Reproduce the bug with builds:
virt-v2v-1.40.2-5.el7.x86_64
libvirt-4.5.0-12.el7.x86_64
libguestfs-1.40.2-5.el7.x86_64
ovirt-imageio-common-1.5.1-0.el7ev.x86_64
ovirt-imageio-daemon-1.5.1-0.el7ev.noarch

Bug can be reproduced in non ovirt host.

Verify bug with builds:
virt-v2v-1.40.2-5.el7_7.1.x86_64
libvirt-4.5.0-23.el7.x86_64
libguestfs-1.40.2-5.el7_7.1.x86_64
ovirt-imageio-common-1.5.1-0.el7ev.x86_64
ovirt-imageio-daemon-1.5.1-0.el7ev.noarch

Steps:
1.Prepare a regular host(non ovirt host), Use virt-v2v to convert a guest to rhv with rhv-upload option:
# virt-v2v -ic vpx://root.73.141/data/10.73.75.219/?no_verify=1 esx6.7-rhel7.5-x86_64 --password-file /tmp/passwd -on rhel7.5-log -o rhv-upload -oc https://ibm-x3250m5-03.rhts.eng.pek2.redhat.com/ovirt-engine/api -os p2v_data -op /tmp/rhvpasswd -oo rhv-cafile=/home/ca.pem -oo rhv-direct=true -oo rhv-cluster=p2v

2.Wait until the transfer starts, and note the ticket value in ovirt-imageio-daemon log in ovirt host which the vm will be running on:
2019-07-24 17:09:21,371 INFO    (Thread-848) [tickets] [local] ADD ticket={u'uuid': u'ac2568cd-f49a-4ee4-973b-f9f813a760e5', u'ops': [u'write'], u'url': u'file:///rhev/data-center/mnt/10.73.224.199:_home_p2v__data/fc770a83-690b-4bd4-ab29-0696ce431a13/images/c31e480c-8b16-4879-8178-b940fc8b756c/a102f9ba-4b52-4647-a297-3e20d198e783', u'sparse': True, u'timeout': 300, u'transfer_id': u'e85a3b2c-b6bf-4ae5-88c0-983b48d10ef1', u'size': 12884901888}

3. Make the ticket expire in one second by sending this request:
curl --unix-socket /run/vdsm/ovirt-imageio-daemon.sock -X PATCH -d '{"timeout": 1}' http://localhost/tickets/ac2568cd-f49a-4ee4-973b-f9f813a760e5

4.Check the error message shows in the host:
# virt-v2v -ic vpx://root.73.141/data/10.73.75.219/?no_verify=1 esx6.7-rhel7.5-x86_64 --password-file /tmp/passwd -on rhel7.5-log -o rhv-upload -oc https://ibm-x3250m5-03.rhts.eng.pek2.redhat.com/ovirt-engine/api -os p2v_data -op /tmp/rhvpasswd -oo rhv-cafile=/home/ca.pem -oo rhv-direct=true -oo rhv-cluster=p2v
[   0.4] Opening the source -i libvirt -ic vpx://root.73.141/data/10.73.75.219/?no_verify=1 esx6.7-rhel7.5-x86_64
[   2.5] Creating an overlay to protect the source from being modified
[   3.4] Opening the overlay
[  44.9] Inspecting the overlay
[ 258.0] Checking for sufficient free disk space in the guest
[ 258.0] Estimating space required on target for each disk
[ 258.0] Converting Red Hat Enterprise Linux Server 7.5 (Maipo) to run on KVM
virt-v2v: This guest has virtio drivers installed.
[1683.8] Mapping filesystem data to avoid copying unused and blank areas
[1685.6] Closing the overlay
[1685.8] Assigning disks to buses
[1685.8] Checking if the guest needs BIOS or UEFI to boot
[1685.8] Initializing the target -o rhv-upload -oc https://ibm-x3250m5-03.rhts.eng.pek2.redhat.com/ovirt-engine/api -op /tmp/rhvpasswd -os p2v_data
[1687.2] Copying disk 1/1 to qemu URI json:{ "file.driver": "nbd", "file.path": "/var/tmp/rhvupload.ypwJJO/nbdkit0.sock", "file.export": "/" } (raw)
nbdkit: python[1]: error: /var/tmp/v2v.OyHRdT/rhv-upload-plugin.py: pwrite: error: ['Traceback (most recent call last):\n', '  File "/var/tmp/v2v.OyHRdT/rhv-upload-plugin.py", line 407, in pwrite\n    (offset, count))\n', '  File "/var/tmp/v2v.OyHRdT/rhv-upload-plugin.py", line 355, in request_failed\n    raise RuntimeError("%s: %d %s: %r" % (msg, status, reason, body[:200]))\n', "RuntimeError: could not write sector offset 127401984 size 2097152: 403 Forbidden: 'You are not allowed to access this resource: Ticket ac2568cd-f49a-4ee4-973b-f9f813a760e5 expired'\n"]
qemu-img: error while writing sector 248832: Input/output error

