[Varnish] #1559: Panic: Assert error in Lck__Lock(), cache/cache_lck.c line 70: Condition(((ilck))->magic == (0x7b86c8a5)) not true.

[Varnish]

#1559: Panic: Assert error in Lck__Lock(), cache/cache_lck.c line 70:
Condition(((ilck))->magic == (0x7b86c8a5)) not true.
-----------------------------+----------------------
 Reporter:  esfourteen       |       Type:  defect
   Status:  new              |   Priority:  normal
Milestone:                   |  Component:  varnishd
  Version:  4.0.1            |   Severity:  normal
 Keywords:  panic, lck_lock  |
-----------------------------+----------------------
 Child worker crashed after an uptime of several days with the following
 panic:

 {{{
 Assert error in Lck__Lock(), cache/cache_lck.c line 70:
 Condition(((ilck))->magic == (0x7b86c8a5)) not true.
 }}}

 See attachment for full backtrace.

 See this ticket for my full VCL (from another open panic related ticket):
 https://www.varnish-cache.org/trac/ticket/1553

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1559>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator