Re: 4.4: INFO: rcu_sched self-detected stall on CPU

From	Steven Haigh <netwiz@crc.id.au>
Newsgroups	linux.kernel
Subject	Re: 4.4: INFO: rcu_sched self-detected stall on CPU
Date	2016-03-25 22:10 +0100
Message-ID	<rgH9v-7F2-3@gated-at.bofh.it> (permalink)
References	(1 earlier) <rgz2i-1z4-25@gated-at.bofh.it> <rgAB4-2Mv-19@gated-at.bofh.it> <rgBdM-339-13@gated-at.bofh.it> <rgCtb-4bi-15@gated-at.bofh.it> <rgCMx-4r7-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 26/03/2016 3:20 AM, Boris Ostrovsky wrote:
> On 03/25/2016 12:04 PM, Steven Haigh wrote:
>> It may not actually be the full logs. Once the system gets really upset,
>> you can't run anything - as such, grabbing anything from dmesg is not
>> possible.
>>
>> The logs provided above is all that gets spat out to the syslog server.
>>
>> I'll try tinkering with a few things to see if I can get more output -
>> but right now, that's all I've been able to achieve. So far, my only
>> ideas are to remove the 'quiet' options from the kernel command line -
>> but I'm not sure how much that would help.
>>
>> Suggestions gladly accepted on this front.
> 
> You probably want to run connected to guest serial console ("
> serial='pty' " in guest config file and something like 'loglevel=7
> console=tty0 console=ttyS0,38400n8' on guest kernel commandline). And
> start the guest with 'xl create -c <cfg>' or connect later with 'xl
> console <domainID>'.

Ok thanks, I've booted the DomU with:

$ cat /proc/cmdline
root=UUID=63ade949-ee67-4afb-8fe7-ecd96faa15e2 ro enforcemodulesig=1
selinux=0 fsck.repair=yes loglevel=7 console=tty0 console=ttyS0,38400n8

I've left a screen session attached to the console (via xl console) and
I'll see if that turns anything up. As this seems to be rather
unpredictable when it happens, it may take a day or two to get anything.
I just hope its more than the syslog output :)

-- 
Steven Haigh

Email: netwiz@crc.id.au
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897

Thread

4.4: INFO: rcu_sched self-detected stall on CPU Steven Haigh <netwiz@crc.id.au> - 2016-03-25 04:10 +0100
  Re: [Xen-devel] 4.4: INFO: rcu_sched self-detected stall on CPU Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-03-25 13:30 +0100
    Re: [Xen-devel] 4.4: INFO: rcu_sched self-detected stall on CPU Steven Haigh <netwiz@crc.id.au> - 2016-03-25 15:10 +0100
      Re: [Xen-devel] 4.4: INFO: rcu_sched self-detected stall on CPU Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-03-25 15:50 +0100
        Re: [Xen-devel] 4.4: INFO: rcu_sched self-detected stall on CPU Steven Haigh <netwiz@crc.id.au> - 2016-03-25 17:10 +0100
          Re: [Xen-devel] 4.4: INFO: rcu_sched self-detected stall on CPU Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-03-25 17:30 +0100
            Re: 4.4: INFO: rcu_sched self-detected stall on CPU Steven Haigh <netwiz@crc.id.au> - 2016-03-25 22:10 +0100
              Re: 4.4: INFO: rcu_sched self-detected stall on CPU Steven Haigh <netwiz@crc.id.au> - 2016-03-29 11:00 +0200
                Re: 4.4: INFO: rcu_sched self-detected stall on CPU Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-03-29 16:20 +0200
                Re: 4.4: INFO: rcu_sched self-detected stall on CPU Steven Haigh <netwiz@crc.id.au> - 2016-03-29 19:50 +0200
                Re: 4.4: INFO: rcu_sched self-detected stall on CPU Steven Haigh <netwiz@crc.id.au> - 2016-03-29 20:10 +0200
                Re: 4.4: INFO: rcu_sched self-detected stall on CPU Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-03-30 15:50 +0200
                Re: 4.4: INFO: rcu_sched self-detected stall on CPU Steven Haigh <netwiz@crc.id.au> - 2016-04-02 04:00 +0200

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