[Xen-devel] error in xen/arch/x86/mm.c:get_page during migration

[Olaf Hering <olaf@xxxxxxxxx>]

While doing "while xm migrate --live domU localhost;do sleep 2;done" I
see many errors from get_page:

...
(XEN) HVM56 restore: TSC_ADJUST 0
(XEN) HVM56 restore: TSC_ADJUST 1
(XEN) mm.c:1982:d0 Error pfn 41a863: rd=ffff83036ffef000, od=0000000000000000, 
caf=180000000000000, taf=7400000000000001
(XEN) mm.c:1982:d0 Error pfn 41be1c: rd=ffff83036ffef000, od=0000000000000000, 
caf=180000000000000, taf=7400000000000001
(XEN) mm.c:1982:d0 Error pfn 41a862: rd=ffff83036ffef000, od=0000000000000000, 
caf=180000000000000, taf=7400000000000001
(XEN) mm.c:1982:d0 Error pfn 41b90f: rd=ffff83036ffef000, od=0000000000000000, 
caf=180000000000000, taf=7400000000000001
(XEN) mm.c:1982:d0 Error pfn 41b49a: rd=ffff83036ffef000, od=0000000000000000, 
caf=180000000000000, taf=7400000000000001
(XEN) mm.c:1982:d0 Error pfn 41b48d: rd=ffff83036ffef000, od=0000000000000000, 
caf=180000000000000, taf=7400000000000001
(XEN) irq.c:375: Dom56 callback via changed to Direct Vector 0xf3
(XEN) HVM56 save: CPU
...

The pfn number and the amount of pfn differs during iterations, but in the end
only these two variants appear:

# xm dmesg | grep -w mm | cut -d : -f 4- | sort | uniq -c | sort
     22  rd=ffff83036ffef000, od=0000000000000000, caf=180000000000000, 
taf=7400000000000001
     46  rd=ffff83036ffef000, od=0000000000000000, caf=180000000000000, 
taf=0000000000000001


It does not seem to cause issues other than the log output.
Does it indiciate a real bug?

Olaf

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