[tor-bugs] #23058 [Applications/Tor Browser Sandbox]: Sandbox Tor Browser no longer starting (100% CPU load)

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#23058: Sandbox Tor Browser no longer starting (100% CPU load)
--------------------------------------------------+---------------------
     Reporter:  pege                              |      Owner:  yawning
         Type:  defect                            |     Status:  new
     Priority:  Medium                            |  Milestone:
    Component:  Applications/Tor Browser Sandbox  |    Version:
     Severity:  Normal                            |   Keywords:
Actual Points:                                    |  Parent ID:
       Points:                                    |   Reviewer:
      Sponsor:                                    |
--------------------------------------------------+---------------------
 Sandbox Tor Browser no longer working after update to Tor Browser 7.5a3.
 (Also happens with a fresh install.)

 tor-browser-sandboxed shows that everything is ok:

 {{{
 ...
 2017/07/28 19:33:11 sandbox: bwrap pid is: 298684
 2017/07/28 19:33:11 sandbox: bwrap init pid is: 298685
 2017/07/28 19:33:11 launch: Complete.
 2017/07/28 19:33:11 update: Previous scheduled update check: 2017-07-28
 21:15:25 +0200 CEST
 2017/07/28 19:33:11 update: Initial scheduled update check:
 1h42m13.489734672s
 }}}

 But the firefox process uses 100% CPU and appears to be stuck in an
 endless loop:

 {{{
 $ strace -p 298688
 read(-2, 0x7ffcbab09010, 32)            = -1 EBADF (Bad file descriptor)
 read(-2, 0x7ffcbab09010, 32)            = -1 EBADF (Bad file descriptor)
 ...
 read(-2, 0x7ffcbab09010, 32)            = -1 EBADF (Bad file descriptor)
 read(-2, 0x7ffcbab09010, 32)            = -1 EBADF (Bad file descriptor)
 }}}

 {{{
 $ sandboxed-tor-browser -version
 sandboxed-tor-browser 0.0.12-dev (26c9478)
 }}}

 {{{
 $ lsb_release -a
 No LSB modules are available.
 Distributor ID: Debian
 Description:    Debian GNU/Linux 9.1 (stretch)
 Release:        9.1
 Codename:       stretch
 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23058>
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