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Description of problem:
I am trying to perform a "virsh dump" of a KVM guest that has crashed,
but the command times out and then fails with the error message:
error: Failed to shutdown domain rhel6-smp-1g
error: Timed out during operation: cannot acquire state change lock
Version-Release number of selected component (if applicable):
KVM host:
kernel-2.6.32-68.el6.x86_64
libvirt-0.8.1-27.el6.x86_64
qemu-kvm-0.12.1.2-2.112.el6.x86_64
KVM guest:
kernel-2.6.32-68.el6.x86_64
How reproducible:
Always.
Steps to Reproduce:
1. start guest session
2. log into KVM guest, and force a panic:
# echo 1 > /proc/sys/kernel/sysrq
# echo c > /proc/sysrq-trigger
3. from KVM host:
# virsh dump <KVM-guest-name> /var/crash/vmcore
Actual results:
# virsh dump rhel6-smp-1g /var/crash/vmcore
error: Failed to core dump domain rhel6-smp-1g to /var/crash/vmcore
error: Timed out during operation: cannot acquire state change lock
#
And FWIW, nothing seems to be able to communicate with the guest:
# virsh shutdown rhel6-smp-1g
error: Failed to shutdown domain rhel6-smp-1g
error: Timed out during operation: cannot acquire state change lock
# virsh suspend rhel6-smp-1g
error: Failed to suspend domain rhel6-smp-1g
error: Timed out during operation: cannot acquire state change lock
#
Expected results:
Create vmcore.
Additional info:
The same error occurs if I try to "Pause", "Shutdown", or "Force Off"
the guest from the virt-manager GUI. It just continues to show the
guest as "Running", but it's unresponsive to any commands.
This looks to be a duplicate of BZ #623903:
https://bugzilla.redhat.com/show_bug.cgi?id=623903
623903 - query-balloon commmand didn't return on pasued guest cause virt-manger hang
But that one is currently only flagged as: rhel‑6.1.0?
I would think that an issue of this magnitude would have to addressed
in RHEL6.0?
Adding lwang to the cc: list for her input.
> This looks to be a duplicate of BZ #623903:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=623903
> 623903 - query-balloon commmand didn't return on pasued guest cause
> virt-manger hang
It isn't technically a duplicate, but it is a pretty closely related problem. That BZ is refering to the case where QEMU has explicitly paused guest execution, so it *knows* that the guest won't respond. In this case the QEMU still has the guest running, but the guest OS has crashed. QEMU doesn't know this, so it'll never get a response. We can likely generalize the solution for 623903 to cope with this 'guest crashed' case too though.