backtrace.c

void print_backtrace(int skip) {
	void *backtrace_array[MAX_STACK];
	int stack_size = backtrace(backtrace_array, MAX_STACK);
	backtrace_symbols_fd(&backtrace_array[skip+1], 
	    stack_size - skip - 1, STDERR_FILENO);
}

void signal_backtrace(int signum) {
	fprintf(stderr, "%s\n\n", strsignal(signum));
	print_backtrace(2);
	signal(signum, SIG_DFL);
	kill(getpid(), signum);
}

mdriver.c.diff

diff --git a/mdriver.c b/mdriver.c
index 283c522..eb05408 100644
--- a/mdriver.c
+++ b/mdriver.c
@@ -20,6 +20,7 @@
 #include <unistd.h>
 
 
+#include "backtrace.h"
 #include "mm.h"
 #include "memlib.h"
 #include "fsecs.h"
@@ -273,6 +274,7 @@ int main(int argc, char **argv)
     double util_weight = 0, perf_weight = 0;
     int numcorrect;
 
+    signal(SIGSEGV, signal_backtrace);
 
     setbuf(stdout, 0);
     setbuf(stderr, 0);

usage

$ ./mdriver.debug
Using default tracefiles in ./traces/
Measuring performance with a cycle counter.
Segmentation fault: 11

0   libsystem_c.dylib                   0x00007fff7d221408 __sF + 152
1   libsystem_c.dylib                   0x00007fff91b358dc fgets + 41
2   mdriver.debug                       0x000000010b7666df mhz_full + 129
3   mdriver.debug                       0x000000010b766735 mhz + 26
4   mdriver.debug                       0x000000010b765f7a init_fsecs + 125
5   mdriver.debug                       0x000000010b762cb3 main + 1084
6   libdyld.dylib                       0x00007fff94d835fd start + 1

Well.. GNU documentation on backtrace says backtrace() and backtrace_symbol_fd() are async-signal unsafe ("AS-Unsafe") so they should not be invoked inside a signal handler. See Linux signal safety for further clarifications. :)