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Description of problem:
guest job locked after OpenGraphics fail because qemu have been killed
Version-Release number of selected component (if applicable):
libvirt-1.2.16-1.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1. prepare a small c progrem
# cat libvirt-test-openGraphic.c
#include <stdio.h>
#include "libvirt/libvirt.h"
int main() {
virDomainPtr dom = NULL;
virConnectPtr conn = NULL;
int ret = -1;
if (!(conn = virConnectOpen("qemu:///system")))
return ret;
dom = virDomainLookupByName(conn, "test3");
ret = virDomainOpenGraphicsFD(dom, 0, 0);
cleanup:
virConnectClose(conn);
return ret;
}
# gcc libvirt-test-openGraphic.c -lvirt -o libvirt-test-openGraphic.o
2. open another terminal to attach libvirtd and set breakpoint at qemuDomainOpenGraphicsFD:
(gdb) br qemuDomainOpenGraphicsFD
Breakpoint 1 at 0x7feca8b25590: file qemu/qemu_driver.c, line 17595.
(gdb) c
Continuing.
[Switching to Thread 0x7fecb208f700 (LWP 3234)]
3. call qemuDomainOpenGraphicsFD function via c progrem:
# ./libvirt-test-openGraphic.o
4. kill the qemu when the libvirtd in this step:
17647 if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
(gdb)
17649 qemuDomainObjEnterMonitor(driver, vm);
(gdb)
17650 ret = qemuMonitorOpenGraphics(priv->mon, protocol, pair[1], "graphicsfd", <-------kill qemu then continue
(gdb) n
17652 if (qemuDomainObjExitMonitor(driver, vm) < 0) {
(gdb)
17650 ret = qemuMonitorOpenGraphics(priv->mon, protocol, pair[1], "graphicsfd",
(gdb)
17652 if (qemuDomainObjExitMonitor(driver, vm) < 0) {
(gdb)
[Thread 0x7feca73d7700 (LWP 18028) exited]
5. restart guest:
# virsh start test3
error: Failed to start domain test3
error: Timed out during operation: cannot acquire state change lock (held by remoteDispatchDomainOpenGraphicsFd)
Actual results:
guest job locked after OpenGraphics fail because qemu have been killed
Expected results:
I used gdb to reproduce this issue as we have some bugs like this(qemu crash when libvirtd enter the monitor), so it will be a possible issue in the future.
Additional info:
This upstream patch will fix this issue:
commit 91c9e4d92099dab178de9f204f0fdb91028f071a
Author: Luyao Huang <lhuang>
Date: Tue Jun 30 11:35:13 2015 +0800
qemu: End job even if exiting monitor after OpenGraphics(FD) fails
v1.2.17-rc2-3-g91c9e4d
Verify it as follows. The result is expected. Move its status to VERIFIED.
# rpm -q libvirt
libvirt-1.2.17-1.el7.x86_64
# virsh net-edit ipv6
error: XML error: Invalid character 'x' in id '0:4:7e:7d:f0:7d:a8:bc:c5:d2:13:32:11:ed:16:ea:84:aaxxx' of network 'ipv6'
Failed. Try again? [y,n,f,?]:
error: XML error: Invalid character 'x' in id '0:4:7e:7d:f0:7d:a8:bc:c5:d2:13:32:11:ed:16:ea:84:aax66' of network 'ipv6'
Failed. Try again? [y,n,f,?]:
# virsh net-define ipv6.xml
error: Failed to define network from ipv6.xml
error: XML error: Invalid character 'x' in id '0:4:7e:7d:f0:7d:a8:bc:c5:d2:13:32:11:ed:16:ea:84:aaxx3' of network 'ipv6'
# virsh net-define ipv6.xml
error: Failed to define network from ipv6.xml
error: XML error: Invalid character 'z' in id '0:4:7e:7d:f0:7d:a8:bc:c5:d2:13:32:11:ed:16:ea:84:z3' of network 'ipv6'
I can reproduce it with libvirt-1.2.16-1.el7.x86_64
Step as in comment 0.
# virsh start r7
error: Failed to start domain r7
error: Timed out during operation: cannot acquire state change lock (held by remoteDispatchDomainOpenGraphicsFd)
error log:
2015-07-14 01:06:23.922+0000: 23122: error : qemuDomainObjBeginJobInternal:1478 : Timed out during operation: cannot acquire state change lock (held by remoteDispatchDomainOpenGraphicsFd)
Verify with libvirt-1.2.17-2.el7.x86_64
17379 if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
(gdb)
17381 qemuDomainObjEnterMonitor(driver, vm);
(gdb)
17382 ret = qemuMonitorOpenGraphics(priv->mon, protocol, pair[1], "graphicsfd",
kill qemu-kvm process
start guest again
# virsh start r7
Domain r7 started
So no any more job locked again.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-2202.html
Description of problem: guest job locked after OpenGraphics fail because qemu have been killed Version-Release number of selected component (if applicable): libvirt-1.2.16-1.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. prepare a small c progrem # cat libvirt-test-openGraphic.c #include <stdio.h> #include "libvirt/libvirt.h" int main() { virDomainPtr dom = NULL; virConnectPtr conn = NULL; int ret = -1; if (!(conn = virConnectOpen("qemu:///system"))) return ret; dom = virDomainLookupByName(conn, "test3"); ret = virDomainOpenGraphicsFD(dom, 0, 0); cleanup: virConnectClose(conn); return ret; } # gcc libvirt-test-openGraphic.c -lvirt -o libvirt-test-openGraphic.o 2. open another terminal to attach libvirtd and set breakpoint at qemuDomainOpenGraphicsFD: (gdb) br qemuDomainOpenGraphicsFD Breakpoint 1 at 0x7feca8b25590: file qemu/qemu_driver.c, line 17595. (gdb) c Continuing. [Switching to Thread 0x7fecb208f700 (LWP 3234)] 3. call qemuDomainOpenGraphicsFD function via c progrem: # ./libvirt-test-openGraphic.o 4. kill the qemu when the libvirtd in this step: 17647 if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) (gdb) 17649 qemuDomainObjEnterMonitor(driver, vm); (gdb) 17650 ret = qemuMonitorOpenGraphics(priv->mon, protocol, pair[1], "graphicsfd", <-------kill qemu then continue (gdb) n 17652 if (qemuDomainObjExitMonitor(driver, vm) < 0) { (gdb) 17650 ret = qemuMonitorOpenGraphics(priv->mon, protocol, pair[1], "graphicsfd", (gdb) 17652 if (qemuDomainObjExitMonitor(driver, vm) < 0) { (gdb) [Thread 0x7feca73d7700 (LWP 18028) exited] 5. restart guest: # virsh start test3 error: Failed to start domain test3 error: Timed out during operation: cannot acquire state change lock (held by remoteDispatchDomainOpenGraphicsFd) Actual results: guest job locked after OpenGraphics fail because qemu have been killed Expected results: I used gdb to reproduce this issue as we have some bugs like this(qemu crash when libvirtd enter the monitor), so it will be a possible issue in the future. Additional info: This upstream patch will fix this issue: commit 91c9e4d92099dab178de9f204f0fdb91028f071a Author: Luyao Huang <lhuang> Date: Tue Jun 30 11:35:13 2015 +0800 qemu: End job even if exiting monitor after OpenGraphics(FD) fails v1.2.17-rc2-3-g91c9e4d