[tor-bugs] #23930 [Applications/Tor Browser]: Tor Browser 7.x for Mac crashes at startup

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#23930: Tor Browser 7.x for Mac crashes at startup
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 Reporter:  wga                              |          Owner:  tbb-team
     Type:  defect                           |         Status:  assigned
 Priority:  Very High                        |      Milestone:
Component:  Applications/Tor Browser         |        Version:
 Severity:  Major                            |     Resolution:
 Keywords:  tbb-crash, TorBrowserTeam201710  |  Actual Points:
Parent ID:                                   |         Points:
 Reviewer:                                   |        Sponsor:
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Changes (by gk):

 * status:  needs_information => assigned
 * keywords:  tbb-crash => tbb-crash, TorBrowserTeam201710
 * priority:  High => Very High


Comment:

 Replying to [comment:20 mcs]:
 > wga: Thank you for running the debug build and for posting the stack
 traces. We really appreciate your help. It looks like the crash is in the
 font code. Is there anything unusual about your system with respect to the
 installed fonts? Or do you have non-Apple software installed that could
 effect which fonts are available to Tor Browser?
 >
 > arthuredelstein: Do you have any idea what could cause this crash? If
 you look at comment:19 you will see that the debug build crashed due to an
 assertion failure in `gfxFontGroup::AddFamilyToFontList()`. The source
 line is:
 > {{{
 > NS_ASSERTION(aFamily, "trying to add a null font family to fontlist");
 > }}}
 > I vaguely remember that a different OSX user experienced a similar
 problem with an older version of Tor Browser, but I cannot find a ticket.

 #16740 maybe? That said, we should not crash if the user is having
 different fonts on the computer. Getting that ticket on our radar for
 October.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23930#comment:23>
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