DebuggingSegFault

[sampleDocs-168]>R -d lldb
(lldb) target create "/Users/duncan/R-devel/build/bin/exec/R"
Current executable set to '/Users/duncan/R-devel/build/bin/exec/R' (x86_64).
(lldb) Rr
Process 37260 launched: '/Users/duncan/R-devel/build/bin/exec/R' (x86_64)

R Under development (unstable) (2018-11-10 r75583) -- "Unsuffered Consequences"
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Platform: x86_64-apple-darwin17.7.0 (64-bit)

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PID = 37260 
Time = 2019-05-17 07:26:44 
Dir = /Users/duncan/DSI/Workshops/RCInterface/Rqpdf/inst/sampleDocs 
getwd()
1> getwd()
[1] "/Users/duncan/DSI/Workshops/RCInterface/Rqpdf/inst/sampleDocs"
[26:47] 2> library(Rqpdf)
[26:49] 3> pdfInfo("rplot.pdf", "Author")
error: R debug map object file '/Users/duncan/R-devel/build/src/main/devices.o' has changed (actual time is 2019-04-06 07:38:53.000000000, debug map time is 2018-11-11 05:29:55.000000000) since this executable was linked, file will be ignored
Process 37260 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x00007fff70ca1232 libsystem_c.dylib`strlen + 18
libsystem_c.dylib`strlen:
->  0x7fff70ca1232 <+18>: pcmpeqb (%rdi), %xmm0
    0x7fff70ca1236 <+22>: pmovmskb %xmm0, %esi
    0x7fff70ca123a <+26>: andq   $0xf, %rcx
    0x7fff70ca123e <+30>: orq    $-0x1, %rax
Target 0: (R) stopped.
(lldb) up
R was compiled with optimization - stepping may behave oddly; variables may not be available.
frame #1: 0x000000010009c8de R`Rf_mkChar(name=0x0000000000000000) at envir.c:3763 [opt]
   3760	
   3761	SEXP mkChar(const char *name)
   3762	{
-> 3763	    size_t len =  strlen(name);
    	                  ^
   3764	    if (len > INT_MAX)
   3765		error("R character strings are limited to 2^31-1 bytes");
   3766	    return mkCharLenCE(name, (int) len, CE_NATIVE);
(lldb) print name
(const char *) $0 = 0x0000000000000000
(lldb) q