nbdkit: python[1]: error: /var/tmp/v2v.OyHRdT/rhv-upload-plugin.py: flush: error: ['Traceback (most recent call last):\n', '  File "/var/tmp/v2v.OyHRdT/rhv-upload-plugin.py", line 510, in flush\n    request_failed(h, r, "could not flush")\n', '  File "/var/tmp/v2v.OyHRdT/rhv-upload-plugin.py", line 355, in request_failed\n    raise RuntimeError("%s: %d %s: %r" % (msg, status, reason, body[:200]))\n', "RuntimeError: could not flush: 403 Forbidden: 'You are not allowed to access this resource: Ticket ac2568cd-f49a-4ee4-973b-f9f813a760e5 expired'\n"]
nbdkit: python[1]: error: /var/tmp/v2v.OyHRdT/rhv-upload-plugin.py: flush: error: ['Traceback (most recent call last):\n', '  File "/var/tmp/v2v.OyHRdT/rhv-upload-plugin.py", line 510, in flush\n    request_failed(h, r, "could not flush")\n', '  File "/var/tmp/v2v.OyHRdT/rhv-upload-plugin.py", line 355, in request_failed\n    raise RuntimeError("%s: %d %s: %r" % (msg, status, reason, body[:200]))\n', "RuntimeError: could not flush: 403 Forbidden: 'You are not allowed to access this resource: Ticket ac2568cd-f49a-4ee4-973b-f9f813a760e5 expired'\n"]
virt-v2v: error: qemu-img command failed, see earlier errors

If reporting bugs, run virt-v2v with debugging enabled and include the 
complete output:

  virt-v2v -v -x [...]
nbdkit: python[1]: error: /var/tmp/v2v.OyHRdT/rhv-upload-plugin.py: close: error: ['Traceback (most recent call last):\n', '  File "/var/tmp/v2v.OyHRdT/rhv-upload-plugin.py", line 530, in close\n    delete_disk_on_failure(h)\n', '  File "/var/tmp/v2v.OyHRdT/rhv-upload-plugin.py", line 516, in delete_disk_on_failure\n    disk_service.remove()\n', '  File "/usr/lib64/python2.7/site-packages/ovirtsdk4/services.py", line 37334, in remove\n    self._internal_remove(headers, query, wait)\n', '  File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 271, in _internal_remove\n    return future.wait() if wait else future\n', '  File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 55, in wait\n    return self._code(response)\n', '  File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 268, in callback\n    self._check_fault(response)\n', '  File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 132, in _check_fault\n    self._raise_error(response, body)\n', '  File "/usr/lib64/python2.7/site-packages/ovirtsdk4/service.py", line 118, in _raise_error\n    raise error\n', 'Error: Fault reason is "Operation Failed". Fault detail is "[Cannot remove Virtual Disk. Related operation is currently in progress. Please try again later.]". HTTP response code is 409.\n']

Result:There are no error info like: NameError: global name 'BrokenPipeError' is not defined.And the error info is correct when a ticket expires during import guest,so change the bug from ON_QA to VERIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2358