On Tue, Nov 6, 2012 at 12:07 PM, Guido Winkelmann <guido-kvml@xxxxxxxxxxxxxxxxx> wrote: > Am Montag, 29. Oktober 2012, 12:29:01 schrieb Stefan Hajnoczi: >> On Fri, Oct 19, 2012 at 2:55 PM, Guido Winkelmann >> <guido-kvml@xxxxxxxxxxxxxxxxx> wrote: >> > Am Donnerstag, 18. Oktober 2012, 18:05:39 schrieb Avi Kivity: >> >> On 10/18/2012 05:50 PM, Guido Winkelmann wrote: >> >> > Am Mittwoch, 17. Oktober 2012, 13:25:45 schrieb Brian Jackson: >> >> >> >> >> >> What about newer versions of qemu/kvm? But of course if those work, >> >> >> your >> >> >> next task is going to be git bisect it or file a bug with your distro >> >> >> that >> >> >> is using an ancient version of qemu/kvm. >> >> > >> >> > I've just upgraded both hosts to qemu-kvm 1.2.0 >> >> > (qemu-1.2.0-14.fc17.x86_64, >> >> > built from spec files under >> >> > http://pkgs.fedoraproject.org/cgit/qemu.git/). >> >> > >> >> > The bug is still there. >> >> >> >> If you let the guest go idle (no I/O), then migrate it, then restart the >> >> I/O, do the errors show? >> > >> > Just tested - yes, they do. >> >> The -EIO error does not really reveal why there is a problem. You can >> use SystemTap probes in QEMU to find out more about the nature of the >> error. >> >> # stap -e 'probe qemu.kvm.bdrv_*, qemu.kvm.virtio_blk_*, >> qemu.kvm.paio_* { printf("%s(%s)\n", probefunc(), $$parms) }' -x >> $PID_OF_QEMU > > This does not work for me. When I try running this, I'm getting many pages of > errors like this: > > ====== > # stap -e 'probe qemu.kvm.bdrv_*, qemu.kvm.virtio_blk_*, qemu.kvm.paio_* { > printf("%s(%s)\n", probefunc(), $$parms) }' -x 1623 > parse error: expected statement > saw: keyword at /usr/share/systemtap/tapset/qemu-alpha.stp:1455:3 > source: function = $arg3; > ^ > parse error: expected identifier > saw: operator '=' at /usr/share/systemtap/tapset/qemu- > alpha.stp:1455:12 > source: function = $arg3; > ^ > 2 parse errors. > ====== > > Unfortunately, I don't know the first thing about systemtap, so I don't really > know what's happening here... The QEMU .stp files on your system are using SystemTap keywords as variable names ("function"). SystemTap gets upset about this. In upstream qemu.git fixes have been merged so this does not happen again in the future. For now, you could edit the QEMU .stp files on disk to replace "function" with "function_". Stefan -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
