[Varnish] #1576: default pcre_match_limit_recursion and thread_pool_stack dont match - varnishd child process crashes with segfault error 6 in libpcre.so.3.13.1

[Varnish]

#1576: default pcre_match_limit_recursion and thread_pool_stack dont match -
varnishd child process crashes with segfault error 6 in libpcre.so.3.13.1
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 Reporter:  abdi      |       Owner:  slink
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  4.0.1
 Severity:  normal    |  Resolution:
 Keywords:            |
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Comment (by slink):

 I should have rtfm - pcreapi(3) makes official what we thought was an
 internal api:
 > The [stack frame] estimate [...] is obtained by calling pcre_exec with
 the values NULL, NULL, NULL, -999, and -999 for its  first five arguments.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1576#comment:19>
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