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In master, recursive grep searches involving the nested grep engine segfaults.

bin/icgrep -rn "Composition" ..

Here is a gdb backtrace:

cameron@cs-osl-08:~/parabix-devel/debug-build$ gdb bin/icgrep
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Reading symbols from bin/icgrep...
(gdb) set args -rn 'Composit' ..
(gdb) run
Starting program: /home/cameron/parabix-devel/debug-build/bin/icgrep -rn 'Composit' ..
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
warning: could not find '.gnu_debugaltlink' file for /lib/x86_64-linux-gnu/libtinfo.so.6
[New Thread 0x7ffff2c006c0 (LWP 651650)]
[New Thread 0x7ffff22006c0 (LWP 651651)]
[Thread 0x7ffff22006c0 (LWP 651651) exited]
[Thread 0x7ffff2c006c0 (LWP 651650) exited]
icgrep: /home/cameron/parabix-devel/include/kernel/core/kernel.h:307: const kernel::Binding& kernel::Kernel::getOutputStreamSetBinding(unsigned int) const: Assertion `i < getNumOfStreamOutputs()' failed.

Thread 1 "icgrep" received signal SIGABRT, Aborted.
__pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
warning: 44	./nptl/pthread_kill.c: No such file or directory
(gdb) bt
#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3  0x00007ffff5a4527e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4  0x00007ffff5a288ff in __GI_abort () at ./stdlib/abort.c:79
#5  0x00007ffff5a2881b in __assert_fail_base (fmt=0x7ffff5bd01e8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7ffff7f7bc6b "i < getNumOfStreamOutputs()", 
    file=file@entry=0x7ffff7f7c118 "/home/cameron/parabix-devel/include/kernel/core/kernel.h", line=line@entry=307, 
    function=function@entry=0x7ffff7f7f988 "const kernel::Binding& kernel::Kernel::getOutputStreamSetBinding(unsigned int) const") at ./assert/assert.c:96
#6  0x00007ffff5a3b517 in __assert_fail (assertion=0x7ffff7f7bc6b "i < getNumOfStreamOutputs()", file=0x7ffff7f7c118 "/home/cameron/parabix-devel/include/kernel/core/kernel.h", line=307, 
    function=0x7ffff7f7f988 "const kernel::Binding& kernel::Kernel::getOutputStreamSetBinding(unsigned int) const") at ./assert/assert.c:105
#7  0x00007ffff7f68630 in kernel::Kernel::getOutputStreamSetBinding (i=0, this=0x555555d88df0) at /home/cameron/parabix-devel/include/kernel/core/kernel.h:307
#8  kernel::Kernel::getOutputStreamSet (i=0, this=0x555555d88df0) at /home/cameron/parabix-devel/include/kernel/core/kernel.h:312
#9  grep::NestedInternalSearchEngine::push (this=this@entry=0x7fffffffdeb0, patterns=std::vector of length 3, capacity 4 = {...}) at /home/cameron/parabix-devel/lib/grep/nested_grep_engine.cpp:150
#10 0x00007ffff7fa81e7 in argv::recursiveFileSelect (driver=..., dirpath=..., pathSelectEngine=..., collectedPaths=std::vector of length 0, capacity 0) at /home/cameron/parabix-devel/lib/fileselect/file_select.cpp:243
#11 0x00007ffff7faa04d in argv::getFullFileList (driver=..., inputFiles=...) at /home/cameron/parabix-devel/lib/fileselect/file_select.cpp:409
#12 0x00005555555679a4 in main (argc=<optimized out>, argv=<optimized out>) at /home/cameron/parabix-devel/tools/icgrep/icgrep.cpp:97