[tbb-bugs] #17925 [Tor Browser]: Investigate memory consumption of hardened Tor Browser builds

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#17925: Investigate memory consumption of hardened Tor Browser builds
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 Reporter:  gk            |          Owner:  tbb-team
     Type:  task          |         Status:  new
 Priority:  Medium        |      Milestone:
Component:  Tor Browser   |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tbb-hardened  |  Actual Points:
Parent ID:                |         Points:
  Sponsor:                |
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Comment (by yawning):

 Part of it is most definitely a feature.

 Memory that's freed is not immediately released back to the system, but
 instead is put into a quarantine list to allow catching use-after-free
 errors.  As far as I can tell, the default quarantine size with our
 current hardened build is 256 MiB.

 Updating to a newer GCC will set this to `-1` per the documentation, which
 I assume will lead to even more hilarity.  The quarantine size is runtime
 tunable, though the option name has changed between what we are currently
 building with, and what the documentation describes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17925#comment:2>
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