#0  0x00007fb33b34c3a9 in _IO_vfprintf_internal (s=s@entry=0x7fb2ea5b69d0, format=<optimized out>, format@entry=0x7fb2f7a8f2d3 "%s(%s:%s):", ap=ap@entry=0x7fb2ea5b6b08) at vfprintf.c:2039
  [Error: vfprintf.c was not found in source tree]
#1  0x00007fb33b40cb75 in __GI___vasprintf_chk (result_ptr=0x7fb2ea5b6be8, flags=1, format=0x7fb2f7a8f2d3 "%s(%s:%s):", args=args@entry=0x7fb2ea5b6b08) at vasprintf_chk.c:66
  [Error: vasprintf_chk.c was not found in source tree]
#2  0x00007fb33b40cab2 in __asprintf_chk (result_ptr=result_ptr@entry=0x7fb2ea5b6be8, flags=flags@entry=1, format=format@entry=0x7fb2f7a8f2d3 "%s(%s:%s):") at asprintf_chk.c:32
  [Error: asprintf_chk.c was not found in source tree]
#3  0x00007fb2f7a8c26a in asprintf (__fmt=0x7fb2f7a8f2d3 "%s(%s:%s):", __ptr=0x7fb2ea5b6be8) at /usr/include/x86_64-linux-gnu/bits/stdio2.h:178
  [Error: /usr/include/x86_64-linux-gnu/bits/stdio2.h was not found in source tree]
#4  pam_vsyslog (pamh=0x2330710, priority=3, fmt=0x7fb2f7a8dc38 "application failed to re-exec stack [%d:%d]", args=args@entry=0x7fb2ea5b6c40) at pam_syslog.c:81
  [Error: pam_syslog.c was not found in source tree]
#5  0x00007fb2f7a8c39f in pam_syslog (pamh=pamh@entry=0x2330710, priority=priority@entry=3, fmt=fmt@entry=0x7fb2f7a8dc38 "application failed to re-exec stack [%d:%d]") at pam_syslog.c:113
  [Error: pam_syslog.c was not found in source tree]
#6  0x00007fb2f7a86c9f in _pam_dispatch (pamh=pamh@entry=0x2330710, flags=flags@entry=0, choice=choice@entry=1) at pam_dispatch.c:381
  [Error: pam_dispatch.c was not found in source tree]
#7  0x00007fb2f7a8665d in pam_authenticate (pamh=0x2330710, flags=0) at pam_auth.c:34
  [Error: pam_auth.c was not found in source tree]
#8  0x00007fb2f7ede980 in ?? () from /tmp/apport_sandbox_KY2NGM/usr/lib/x86_64-linux-gnu/unity8/qml/LightDM/libLightDM-qml.so
#9  0x00007fb2f7edeaa0 in ?? () from /tmp/apport_sandbox_KY2NGM/usr/lib/x86_64-linux-gnu/unity8/qml/LightDM/libLightDM-qml.so
#10 0x00007fb33bc8ba30 in QThreadPoolThread::run (this=0x23cd790) at thread/qthreadpool.cpp:93
  [Error: thread/qthreadpool.cpp was not found in source tree]
#11 0x00007fb33bc8ea4e in QThreadPrivate::start (arg=0x23cd790) at thread/qthread_unix.cpp:337
  [Error: thread/qthread_unix.cpp was not found in source tree]
#12 0x00007fb33a4b10a5 in start_thread (arg=0x7fb2ea5b7700) at pthread_create.c:309
  [Error: pthread_create.c was not found in source tree]
#13 0x00007fb33b3fb5ad 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]