[Varnish] #972: varnishd asserts when trying to do 304 while streaming

[Varnish]

#972: varnishd asserts when trying to do 304 while streaming
--------------------+-------------------------------------------------------
 Reporter:  martin  |       Owner:  martin
     Type:  defect  |      Status:  new   
 Priority:  normal  |   Milestone:        
Component:  build   |     Version:  3.0.0 
 Severity:  normal  |    Keywords:        
--------------------+-------------------------------------------------------
 When the criteria for doing a 304 is met and do_stream is set, varnishd
 asserts.

 Problem spotted by DocWilco.

 ***  v1    0.6 debug| Child (11528) Panic message: Assert error in
 RES_StreamStart(), cache_response.c line 414:\n
 ***  v1    0.6 debug|   Condition((sp->wantbody) != 0) not true.\n
 ***  v1    0.6 debug| thread = (cache-worker)\n
 ***  v1    0.6 debug| ident =
 Linux,2.6.38-10-generic,x86_64,-sfile,-smalloc,-hcritbit,epoll\n
 ***  v1    0.6 debug| Backtrace:\n
 ***  v1    0.6 debug|   0x42c935: pan_ic+b5\n
 ***  v1    0.6 debug|   0x430095: RES_StreamStart+145\n
 ***  v1    0.6 debug|   0x415186: cnt_streambody+c6\n
 ***  v1    0.6 debug|   0x41684d: CNT_Session+141d\n
 ***  v1    0.6 debug|   0x42dbb8: wrk_do_cnt_sess+b8\n
 ***  v1    0.6 debug|   0x42e5e9: wrk_thread_real+409\n
 ***  v1    0.6 debug|   0x7f34b65c6d8c: _end+7f34b5f4eab4\n
 ***  v1    0.6 debug|   0x7f34b631204d: _end+7f34b5c99d75\n
 ***  v1    0.6 debug| sp = 0x7f34b0c14008 {\n
 ***  v1    0.6 debug|   f...

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Ticket URL: <http://varnish-cache.org/trac/ticket/972>
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