[Varnish] #1386: 4.0tp1 crashes around every 6 hours

[Varnish]

#1386: 4.0tp1 crashes around every 6 hours
--------------------+------------------------------
 Reporter:  scoof   |       Owner:
     Type:  defect  |      Status:  new
 Priority:  normal  |   Milestone:  Varnish 4.0-TP1
Component:  build   |     Version:  unknown
 Severity:  normal  |  Resolution:
 Keywords:          |
--------------------+------------------------------

Comment (by scoof):

 {{{
 #0  0x0000000000419374 in VBO_extend (bo=0x7fbf68edb020, l=14205)
     at cache/cache_busyobj.c:224
 #1  0x0000000000426253 in VFP_Fetch_Body (bo=0x7fbf68edb020, est=0)
     at cache/cache_fetch_proc.c:227
 #2  0x00000000004242ce in vbf_stp_fetch (wrk=0x7fc28feaac40,
 bo=0x7fbf68edb020)
     at cache/cache_fetch.c:459
 #3  0x000000000042508b in vbf_fetch_thread (wrk=0x7fc28feaac40,
     priv=0x7fbf68edb020) at ../../include/tbl/steps.h:56
 #4  0x000000000043a912 in Pool_Work_Thread (priv=0x7fc2bbc0e300,
     wrk=0x7fc28feaac40) at cache/cache_pool.c:295
 #5  0x00000000004534f8 in wrk_thread_real (priv=0x7fc2bbc0e300,
     thread_workspace=2048) at cache/cache_wrk.c:143
 #6  0x0000000000453621 in WRK_thread (priv=0x7fc2bbc0e300)
     at cache/cache_wrk.c:161
 #7  0x00007fc2c6fa08ba in start_thread () from /lib/libpthread.so.0
 #8  0x00007fc2c6d0802d in clone () from /lib/libc.so.6
 #9  0x0000000000000000 in ?? ()
 }}}

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1386#comment:2>
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