#0  __GI___pthread_mutex_lock (mutex=0x170e2) at ../nptl/pthread_mutex_lock.c:66
        __PRETTY_FUNCTION__ = "__pthread_mutex_lock"
        type = 4247685304
#1  0x00007fc0fd01d68c in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.28
No symbol table info available.
#2  0x00007fc0fd0ae4c7 in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.28
No symbol table info available.
#3  0x00007fc0fd0ac5d9 in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.28
No symbol table info available.
#4  0x00007fc0f723b929 in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#5  0x00007fc0f723c0a0 in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#6  0x00007fc0f726f12c in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#7  0x00007fc0f726f6e7 in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#8  0x00007fc0f723dc6c in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#9  0x00007fc0f723df04 in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#10 0x00007fc0f72393eb in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#11 0x00007fc0f72323a9 in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#12 0x00007fc0f722f043 in ?? () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#13 0x00007fc0f722f9a5 in gnutls_handshake () from /usr/lib/x86_64-linux-gnu/libgnutls.so.26
No symbol table info available.
#14 0x00007fc0efcff793 in ?? () from /usr/lib/x86_64-linux-gnu/gio/modules/libgiognutls.so
No symbol table info available.
#15 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
        task = 0x7fc12b598d30
#16 0x00007fc12661597c in g_thread_pool_thread_proxy (data=<optimized out>) at /build/buildd/glib2.0-2.41.0/./glib/gthreadpool.c:307
        task = 0x7fc12b598d30
        pool = 0x7fc129ae4550
#17 0x00007fc126614ff5 in g_thread_proxy (data=0x7fc0f8001850) at /build/buildd/glib2.0-2.41.0/./glib/gthread.c:764
        thread = 0x7fc0f8001850
#18 0x00007fc126391182 in start_thread (arg=0x7fc0f07c0700) at pthread_create.c:312
        __res = <optimized out>
        pd = 0x7fc0f07c0700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140466645108480, 1302091667283572278, 0, 0, 140466645109184, 140466645108480, -1328538186054437322, -1327514008785979850}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#19 0x00007fc1260be30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.