#0  malloc_consolidate (av=av@entry=0x7fd514000020) at malloc.c:4065
  [Error: malloc.c was not found in source tree]
#1  0x00007fd52a193898 in _int_free (av=0x7fd514000020, p=0x7fd514004380, have_lock=0) at malloc.c:3973
  [Error: malloc.c was not found in source tree]
#2  0x00007fd51fdeb4ea in _M_dispose (__a=..., this=0x7fd514004390) at /usr/include/c++/4.7/bits/basic_string.h:246
  [Error: /usr/include/c++/4.7/bits/basic_string.h was not found in source tree]
#3  ~basic_string (this=0x7fd51f514a40, __in_chrg=<optimized out>) at /usr/include/c++/4.7/bits/basic_string.h:536
  [Error: /usr/include/c++/4.7/bits/basic_string.h was not found in source tree]
#4  get_extensions<libproxy::config_extension> (this=0x190cdd8) at /build/buildd/libproxy-0.4.11/libmodman/module_manager.hpp:47
  [Error: /build/buildd/libproxy-0.4.11/libmodman/module_manager.hpp was not found in source tree]
#5  libproxy::proxy_factory::get_config (this=this@entry=0x190cdb0, realurl=..., config=..., ignore=...) at /build/buildd/libproxy-0.4.11/libproxy/proxy.cpp:257
  [Error: /build/buildd/libproxy-0.4.11/libproxy/proxy.cpp was not found in source tree]
#6  0x00007fd51fdec0c4 in libproxy::proxy_factory::get_proxies (this=this@entry=0x190cdb0, realurl=...) at /build/buildd/libproxy-0.4.11/libproxy/proxy.cpp:206
  [Error: /build/buildd/libproxy-0.4.11/libproxy/proxy.cpp was not found in source tree]
#7  0x00007fd51fdec59d in px_proxy_factory_get_proxies (self=0x190cdb0, url=url@entry=0x1967620 "http://geoip.ubuntu.com/") at /build/buildd/libproxy-0.4.11/libproxy/proxy.cpp:463
  [Error: /build/buildd/libproxy-0.4.11/libproxy/proxy.cpp was not found in source tree]
#8  0x00007fd524d841fe in get_libproxy_proxies (resolver=0x1904d60, uri=0x1967620 "http://geoip.ubuntu.com/", cancellable=<optimized out>, error=error@entry=0x7fd51f514d38) at glibproxyresolver.c:146
  [Error: glibproxyresolver.c was not found in source tree]
#9  0x00007fd524d84284 in _lookup_async (task=0x192f5d0, object=<optimized out>, task_data=<optimized out>, cancellable=<optimized out>) at glibproxyresolver.c:198
  [Error: glibproxyresolver.c was not found in source tree]
#10 0x00007fd52af02965 in g_task_thread_pool_thread (thread_data=0x192f5d0, pool_data=<optimized out>) at /build/buildd/glib2.0-2.35.8/./gio/gtask.c:1242
  [Error: /build/buildd/glib2.0-2.35.8/./gio/gtask.c was not found in source tree]
#11 0x00007fd52a7658b2 in g_thread_pool_thread_proxy (data=<optimized out>) at /build/buildd/glib2.0-2.35.8/./glib/gthreadpool.c:309
  [Error: /build/buildd/glib2.0-2.35.8/./glib/gthreadpool.c was not found in source tree]
#12 0x00007fd52a765075 in g_thread_proxy (data=0x1966320) at /build/buildd/glib2.0-2.35.8/./glib/gthread.c:798
  [Error: /build/buildd/glib2.0-2.35.8/./glib/gthread.c was not found in source tree]
#13 0x00007fd52a4e2f8e in start_thread (arg=0x7fd51f515700) at pthread_create.c:311
  [Error: pthread_create.c was not found in source tree]
#14 0x00007fd52a20ce1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
  [Error: ../sysdeps/unix/sysv/linux/x86_64/clone.S was not found in source tree]