I've noticed that when I start crash under kvm (both kvm-68 and
kvm-70) I get the following error during live crash (with both
4.0-4.6.1 and 4.0-6.3) initialization:

crash: read error: kernel virtual address: ffff8100171f0000  type:
"kmem_cache_s buffer"
crash: unable to initialize kmem slab cache subsystem

As a result 'kmem -s' within crash returns:
kmem: kmem cache slab subsystem not available

My host is x86_64 RHEL5U1 running 2.6.25.4 with kvm-70 (kvm-intel).
I've tried both RHEL5U1 x86_64 and RHEL5U2 x86 guests running with a
2.6.22.19 kernel.  These same kernel/distro pairs work fine with crash
in a non-kvm guest environment.

Anyone else experienced this problem when trying to use crash in a kvm guest?
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