[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:  phk
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  4.0.1
 Severity:  normal    |  Resolution:
 Keywords:            |
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Comment (by phk):

 So this seems to be slightly more complicated than we thought when we
 talked about it at VDD

 I played a bit around with the canonical "palindrome-checker" RE
 "(\w)(?:(?R)|\w?)\1"

 If I don't JIT compile it, it eats up 3456 bytes of stack per recursion
 (FreeBSD-current/amd64/CLANG)

 If I do JIT compile it, it eats up approx 32kB for all recursion levels up
 to at least 25

 Neither number looks like anything actionable...

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1576#comment:14>
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