00:31:57.469+0000: 7566: debug : virEventPollDispatchTimeouts:423 : Dispatch 2
> 2013-10-30 00:31:57.469+0000: 7566: debug : virEventPollDispatchHandles:468 : Dispatch 7
> 2013-10-30 00:31:57.469+0000: 7566: debug : virEventPollDispatchHandles:482 : i=0 w=1
> 2013-10-30 00:31:57.469+0000: 7566: debug : virEventPollDispatchHandles:482 : i=1 w=2
> 2013-10-30 00:31:57.469+0000: 7566: debug : virEventPollDispatchHandles:482 : i=2 w=3
> 2013-10-30 00:31:57.469+0000: 7566: debug : virEventPollDispatchHandles:482 : i=3 w=4
> 2013-10-30 00:31:57.469+0000: 7566: debug : virEventPollDispatchHandles:482 : i=4 w=5
> 2013-10-30 00:31:57.469+0000: 7566: debug : virEventPollDispatchHandles:482 : i=5 w=6
> 2013-10-30 00:31:57.470+0000: 7566: debug : virEventPollDispatchHandles:496 : EVENT_POLL_DISPATCH_HANDLE: watch=6 events=8
> 2013-10-30 00:31:57.470+0000: 7566: debug : virLXCControllerConsoleIO:974 : IO event watch=6 fd=18 events=8 fromHost=0 fromcont=1024
> 2013-10-30 00:31:57.470+0000: 7566: debug : virLXCControllerConsoleIO:1044 : Got EOF on 6 18
> 2013-10-30 00:31:57.470+0000: 7566: debug : virLXCControllerConsoleUpdateWatch:837 : Container watch 7=0 host watch 6=3
> 2013-10-30 00:31:57.470+0000: 7566: debug : virEventPollUpdateHandle:147 : EVENT_POLL_UPDATE_HANDLE: watch=7 events=0
> 2013-10-30 00:31:57.470+0000: 7566: debug : virEventPollInterruptLocked:710 : Skip interrupt, 1 1996885056
> 2013-10-30 00:31:57.470+0000: 7566: debug : virEventPollUpdateHandle:147 : EVENT_POLL_UPDATE_HANDLE: watch=6 events=3
> 2013-10-30 00:31:57.470+0000: 7566: debug : virEventPollInterruptLocked:710 : Skip interrupt, 1 1996885056
> 2013-10-30 00:31:57.470+0000: 7566: debug : virEventPollDispatchHandles:482 : i=7 w=8
> 2013-10-30 00:31:57.470+0000: 7566: debug : virEventPollCleanupTimeouts:514 : Cleanup 2
> 2013-10-30 00:31:57.471+0000: 7566: debug : virEventPollCleanupHandles:562 : Cleanup 8
> 2013-10-30 00:31:57.471+0000: 7566: debug : virEventRunDefaultImpl:270 : running default event implementation
> 2013-10-30 00:31:57.471+0000: 7566: debug : virEventPollCleanupTimeouts:514 : Cleanup 2
> 2013-10-30 00:31:57.471+0000: 7566: debug : virEventPollCleanupHandles:562 : Cleanup 8
> 2013-10-30 00:31:57.471+0000: 7566: debug : virEventPollMakePollFDs:391 : Prepare n=0 w=1, f=3 e=1 d=0
> 2013-10-30 00:31:57.471+0000: 7566: debug : virEventPollMakePollFDs:391 : Prepare n=1 w=2, f=5 e=1 d=0
> 2013-10-30 00:31:57.471+0000: 7566: debug : virEventPollMakePollFDs:391 : Prepare n=2 w=3, f=7 e=1 d=0
> 2013-10-30 00:31:57.471+0000: 7566: debug : virEventPollMakePollFDs:391 : Prepare n=3 w=4, f=9 e=1 d=0
> 2013-10-30 00:31:57.471+0000: 7566: debug : virEventPollMakePollFDs:391 : Prepare n=4 w=5, f=13 e=1 d=0
> 2013-10-30 00:31:57.472+0000: 7566: debug : virEventPollMakePollFDs:391 : Prepare n=5 w=6, f=18 e=5 d=0
> 2013-10-30 00:31:57.472+0000: 7566: debug : virEventPollMakePollFDs:391 : Prepare n=6 w=7, f=12 e=0 d=0
> 2013-10-30 00:31:57.472+0000: 7566: debug : virEventPollMakePollFDs:391 : Prepare n=7 w=8, f=14 e=1 d=0
> 2013-10-30 00:31:57.472+0000: 7566: debug : virEventPollCalculateTimeout:332 : Calculate expiry of 2 timers 
> 2013-10-30 00:31:57.472+0000: 7566: debug : virEventPollCalculateTimeout:361 : Timeout at 0 due in -1 ms
> 2013-10-30 00:31:57.472+0000: 7566: debug : virEventPollRunOnce:627 : EVENT_POLL_RUN: nhandles=7 timeout=-1

Can you provide a more complete log file for this scenario. I'd like
to see multiple cases of the virLXCControllerConsoleIO log message,
preferrably from right when the container first starts up. If the
logfile is very large, upload it somewhere rather than sending to
the list.

Also, when does this occur ? Does it happen immediately when you
start an LXC guest on mips ? Or does it only happen afer the VM
has been running for some period of time  ?

Daniel
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