[Varnish] #1417: Panic on abandon in vcl_backend_response

[Varnish]

#1417: Panic on abandon in vcl_backend_response
-------------------+----------------------
 Reporter:  fgsch  |       Type:  defect
   Status:  new    |   Priority:  normal
Milestone:         |  Component:  varnishd
  Version:  trunk  |   Severity:  normal
 Keywords:         |
-------------------+----------------------
 ***  v1    0.8 debug| Child (29331) died signal=6 (core dumped)\n
 ***  v1    0.8 debug| Child (29331) Panic message: Assert error in
 vbf_stp_fetchhdr(), cache/cache_fetch.c line 277:\n
 ***  v1    0.8 debug|   Condition(wrk->handling == VCL_RET_DELIVER) not
 true.\n

 See attached test.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1417>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator