Recently released version 5.0.4 includes these fixes:

- Fix to support KVM dumpfiles created with "virsh dump" that create
  "cpu" header sections using a QEMU CPU_SAVE_VERSION version greater 
  than the supported version of 9.  Without the patch, the crash
  session fails during initialization with the error message "crash: 
  qemu-load.c:501: cpu_init_load_64: Assertion `version_id >= 4 && 
  version_id <= 9' failed."  The patch now accepts CPU_VERSION_VERSION
  values up to 12.  

- Fix for x86_64 KVM dumpfiles created with "virsh dump" whose kernels
  have a "_text" virtual address higher than __START_KERNEL_map.
  Without the patch, the physical base address calculation fails,
  making the dumpfile unusable.

- Implemented a new "map" command that is seen only when running with
  KVM guest dumpfiles created with "virsh dump".  The layout of this
  dumpfile format does not allow the access of system memory in a
  "random-access" manner.  Therefore, during session initialization, a 
  potentially time-consuming dumpfile scan procedure is required to 
  create a physical-memory-to-file-offset memory map for use during the
  session.  The new "map" command allows the user to either append the
  memory map to the end of the dumpfile, or to create a discrete memory
  map file.  In either case, the dumpfile scan will not be required 
  during subsequent sessions.  The command's help page may be seen by 
  entering "crash -h map".

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crash does not support recent qemu dump format
https://bugs.launchpad.net/bugs/559219
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