(gdb) bt 
#0  jk_shm_close (l=0x7fa53c8b20a0) at jk_shm.c:700
#1  0x00007fa5252a9358 in jk_cleanup_shmem (data=<value optimized out>) at mod_jk.c:2542
#2  0x00007fa53a88537e in ?? ()
#3  0x00007fa53a884850 in ?? ()
#4  0x00007fa53c7b1218 in ?? ()
#5  0x00007fa53c7b1128 in ?? ()
#6  0x00007fa53bd7e1d8 in ap_runtime_dir ()
#7  0x00007fa53bd7d35c in ap_document_root_check ()
#8  0x00007fa53a885355 in ?? ()
#9  0x00007fa53c7e0358 in ?? ()
#10 0x00007fa53c7b1218 in ?? ()
#11 0x0000000000000000 in ?? ()
(gdb) f
#0  jk_shm_close (l=0x7fa53c8b20a0) at jk_shm.c:700
700	            jk_log(l, JK_LOG_DEBUG,
(gdb) list 700
695	    char *wptr;
696	#endif
697	
698	    if (jk_shmem.hdr) {
699	        if (JK_IS_DEBUG_LEVEL(l)) {
700	            jk_log(l, JK_LOG_DEBUG, 
701	                   "Closed shared memory %s childs=%u",
702	                   jk_shm_name(), jk_shmem.hdr->h.data.childs);
703	        }
704	        --jk_shmem.hdr->h.data.childs;
(gdb) p jk_shmem
$1 = {
  size = 1536, 
  ajp_workers = 0, 
  lb_sub_workers = 1, 
  lb_workers = 1, 
  filename = 0x7fa53c9063b0 "/apps/jws-3.0/httpd/logs/jk.shm.22310", 
  lockname = 0x7fa53c83ab80 "/apps/jws-3.0/httpd/logs/jk.shm.22310.lock", 
  fd = 13, 
  fd_lock = 14, 
  attached = 0, 
  hdr = 0x7fa53bafd000, 
  cs = {
    __data = {
      __lock = 0, 
      __count = 0, 
      __owner = 0, 
      __nusers = 0, 
      __kind = 0, 
      __spins = 0, 
      __list = {
        __prev = 0x0, 
        __next = 0x0
      }
    }, 
    __size = '\000' <repeats 39 times>, 
    __align = 0
  }
}
(gdb) p jk_shmem.hdr->h
Cannot access memory at address 0x7fa53bafd000

(gdb) bt 
#0  0x00007f05a684ab49 in do_shm_open (fname=0x7f05bd606c38 "/apps/jws-3.0/httpd/logs/jk.shm", attached=1, sz=1152, l=0x7f05bd6130a0) at jk_shm.c:631
#1  0x00007f05a682cfe9 in jk_child_init (pconf=0x7f05bd66d128, s=<value optimized out>) at mod_jk.c:3273
#2  0x00007f05bd0c66ec in ap_run_child_init (pchild=0x7f05bd66d128, s=0x7f05bd53d320) at config.c:167
#3  0x00007f05aa9444df in child_main (child_num_arg=<value optimized out>) at prefork.c:546
#4  0x00007f05aa944b39 in make_child (s=0x7f05bd53d320, slot=2) at prefork.c:810
#5  0x00007f05aa9456dc in perform_idle_server_maintenance (_pconf=<value optimized out>, plog=<value optimized out>, s=<value optimized out>) at prefork.c:912
#6  prefork_run (_pconf=<value optimized out>, plog=<value optimized out>, s=<value optimized out>) at prefork.c:1100
#7  0x00007f05bd0ac92e in ap_run_mpm (pconf=0x7f05bd514138, plog=0x7f05bd541358, s=0x7f05bd53d320) at mpm_common.c:98
#8  0x00007f05bd0a69c1 in main (argc=7, argv=0x7ffeffe2db48) at main.c:777
(gdb) list 631
626	                   jk_shm_name(), jk_shmem.size,
627	                   jk_shmem.hdr->h.data.size - jk_shmem.hdr->h.data.pos,
628	                   jk_shmem.hdr);
629	    }
630	    else {
631	        jk_shmem.hdr->h.data.childs++;
632	        jk_shmem.attached = (int)getpid();
633	        if (JK_IS_DEBUG_LEVEL(l))
634	            jk_log(l, JK_LOG_DEBUG,
635	                   "Attached shared memory %s [%d] size=%u workers=%u free=%u addr=%#lx",
(gdb) p jk_shmem
$4 = {
  size = 1536, 
  ajp_workers = 0, 
  lb_sub_workers = 1, 
  lb_workers = 1, 
  filename = 0x7f05bd6673f0 "/apps/jws-3.0/httpd/logs/jk.shm.14637", 
  lockname = 0x7f05bd59cb40 "/apps/jws-3.0/httpd/logs/jk.shm.14637.lock", 
  fd = 13, 
  fd_lock = 14, 
  attached = 0, 
  hdr = 0x7f05bd081000, 
  cs = {
    __data = {
      __lock = 0, 
      __count = 0, 
      __owner = 0, 
      __nusers = 0, 
      __kind = 0, 
      __spins = 0, 
      __list = {
        __prev = 0x0, 
        __next = 0x0
      }
    }, 
    __size = '\000' <repeats 39 times>, 
    __align = 0
  }
}
(gdb) p jk_shmem.hdr->h
Cannot access memory at address 0x7f05bd081000