I've not attempted to debug this, but this did work at point - its been a while since I've needed dmalloc.

Linking the following program from a configure script with -ldmallocth results in a segfault when it blows-out its stack space.  The problem appears to be completely in the start-up; using ktrace, it never reaches the first line of main().

ISTR observing this in a much earlier version of dmalloc on solaris and it was a problem with dmalloc repeatedly trying to re-initialize itself.

This is fbsd 10.2-p12 with the latest dmalloc from binary pkgs (or source).

# include <stdlib.h>
# include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <openssl/opensslv.h>
#define DATA "conftest.sslincver"
#include <dmalloc.h>
int main(void) {
      FILE *fd;
      int rc;

      fd = fopen(DATA,"w");
      if (fd == NULL)
              exit(1);

      if ((rc = fprintf(fd ,"%lx (%s)\n", (long)OPENSSL_VERSION_NUMBER,
                        OPENSSL_VERSION_TEXT)) <0)
              exit(1);

      exit(0);
}

gcc -o conftest -pthread -pthread -D_REENTRANT -D_THREAD_SAFE -DINET6 -I/usr/local/include -pthread -L/usr/local/lib -g conftest.c -lpthread -lutil -ldmallocth -lssl -lz -lcrypto test.c

Core was generated by `conftest'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libthr.so.3...(no debugging symbols found)...done.
Loaded symbols for /lib/libthr.so.3
Reading symbols from /lib/libutil.so.9...(no debugging symbols found)...done.
Loaded symbols for /lib/libutil.so.9
Reading symbols from /usr/local/lib/libdmallocth.so.1...(no debugging symbols fo
und)...done.
Loaded symbols for /usr/local/lib/libdmallocth.so.1
Reading symbols from /usr/lib/libssl.so.7...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libssl.so.7
Reading symbols from /lib/libz.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libz.so.6
Reading symbols from /lib/libcrypto.so.7...(no debugging symbols found)...done. 
Loaded symbols for /lib/libcrypto.so.7
Reading symbols from /lib/libc.so.7...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /libexec/ld-elf.so.1...(no debugging symbols found)...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x0000000800c62b5a in dmalloc_malloc ()
   from /usr/local/lib/libdmallocth.so.1
[New LWP 101621]
(gdb) whe
#0  0x0000000800c62b5a in dmalloc_malloc ()
   from /usr/local/lib/libdmallocth.so.1
#1  0x0000000800c6387b in calloc () from /usr/local/lib/libdmallocth.so.1
#2  0x000000080082f0fa in pthread_kill () from /lib/libthr.so.3
#3  0x00000008008302d3 in pthread_timedjoin_np () from /lib/libthr.so.3
#4  0x000000080082d4ca in pthread_mutex_lock () from /lib/libthr.so.3
#5  0x0000000800c62944 in dmalloc_shutdown ()
   from /usr/local/lib/libdmallocth.so.1
#6  0x0000000800c62e51 in dmalloc_malloc ()
   from /usr/local/lib/libdmallocth.so.1
#7  0x0000000800c62b82 in dmalloc_malloc ()
   from /usr/local/lib/libdmallocth.so.1
#8  0x0000000800c6387b in calloc () from /usr/local/lib/libdmallocth.so.1
#9  0x000000080082f0fa in pthread_kill () from /lib/libthr.so.3
#10 0x00000008008302d3 in pthread_timedjoin_np () from /lib/libthr.so.3
#11 0x000000080082d4ca in pthread_mutex_lock () from /lib/libthr.so.3
#12 0x0000000800c62944 in dmalloc_shutdown ()
   from /usr/local/lib/libdmallocth.so.1
#13 0x0000000800c62e51 in dmalloc_malloc ()
   from /usr/local/lib/libdmallocth.so.1
#14 0x0000000800c62b82 in dmalloc_malloc ()
   from /usr/local/lib/libdmallocth.so.1
#15 0x0000000800c6387b in calloc () from /usr/local/lib/libdmallocth.so.1
#16 0x000000080082f0fa in pthread_kill () from /lib/libthr.so.3
#17 0x00000008008302d3 in pthread_timedjoin_np () from /lib/libthr.so.3
#18 0x000000080082d4ca in pthread_mutex_lock () from /lib/libthr.so.3
#19 0x0000000800c62944 in dmalloc_shutdown ()
   from /usr/local/lib/libdmallocth.so.1
#20 0x0000000800c62e51 in dmalloc_malloc ()
   from /usr/local/lib/libdmallocth.so.1
#21 0x0000000800c62b82 in dmalloc_malloc ()
   from /usr/local/lib/libdmallocth.so.1
        .... thousands of loops