[tor-bugs] #11465 [Tor]: Log a backtrace on sandbox failure.

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#11465: Log a backtrace on sandbox failure.
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     Reporter:  nickm   |      Owner:
         Type:  defect  |     Status:  new
     Priority:  normal  |  Milestone:  Tor: 0.2.5.x-final
    Component:  Tor     |    Version:
   Resolution:          |   Keywords:  tor-client sandbox linux
Actual Points:          |  Parent ID:
       Points:          |
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Comment (by nickm):

 Well, *that* was a fun one to diagnose. :/

 First, it's necessary to make libc load symbols before we install the
 sandbox filter. Otherwise, it will try to read some symbol tables from
 some elf files and fail badly.

 Second, we needed to allow the writev() syscall.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11465#comment:1>
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