On Tue, Feb 04, 2014 at 11:23:42PM +0100, Jiri Denemark wrote:
> On Tue, Feb 04, 2014 at 17:02:41 +0100, Franky Van Liedekerke wrote:
> > Hi,
> >
> > using libvirt 1.2.0 on a up-to-date Centos6.5 machine leads to
> > occasional segmentation faults (see below).
> > Sometimes it runs for 5 minutes, sometimes for an hour, but after that
> > the result is always the same: segfault after some weird qom-list, that
> > apparently the qemu version on centos doesn't know. Has 1.2.1 a known
> > fix for this?
>
> I believe the following patch should fix the crash. I'll do some testing
> tomorrow and send it as a proper patch afterwards:
>
> diff --git i/src/qemu/qemu_monitor.c w/src/qemu/qemu_monitor.c
> index a968901..cdd817f 100644
> --- i/src/qemu/qemu_monitor.c
> +++ w/src/qemu/qemu_monitor.c
> @@ -1019,7 +1019,9 @@ qemuMonitorFindBalloonObjectPath(qemuMonitorPtr mon,
> virDomainObjPtr vm,
> const char *curpath)
> {
> - size_t i, j, npaths = 0, nprops = 0;
> + size_t i, j;
> + int npaths = 0;
> + int nprops = 0;
> int ret = 0;
> char *nextpath = NULL;
> qemuMonitorJSONListPathPtr *paths = NULL;
> @@ -1045,6 +1047,8 @@ qemuMonitorFindBalloonObjectPath(qemuMonitorPtr mon,
> VIR_DEBUG("Searching for Balloon Object Path starting at %s", curpath);
>
> npaths = qemuMonitorJSONGetObjectListPaths(mon, curpath, &paths);
> + if (npaths < 0)
> + return -1;
>
> for (i = 0; i < npaths && ret == 0; i++) {
>
> @@ -1061,6 +1065,11 @@ qemuMonitorFindBalloonObjectPath(qemuMonitorPtr mon,
> * then this version of qemu/kvm does not support the feature.
> */
> nprops = qemuMonitorJSONGetObjectListPaths(mon, nextpath, &bprops);
> + if (nprops < 0) {
> + ret = -1;
> + goto cleanup;
> + }
> +
> for (j = 0; j < nprops; j++) {
> if (STREQ(bprops[j]->name, "guest-stats-polling-interval")) {
> VIR_DEBUG("Found Balloon Object Path %s", nextpath);
>
It would be desirable to extend the qemujsonmonitor test suite to exercise
the crash scenario too.
Regards,
Daniel
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