[tor-bugs] #14759 [Tor]: Tor is killed with Bad system call

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#14759: Tor is killed with Bad system call
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     Reporter:  tholin  |      Owner:
         Type:  defect  |     Status:  new
     Priority:  normal  |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor     |    Version:  Tor: 0.2.6.2-alpha
   Resolution:          |   Keywords:  025-backport tor-relay
Actual Points:          |  Parent ID:
       Points:          |
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Comment (by nickm):

 So, it appears that this is what is happening:

   1. We call pthread_exit().
   2. pthread_exit() calls pthread_cancel().
   3. pthread_cancel tries to do some unwinding, and tries to run dlopen on
 libgcc_s_so
   4. dlopen fails, because of the sandbox.  (Or because of the chroot?)
   5. glibc calls __libc_fatal_message
   6. glibc tries to call libc_fatal, which tries to open /dev/tty, and
 triggers the sandbox.

 I think our best bet for solving this will be to prevent the dlopen from
 failing in step 4.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14759#comment:3>
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