[Varnish] #1628: Assert error in VBO_DerefBusyObj()

[Varnish]

#1628: Assert error in VBO_DerefBusyObj()
---------------------------------+----------------------
 Reporter:  Jay                  |       Type:  defect
   Status:  new                  |   Priority:  normal
Milestone:  Varnish 4.0 release  |  Component:  varnishd
  Version:  trunk                |   Severity:  normal
 Keywords:                       |
---------------------------------+----------------------
 Assert error in VBO_DerefBusyObj(), cache/cache_busyobj.c line 171:
 Condition((bo) != NULL) not true.
 thread = (cache-worker) version = varnish-trunk revision NOGIT ident =
 Linux,3.14.22,x86_64,-smalloc,-smalloc,-hcritbit,epoll

 Backtrace:   0x4325df: pan_ic+0xef   0x41826d: VBO_DerefBusyObj+0x32d
 0x42394a: VBF_Fetch+0x29a   0x4379b0: CNT_Request+0x16c0   0x44cc9b:
 HTTP1_Session+0x41b   0x4398d7: ses_req_pool_task+0x67   0x43a814:
 SES_pool_accept_task+0x2b4   0x434b3e: Pool_Work_Thread+0x36e   0x447653:
 WRK_Thread+0x103   0x433a8b: pool_thread+0x2b req = 0x7f15cd2317b0 {   sp
 = 0x7f15cc89b790, vxid = 57754958,  step = R_STP_LOOKUP,   req_body =
 R_BODY_NONE,   restarts = 0, esi_level = 0   sp = 0x7f15cc89b790 {     fd
 = 3181, vxid = 57754957,     client = xxxx 52155,     step =
 S_STP_WORKING,   },   worker = 0x7f15dc5c6c50 {     stack =
 {0x7f15dc5c7000 -> 0x7f15dc5bb000}     ws = 0x7f15dc5c6e60 {       id =
 "wrk",       {s,f,r,e}

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1628>
Varnish <https://varnish-cache.org/>
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