https://bugzilla.novell.com/show_bug.cgi?id=687368
https://bugzilla.novell.com/show_bug.cgi?id=687368#c4
--- Comment #4 from Jan Beulich 2011-04-26 09:48:08 UTC ---
Not NULL, but pointing to memory that is (no longer?) present. Without
/var/log/boot.msg (or whatever its equivalent is on Centos) we won't be able to
tell whether the page was there initially.
Quite possibly a dangling pointer, particularly because the stack trace seems
to indicate attempts to use xsave, support for which is off by default in the
hypervisor (and the kernel shouldn't even detect its availability) mostly
because it's incompatible with live migration up to and including Xen 4.1.0.
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