Public bug reported:

When attempting to do a blockpull the following error occurs and the VM
crashes.

qemu-system-x86_64: /build/qemu-Eap4uc/qemu-2.11+dfsg/block/io.c:1042: 
bdrv_co_do_copy_on_readv: Assertion `skip_bytes < pnum' failed.
2019-02-17 17:38:27.820+0000: shutting down, reason=crashed

This appears to be fixed upstream.
https://patchwork.kernel.org/patch/10512135/
https://github.com/qemu/qemu/commit/b0ddcbbb36a66a605eb232b905cb49b1cc72e74e

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New

** Package changed: qemu-kvm (Ubuntu) => qemu (Ubuntu)

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https://bugs.launchpad.net/bugs/1818264

Title:
  QEMU 2.11.1 VM crash when performing block pull.
  bdrv_co_do_copy_on_readv

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