#0  __GI___pthread_mutex_lock (mutex=0x170e2) at ../nptl/pthread_mutex_lock.c:66
  [Error: ../nptl/pthread_mutex_lock.c was not found in source tree]
#1  0x00007fc0fd01d68c in gnutls_system_mutex_lock (priv=<optimized out>) at system.c:228
  [Error: system.c was not found in source tree]
#2  0x00007fc0fd0ae4c7 in wrap_nettle_rnd (_ctx=<optimized out>, level=1, data=0x7fc0e000fe90, datasize=15) at rnd.c:441
  [Error: rnd.c was not found in source tree]
#3  0x00007fc0fd0ac5d9 in _gnutls_rnd (len=15, data=0x7fc0e000fe90, level=GNUTLS_RND_RANDOM) at ./../random.h:37
  [Error: ./../random.h was not found in source tree]
#4  gen_group (q_bits=<synthetic pointer>, nbits=<optimized out>, generator=0x7fc0e000fe40, prime=0x7fc0e00011a0) at mpi.c:435
  [Error: mpi.c was not found in source tree]
#5  wrap_nettle_generate_group (group=0x7fc0e000fd00, bits=<optimized out>) at mpi.c:562
  [Error: mpi.c was not found in source tree]
#6  0x00007fc0f723b929 in _gnutls_mpi_scan (ret_mpi=0x7fc0f07bf640, buffer=<optimized out>, nbytes=<optimized out>) at gnutls_mpi.c:134
  [Error: gnutls_mpi.c was not found in source tree]
#7  0x00007fc0f723c0a0 in _gnutls_x509_read_int (node=<optimized out>, value=value@entry=0x7fc0f72a6d3b "modulus", ret_mpi=ret_mpi@entry=0x7fc0f07bf640) at gnutls_mpi.c:316
  [Error: gnutls_mpi.c was not found in source tree]
#8  0x00007fc0f726f12c in _gnutls_x509_read_rsa_params (der=0x7fc0e0009290 "0\202\001\n\002\202\001\001", dersize=270, params=params@entry=0x7fc0f07bf640) at mpi.c:64
  [Error: mpi.c was not found in source tree]
#9  0x00007fc0f726f6e7 in _gnutls_get_asn_mpis (asn=0x7fc0e00090c0, root=root@entry=0x7fc0f72a7998 "tbsCertificate.subjectPublicKeyInfo", params=params@entry=0x7fc0f07bf640, params_size=params_size@entry=0x7fc0f07bf660) at mpi.c:252
  [Error: mpi.c was not found in source tree]
#10 0x00007fc0f726f8b5 in _gnutls_x509_crt_get_mpis (cert=cert@entry=0x7fc0e0008b50, params=params@entry=0x7fc0f07bf640, params_size=params_size@entry=0x7fc0f07bf660) at mpi.c:336
  [Error: mpi.c was not found in source tree]
#11 0x00007fc0f723dc6c in _gnutls_x509_crt_to_gcert (gcert=gcert@entry=0x7fc0f07bf640, cert=0x7fc0e0008b50, flags=<optimized out>, flags@entry=6) at gnutls_cert.c:989
  [Error: gnutls_cert.c was not found in source tree]
#12 0x00007fc0f723df04 in _gnutls_x509_raw_cert_to_gcert (gcert=0x7fc0f07bf640, derCert=<optimized out>, flags=flags@entry=6) at gnutls_cert.c:901
  [Error: gnutls_cert.c was not found in source tree]
#13 0x00007fc0f723e003 in _gnutls_get_auth_info_gcert (gcert=gcert@entry=0x7fc0f07bf640, type=<optimized out>, info=<optimized out>, flags=flags@entry=6) at gnutls_cert.c:853
  [Error: gnutls_cert.c was not found in source tree]
#14 0x00007fc0f72393eb in _gnutls_get_public_rsa_params (params_len=<synthetic pointer>, params=0x7fc0f07bf620, session=0x7fc0f8309800) at auth_rsa.c:88
  [Error: auth_rsa.c was not found in source tree]
#15 _gnutls_gen_rsa_client_kx (session=0x7fc0f8309800, data=0x7fc0f07bf6e8) at auth_rsa.c:305
  [Error: auth_rsa.c was not found in source tree]
#16 0x00007fc0f72323a9 in _gnutls_send_client_kx_message (session=session@entry=0x7fc0f8309800, again=<optimized out>) at gnutls_kx.c:275
  [Error: gnutls_kx.c was not found in source tree]
#17 0x00007fc0f722f043 in _gnutls_handshake_client (session=0x7fc0f8309800) at gnutls_handshake.c:2823
  [Error: gnutls_handshake.c was not found in source tree]
#18 0x00007fc0f722f9a5 in gnutls_handshake (session=0x7fc0f8309800) at gnutls_handshake.c:2673
  [Error: gnutls_handshake.c was not found in source tree]
#19 0x00007fc0efcff793 in handshake_thread (task=0x7fc12b598d30, object=0x7fc0f8250150, task_data=<optimized out>, cancellable=<optimized out>) at gtlsconnection-gnutls.c:1195
  [Error: gtlsconnection-gnutls.c was not found in source tree]
#20 0x00007fc126b814d5 in g_task_thread_pool_thread (thread_data=0x7fc12b598d30, pool_data=<optimized out>) at /build/buildd/glib2.0-2.41.0/./gio/gtask.c:1214
  [Error: /build/buildd/glib2.0-2.41.0/./gio/gtask.c was not found in source tree]
#21 0x00007fc12661597c in g_thread_pool_thread_proxy (data=<optimized out>) at /build/buildd/glib2.0-2.41.0/./glib/gthreadpool.c:307
  [Error: /build/buildd/glib2.0-2.41.0/./glib/gthreadpool.c was not found in source tree]
#22 0x00007fc126614ff5 in g_thread_proxy (data=0x7fc0f8001850) at /build/buildd/glib2.0-2.41.0/./glib/gthread.c:764
  [Error: /build/buildd/glib2.0-2.41.0/./glib/gthread.c was not found in source tree]
#23 0x00007fc126391182 in start_thread (arg=0x7fc0f07c0700) at pthread_create.c:312
  [Error: pthread_create.c was not found in source tree]
#24 0x00007fc1260be30d 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]