On Thu, Oct 08, 2015 at 01:29:04PM +0200, Jiri Denemark wrote: > On Thu, Oct 08, 2015 at 12:08:58 +0100, Daniel P. Berrange wrote: > > On Thu, Oct 08, 2015 at 12:06:09PM +0100, Richard W.M. Jones wrote: > > > > > > I wonder if there's a reason why it is not possible to dump the core > > > of a KVM domain which is set to autodestroy. > > > > > > $ virsh dump guestfs-4xe592eyqq4rfnk9 /tmp/guestfs-4xe592eyqq4rfnk9.core > > > error: Failed to core dump domain guestfs-4xe592eyqq4rfnk9 to /tmp/guestfs-4xe592eyqq4rfnk9.core > > > error: Requested operation is not valid: domain is marked for auto destroy > > > > > > All libguestfs domains have the autodestroy flag, but I am trying to > > > debug one which is crashing in the guest (RHBZ#1269779) and having the > > > ability to dump it would be very helpful. > > > > > > I added the following patch to libvirt, which allowed me to dump the > > > domain with no apparent ill effects. > > > > Yep, I see no reason to block use of the core dump API. Looking at the > > patch I think this is probably just an over-sight - ie it is merely > > blocked as an accidental side-effect of us blocking migration. > > I think you should actually use virsh dump --memory-only ... to go > through dump-guest-memory instead of migration. This should create an > elf formated core which crash supports better and even on ppc64, for > example. Apparently not on aarch64 however: $ ~/d/libvirt/run ~/d/libvirt/tools/virsh dump --memory-only guestfs-b1rs92hpq4izkpvi /tmp/guestfs-b1rs92hpq4izkpvi.core error: Failed to core dump domain guestfs-b1rs92hpq4izkpvi to /tmp/guestfs-b1rs92hpq4izkpvi.core error: internal error: unable to execute QEMU command 'dump-guest-memory': this feature or command is not currently supported Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://people.redhat.com/~rjones/virt-df/ -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list