The prior two traces were when I locked up Evince with Ctrl minus and
Ctrl plus.

This one is done with trackpad pinch to zoom.  It has a thread exit in it too, 
maybe that's something.
These are the remaining threads:
(gdb) info thread
  Id   Target Id         Frame 
  6    Thread 0x7fe7c0fa3700 (LWP 4508) "evince" pthread_cond_wait@@GLIBC_2.3.2
    () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
  5    Thread 0x7fe7c17a4700 (LWP 4507) "evince" 0x00007fe7d5311773 in 
__GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>)
    at ../sysdeps/unix/sysv/linux/poll.c:87
  4    Thread 0x7fe7c77fe700 (LWP 4506) "evince" 
pthread_cond_timedwait@@GLIBC_2.3.2 () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:216
  2    Thread 0x7fe7ccfdd700 (LWP 4504) "evince" 0x00007fe7d5311773 in 
__GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>)
    at ../sysdeps/unix/sysv/linux/poll.c:87
* 1    Thread 0x7fe7d8a0d9a0 (LWP 4503) "evince" 0x00007fe7d5311773 in 
__GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>)
    at ../sysdeps/unix/sysv/linux/poll.c:87
(gdb) 


** Attachment added: "gdb backtrace of crash #3 - using pinch gesture"
   
https://bugs.launchpad.net/ubuntu/+source/evince/+bug/875359/+attachment/2548864/+files/backtrace3.txt

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https://bugs.launchpad.net/bugs/875359

Title:
  evince locks up when zooming in or out

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