Re: [Xen-devel] [BUG] invocation of xl create with insufficient memory for new domU causes system reboot

["Georgy V. Repin" <grep@xxxxxxxxxxxx>]

01.04.2014 13:52, Ian Campbell ÐÐÑÐÑ:
> On Tue, 2014-04-01 at 13:35 +0400, Georgy V. Repin wrote:
> > Hello!
> >
> > 1. Problem: invocation of xl create when there is not enough memory to
> > create new domU causes oom to select process to kiill; when oom selects
> > to kill quemu-system-* process, this causes kernel panic (it's my
> > suppose, because i see no message "kernel panic" in log, but i do see
> > "CPU: 0 PID: 7899 Comm: qemu-system-i38 Not tainted 3.10.17-gentoo #1" +
> > failed call trace), and, therefore (assuming default settings) kernel
> > reboot (see log at "4.")
> > Couple of remarks:
> > - fix checking of available memory for new domU in xl toolstack could
> > serve as workaround
> > - real cause is not clear to me, maybe it's not even a xen bug (quemu ?
> > kernel ?)
> Are you using dom0_mem= together with auto ballooning enabled in the
> toolstack?
informika-xen-3 ~ # cat /proc/cmdline
placeholder root=/dev/sda1 ro

part of grub.cfg

                        if [ "$grub_platform" = "pc" -o "$grub_platform" = "" 
]; then
                            xen_rm_opts=
                        else
                            xen_rm_opts="no-real-mode edd=off"
                        fi
                        multiboot       /boot/xen-4.gz placeholder   
${xen_rm_opts}
                        echo    'Loading Linux 3.10.17-gentoo ...'
                        module  /boot/vmlinuz-3.10.17-gentoo placeholder 
root=/dev/sda1 ro

xl.conf:
# Control whether dom0 is ballooned down when xen doesn't have enough
# free memory to create a domain.  "auto" means only balloon if dom0
# starts with all the host's memory.
#autoballoon="auto"

So:
        - no dom0_mem= as boot param
        - autobaloon is set to default ("auto", i suppose)

> I think it was Xen 4.4 which gained the ability to detect dom0_mem= and
> disable ballooning automatically in that case, but I might be
> misremembering.
>
> Ian.
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