[Varnish] #1417: Panic on abandon in vcl_backend_response

[Varnish]

#1417: Panic on abandon in vcl_backend_response
----------------------+------------------------------
 Reporter:  fgsch     |       Owner:
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:  Varnish 4.0-TP2
Component:  varnishd  |     Version:  trunk
 Severity:  normal    |  Resolution:
 Keywords:            |
----------------------+------------------------------
Changes (by fgsch):

 * milestone:   => Varnish 4.0-TP2


Old description:

> ***  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.

New description:

 {{{
 ***  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#comment:1>
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