RE: [Xen-devel] Re: BUG: soft lockup detected on CPU#0! on 3.0.2-2

["Ye, Yuanqing" <yuanqing.ye@xxxxxxxxx>]

I also meet this bug when booting up Linux guest OS VMX domain.
But if boot up Linux guest OS with kernel parameter "quiet", it can boot up 
successfully.

Best Regards
Larry
 

-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of john maclean
Sent: 2006年11月2日 22:50
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Re: BUG: soft lockup detected on CPU#0! on 3.0.2-2


Keir Fraser <Keir.Fraser <at> cl.cam.ac.uk> writes:

> 
> On 16/9/06 2:34 am, "Luke Crawford" <lsc <at> prgmr.com> wrote:
> 
> > completely unpingable.  console was also dead, nobody tried the xen
> > console.  (I just setup a better reboot procedure for my hosting company;
> > I need to setup something similar here so that we don't loose the data we
> > need to figure this out.)
> > 
> > Where should I start looking to find out exactly what "bug: soft lockup on
> > cpu0" means?  linux source/docs?  or Xen source/docs?
> 
> The watchdog code runs a kernel thread on every CPU. This is supposed to
> wake up every second and update a per-CPU counter. A hook from the timer
> interrupt checks the per-CPU counter and prints a softlockup warning if the
> counter is not updated for 10 seconds.
> 
> 3.0.2-2 is known to be susceptible to softlockups because the Xen scheduler
> will starve domains to run domain0. It's not clear if that's what is
> happening here, but you need to repro on tip of xen-3.0-testing to find out
> one way or the other. Because of the number of bug fixes since 3.0.2-3 we
> don't recommend running any old releases of 3.0.2.
> 
>  -- Keir
> 


I also get soft lockup warnings in my Xen domU. I'd really love to be able to
determine the source of the error(s) and perhaps fix them myself. Not a kernel
hacker and my C is rather flaky but can anyone point me to some docs one how ti
interpret data from:-

Pausing... 5<3>BUG: soft lockup detected on CPU#0!

Pid: 1, comm:                 init
EIP: 0061:[<c0107c64>] CPU: 0
EIP is at delay_tsc+0x14/0x20
 EFLAGS: 00000287    Not tainted  (2.6.16-xen #1)
 EAX: 79d31a46 EBX: 000c74e4 ECX: 79c788c9 EDX: 00004616
 ESI: 00000005 EDI: c0112520 EBP: bff6c010 DS: 007b ES: 007b
 CR0: 8005003b CR2: 431ea00c CR3: 003e3000 CR4: 00000640
  [<c011264d>] do_fixup_4gb_segment+0x12d/0x160
  [<c0113fa0>] do_page_fault+0x4a0/0x7ac
   [<c03de17c>] icmp_init+0xdc/0x110
 [<c03de284>] inet_init+0x74/0x380
[<c03de17c>] icmp_init+0xdc/0x110
[<c0105243>] error_code+0x2b/0x30
Continuing...

Are there any local docs, tools or dirs (on my machine) or URLs that anyone can
point me to?

 - jm



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