[tbb-bugs] #25389 [Applications/Tor Browser]: backport Subprocess.jsm runaway CPU fix (Mozilla 1370027)

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#25389: backport Subprocess.jsm runaway CPU fix (Mozilla 1370027)
--------------------------------------+------------------------------
 Reporter:  mcs                       |          Owner:  tbb-team
     Type:  defect                    |         Status:  needs_review
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  TorBrowserTeam201802R     |  Actual Points:
Parent ID:  #24689                    |         Points:
 Reviewer:                            |        Sponsor:  Sponsor4
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Changes (by mcs):

 * keywords:   => TorBrowserTeam201802R
 * status:  new => needs_review


Comment:

 The Mozilla patch applied cleanly to ESR52 without any changes. Here is
 the patch:
 https://gitweb.torproject.org/user/brade/tor-
 browser.git/commit/?h=bug25389-01

 Kathy and I tested this on Linux and macOS (the changes should not affect
 Windows), and confirmed that the runaway CPU problem is indeed fixed. We
 never reproduced the problem on macOS but it was easy to get it to occur
 on Linux.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25389#comment:1>
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