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

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