When making snapshot of running virtualmachine guest the process got stuck and left below traces in logfile. I had to kill hte snapshot process and reboot machine to continue.
vboxmanage snapshot mymachine take initial
00:00:14.576 PCNet#0: The link is back up again after the restore. 00:03:47.980 Changing the VM state from 'RUNNING' to 'RUNNING_LS'. 00:03:48.014 00:03:48.014 !!R0-Assertion Failed!! 00:03:48.014 Expression: <NULL> 00:03:48.014 Location : /build/buildd/virtualbox-4.1.12-dfsg/src/VBox/VMM/VMMAll/PGMAllBth.h(1458) void pgmR0BthEPTProtSyncPageWorkerTrackDeref(PVMCPU, PPGMPOOLPAGE, RTHCPHYS, uint16_t, RTGCPHYS) 00:03:48.014 HCPhys=00000000d5a37000 wasn't found!
After reboot i see:
# vboxmanage list vms
"<inaccessible>" {d1d42d8a-38ed-4d6d-95a1-356d2896ff26}
When trying to start the machine I get
Could not access VM "tracker".
Problem can be resolved by opening machinename.vbox file and manually deleting the newly inserted child nodes in HardDisk
<HardDisk uuid="{fd141646-df1c-46c7-950b-77eb3deb86f0}" location="mymachinedisk.vdi" format="VDI" type="Normal">
<HardDisk uuid="{2c232969-47d8-4977-8605-d208c3fa60fa}" location="Snapshots/{2c232969-47d8-4977-8605-d208c3fa60fa}.vdi" format="VDI"/>
</HardDisk>
needs to be replace with following and you can start the machine again. For peace of min you can delete the files in Snapshot folder as well.
<HardDisk uuid="{fd141646-df1c-46c7-950b-77eb3deb86f0}" location="mymachinedisk.vdi" format="VDI" type="Normal">
</HardDisk>
