#0  _dl_fini () at dl-fini.c:231
  [Error: dl-fini.c was not found in source tree]
#1  0x00007f5e60b562e0 in __run_exit_handlers (status=status@entry=0, listp=0x7f5e60edd5d8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:83
  [Error: exit.c was not found in source tree]
#2  0x00007f5e60b5633a in __GI_exit (status=status@entry=0) at exit.c:105
  [Error: exit.c was not found in source tree]
#3  0x000055eb12ae2b7c in signal_cb (signum=<optimized out>) at session-child.c:175
  170: {
  171:     /* Pass on signal to child, otherwise just quit */
  172:     if (child_pid > 0)
  173:         kill (child_pid, signum);
  174:     else
  175:         exit (EXIT_SUCCESS);
  176: }
  177: 
  178: static XAuthority *
  179: read_xauth (void)
  180: {
#4  <signal handler called>
#5  0x00007f5e6235d5c7 in munmap () at ../sysdeps/unix/syscall-template.S:84
  [Error: syscall-template.S was not found in source tree]
#6  0x00007f5e6235b03d in _dl_unmap_segments (l=l@entry=0x55eb13fedb40) at ./dl-unmap-segments.h:32
  [Error: dl-unmap-segments.h was not found in source tree]
#7  _dl_unmap (map=map@entry=0x55eb13fedb40) at ../sysdeps/x86_64/tlsdesc.c:140
  [Error: tlsdesc.c was not found in source tree]
#8  0x00007f5e6235876c in _dl_close_worker (map=map@entry=0x55eb13fedb40, force=force@entry=false) at dl-close.c:678
  [Error: dl-close.c was not found in source tree]
#9  0x00007f5e6235928a in _dl_close_worker (force=false, map=0x55eb13fedb40) at dl-close.c:125
  [Error: dl-close.c was not found in source tree]
#10 _dl_close (_map=0x55eb13fedb40) at dl-close.c:822
  [Error: dl-close.c was not found in source tree]
#11 0x00007f5e62352674 in _dl_catch_error (objname=0x55eb13feb7a0, errstring=0x55eb13feb7a8, mallocedp=0x55eb13feb798, operate=0x7f5e5f3affb0 <dlclose_doit>, args=0x55eb13fedb40) at dl-error.c:187
  [Error: dl-error.c was not found in source tree]
#12 0x00007f5e5f3b0571 in _dlerror_run (operate=operate@entry=0x7f5e5f3affb0 <dlclose_doit>, args=0x55eb13fedb40) at dlerror.c:163
  [Error: dlerror.c was not found in source tree]
#13 0x00007f5e5f3affdf in __dlclose (handle=<optimized out>) at dlclose.c:46
  [Error: dlclose.c was not found in source tree]
#14 0x00007f5e61109335 in _pam_dlclose (handle=<optimized out>) at pam_dynamic.c:126
  [Error: pam_dynamic.c was not found in source tree]
#15 0x00007f5e61106cd1 in _pam_free_handlers (pamh=pamh@entry=0x55eb13feb4c0) at pam_handlers.c:986
  [Error: pam_handlers.c was not found in source tree]
#16 0x00007f5e611042a1 in pam_end (pamh=0x55eb13feb4c0, pam_status=pam_status@entry=0) at pam_end.c:35
  [Error: pam_end.c was not found in source tree]
#17 0x000055eb12ae398e in session_child_run (argc=<optimized out>, argv=<optimized out>) at session-child.c:833
  828:     pam_close_session (pam_handle, 0);
  829: 
  830:     /* Remove credentials */
  831:     pam_setcred (pam_handle, PAM_DELETE_CRED);
  832: 
  833:     pam_end (pam_handle, 0);
  834:     pam_handle = NULL;
  835: 
  836:     /* Return result of session process to the daemon */
  837:     return return_code;
  838: }
#18 0x000055eb12acdd0d in main (argc=<optimized out>, argv=<optimized out>) at lightdm.c:661
  656:     sigaction (SIGPIPE, &action, NULL);
  657:     sigaction (SIGHUP, &action, NULL);  
  658: 
  659:     /* When lightdm starts sessions it needs to run itself in a new mode */
  660:     if (argc >= 2 && strcmp (argv[1], "--session-child") == 0)
  661:         return session_child_run (argc, argv);
  662: 
  663: #if !defined(GLIB_VERSION_2_36)
  664:     g_type_init ();
  665: #endif
  666:     loop = g_main_loop_new (NULL, FALSE);