* Zombie guests and the inability to launch guests afterwards
@ 2013-12-02 19:10 Konrad Rzeszutek Wilk
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From: Konrad Rzeszutek Wilk @ 2013-12-02 19:10 UTC (permalink / raw)
To: xen-devel
So I launched a guest (Windows7 + GPLV some version) and when it shut
itself off it hanged on to some grant entries:
(XEN) gnttab_usage_print_all [ key 'g' pressed
(XEN) -------- active -------- -------- shared --------
(XEN) [ref] localdom mfn pin localdom gmfn flags
(XEN) grant-table for remote domain: 0 ... no active grant table entries
(XEN) -------- active -------- -------- shared --------
(XEN) [ref] localdom mfn pin localdom gmfn flags
(XEN) grant-table for remote domain: 18 (v1)
(XEN) [16228] 0 0x2ba341 0x00000001 0 0x07f541 0x19
(XEN) [16339] 0 0x2ba339 0x00000001 0 0x07f539 0x19
(XEN) [16383] 0 0x2bb0eb 0x00000001 0 0x07e6eb 0x19
(XEN) -------- active -------- -------- shared --------
[root@phenom ~]# xl list
Name ID Mem VCPUs State Time(s)
Domain-0 0 9522 7 r----- 3789.0
(null) 18 0 4 --ps-d 2021.5
Fedora 21 2048 2 -b---- 499.7
Fine, I should be able to launch other domains, right?
No. 'xl' tells me:
failed to free memory for the domain
But I do have enough memory:
[root@phenom pciback]# xl info | grep free
free_memory : 4507
However, xen hypervisor tells me something is off:
(XEN) mm.c:2019:d0 Error pfn 2ba555: rd=ffff83042fe6c000, od=0000000000000000, caf=180000000000000, taf=7400000000000001
(XEN) mm.c:2019:d0 Error pfn 2ba51b: rd=ffff83042fe6c000, od=0000000000000000, caf=180000000000000, taf=7400000000000001
(XEN) mm.c:2019:d0 Error pfn 2ba580: rd=ffff83042fe6c000, od=0000000000000000, caf=180000000000000, taf=7400000000000001
I presume that those three PFNs are associated with those zombie grants.
Now I would think we should still be able to do still launch/etc even
with a zombie around - and I know for fact that 3.4 Xen could do it.
(The reason I know this is that at Virtual Iron where I worked we had
the support to rename guests that had become zombiefied to keep on working).
So, has anybody looked at this ?
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2013-12-02 19:10 Zombie guests and the inability to launch guests afterwards Konrad Rzeszutek Wilk
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