[tor-bugs] #28874 [Applications/Tor Browser]: https://browserleaks.com/webgl crashes tab on 64bit Tor Browser for Windows

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#28874: https://browserleaks.com/webgl crashes tab on 64bit Tor Browser for Windows
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 Reporter:  gk                        |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  High                      |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-crash                 |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Description changed by gk:

Old description:

> On our blog one user noted that https://browserleaks.com/webgl is
> crashing their tab reliably using 8.5a6 in the 64bit flavor for Windows.
> This does not happen with the 32bit variant. And neither does this happen
> with vanilla Firfox 60.4.0esr.
>
> It seems that a bare Firefox compiled our way without any Tor Browser
> patches is crashing as well. Thus, I wonder whether we hit a GCC bug or
> something that is only affecting some 64bit system. Mysterious.

New description:

 On our blog one user noted
 (https://blog.torproject.org/comment/278911#comment-278911) that
 https://browserleaks.com/webgl is crashing their tab reliably using 8.5a6
 in the 64bit flavor for Windows. This does not happen with the 32bit
 variant. And neither does this happen with vanilla Firfox 60.4.0esr.

 It seems that a bare Firefox compiled our way without any Tor Browser
 patches is crashing as well. Thus, I wonder whether we hit a GCC bug or
 something that is only affecting some 64bit system. Mysterious.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28874#comment:1>
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