Re: [Xen-devel] crash in csched_load_balance after xl vcpu-pin

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Wed, 2018-04-11 at 14:45 +0200, Olaf Hering wrote:
> On Wed, Apr 11, Dario Faggioli wrote:
> 
> > If you're interested in figuring out, I'd like to see:
> > - full output of `xl info -n'
> > - output of `xl debug-key u'
> > - xl vcpu-list
> > - xl list -n
> 
> Logs for this .cfg attached:
> 
> name='fv_sles12sp1.0'
> vif=[ 'mac=00:18:3e:58:00:c1,bridge=br0' ]
> memory=4444
> vcpus=36
> serial="pty"
> builder="hvm"
> kernel="/xen100.migration/olh/bug1088498/nfsroot_sles12sp2.bug1088498
> /boot/vmlinuz"
> ramdisk="/xen100.migration/olh/bug1088498/nfsroot_sles12sp2.bug108849
> 8/boot/initrd"
> cmdline="quiet panic=9
> root=nfs:xen100:/share/migration/olh/bug1088498/nfsroot_sles12sp2.bug
> 1088498,vers=3,tcp,actimeo=1,nolock readonlyroot ro Xignore_loglevel
> Xdebug Xsystemd.log_target=kmsg    Xsystemd.log_level=debug Xrd.debug
> Xrd.shell Xrd.udev.debug Xudev.log-priority=debug Xrd.udev.log-
> priority=debug console=ttyS0"
> cpus="node:2"
> #pus="nodes:2"
> #pus="nodes:2,^node:0"
> #pus_soft="nodes:2,^node:0"
>
So, I do not really know what the problem could be here.

In fact, vcpu_hard_affinity is being defined, and numa_placement is
being set to false, which are both correct.

However, vcpu_hard_affinity seems to be empty:

"vcpu_hard_affinity": [
            [

            ],
            [

            ],
            [

            ],
            [

            ],
            [

            ],
            [

            ],
            [

            ],
            [

            ],
            [

            ],
            ...
            ...
            ...
        ],
        "numa_placement": "False",

Judging on the output of other xl commands, though, retrieving the cpus
from node 2 seems to work, and the fact that "node:2" behaves
differently than "node:1" is quite weird.

If we still have access to this system, it would be interesting to
instrument, e.g., update_cpumap_range() in xl_parse.c, and see what
actually libxl_node_to_cpumap() does in this case...

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/

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