[Varnish] #1630: Varnish crashes with long regex condition

[Varnish]

#1630: Varnish crashes with long regex condition
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 Reporter:  huguesalary  |       Owner:
     Type:  defect       |      Status:  new
 Priority:  normal       |   Milestone:
Component:  varnishd     |     Version:  4.0.2
 Severity:  normal       |  Resolution:
 Keywords:               |
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Comment (by huguesalary):

 So, increasing the thread_pool_stack worked, but it seems like I still
 sometimes get a crash, so I might not have increased it enough.

 I noticed that thread_pool_stack is marked as experimental in the doc and
 was defaulted to -1 in varnish 3, which I assume was "disabling" it.

 I tried setting it to -1 on varnish 4 but couldn't get any page of my
 website to load, so assumed that -1 in varnish 4 was not valid (although I
 did not investigate more).

 So here are some questions:
 - since this param is marked as experimental is there any way to "disable"
 it?
 - is there any documentation available describing this param more in
 depth? (considering I read: https://www.varnish-
 cache.org/docs/4.0/reference/varnishd.html#thread-pool-stack)

 Thanks!

 -Hugues

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1630#comment:3>
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