[Bug 1303926] Re: qemu-system-x86_64 crashed with SIGABRT

[Serge Hallyn]

Pretty sure that commit b533f658a98325d0e47b36113bd9f5bcc046fdae is the
first bad commit.

This is interesting.  The commit is correct in that kvm_vm_ioctl()
returns -errno, not -1, on error.  However, the caller,
kvm_physical_sync_dirty_bitmap, on seeing the error, shortcuts some
extra errors to return -1 itself, but its caller then ignores its error.

An extra debug statement shows that the ioctl is getting

ioctl failed: No such file or directory

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Title:
  qemu-system-x86_64 crashed with SIGABRT

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