#0  fast_validate (str=<optimized out>) at /build/buildd/glib2.0-2.42.0/./glib/gutf8.c:1461
  [Error: /build/buildd/glib2.0-2.42.0/./glib/gutf8.c was not found in source tree]
#1  g_utf8_validate (str=str@entry=0x0, max_len=max_len@entry=-1, end=end@entry=0x0) at /build/buildd/glib2.0-2.42.0/./glib/gutf8.c:1629
  [Error: /build/buildd/glib2.0-2.42.0/./glib/gutf8.c was not found in source tree]
#2  0x00007fcb6bd3647e in strdup_len (string=0x0, len=-1, bytes_written=0x0, bytes_read=0x0, error=0x0) at /build/buildd/glib2.0-2.42.0/./glib/gconvert.c:837
  [Error: /build/buildd/glib2.0-2.42.0/./glib/gconvert.c was not found in source tree]
#3  0x00007fcb6bd37134 in g_locale_to_utf8 (opsysstring=0x0, len=-1, bytes_read=0x0, bytes_written=0x0, error=0x0) at /build/buildd/glib2.0-2.42.0/./glib/gconvert.c:905
  [Error: /build/buildd/glib2.0-2.42.0/./glib/gconvert.c was not found in source tree]
#4  0x0000000000455589 in ?? ()
#5  0x0000000000456fae in ?? ()
#6  0x00007fcb6c2dd75f in run_in_thread (job=<optimized out>, c=0xdbe6d0, _data=0x1073bd0) at /build/buildd/glib2.0-2.42.0/./gio/gsimpleasyncresult.c:858
  [Error: /build/buildd/glib2.0-2.42.0/./gio/gsimpleasyncresult.c was not found in source tree]
#7  0x00007fcb6c2ca586 in io_job_thread (task=<optimized out>, source_object=<optimized out>, task_data=0x1052c80, cancellable=<optimized out>) at /build/buildd/glib2.0-2.42.0/./gio/gioscheduler.c:85
  [Error: /build/buildd/glib2.0-2.42.0/./gio/gioscheduler.c was not found in source tree]
#8  0x00007fcb6c2edc45 in g_task_thread_pool_thread (thread_data=0x103a0f0, pool_data=<optimized out>) at /build/buildd/glib2.0-2.42.0/./gio/gtask.c:1215
  [Error: /build/buildd/glib2.0-2.42.0/./gio/gtask.c was not found in source tree]
#9  0x00007fcb6bd7b2b8 in g_thread_pool_thread_proxy (data=<optimized out>) at /build/buildd/glib2.0-2.42.0/./glib/gthreadpool.c:307
  [Error: /build/buildd/glib2.0-2.42.0/./glib/gthreadpool.c was not found in source tree]
#10 0x00007fcb6bd7a925 in g_thread_proxy (data=0xb2bd90) at /build/buildd/glib2.0-2.42.0/./glib/gthread.c:764
  [Error: /build/buildd/glib2.0-2.42.0/./glib/gthread.c was not found in source tree]
#11 0x00007fcb6b32d0a5 in start_thread (arg=0x7fcb61a34700) at pthread_create.c:309
  [Error: pthread_create.c was not found in source tree]
#12 0x00007fcb6b05a84d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
  [Error: ../sysdeps/unix/sysv/linux/x86_64/clone.S was not found in source tree]