(gdb) bt full
#0  0x00007ffff46a2108 in ?? () from /usr/lib64/libgcrypt.so.11
No symbol table info available.
#1  0x00007ffff46a2758 in ?? () from /usr/lib64/libgcrypt.so.11
No symbol table info available.
#2  0x00007ffff469e725 in ?? () from /usr/lib64/libgcrypt.so.11
No symbol table info available.
#3  0x00007ffff46b206a in ?? () from /usr/lib64/libgcrypt.so.11
No symbol table info available.
#4  0x00007ffff7bad9ed in packet_hmac_verify (session=<optimized out>, buffer=0x7fffe4003c50, mac=
    0x7fffec376000 "\207D\305ܿ\332\343\065\004E\n\227ڔ\020\234VFQ#") at /usr/src/debug/libssh-0.5.2/src/crypt.c:202
        hmacbuf = "\024a\272\263\364\244]\006\365\274\356\v\242\227\362t\317g\361h", '\000' <repeats 15 times>
        ctx = 0x7fffe4004150
        len = <optimized out>
        seq = 1375731712
#5  0x00007ffff7bbde59 in ssh_packet_socket_callback (data=0x7fffe4012f18, receivedlen=36, user=0x7fffe4003390) at /usr/src/debug/libssh-0.5.2/src/packet.c:221
        session = 0x7fffe4003390
        blocksize = <optimized out>
        current_macsize = 20
        mac = "\207D\305ܿ\332\343\065\004E\n\227ڔ\020\234VFQ#\000\000\000\000\000\000\000\000\000"
        buffer = "\000\000\000\f\006a\000\000\000\060RGk\254", <incomplete sequence \330>
        packet = 0x7fffe4012f28
        to_be_read = <optimized out>
        rc = <optimized out>
        len = <optimized out>
        padding = <optimized out>
        processed = 16
        __FUNCTION__ = "ssh_packet_socket_callback"
#6  0x00007ffff7bbe1db in ssh_packet_socket_callback (data=0x7fffe4012ed4, receivedlen=<optimized out>, user=0x7fffe4003390)
    at /usr/src/debug/libssh-0.5.2/src/packet.c:278
        session = 0x7fffe4003390
        blocksize = <optimized out>
        current_macsize = <optimized out>
        mac = "0.\375\035\274\312\363\001\265(w\224\201\345\263\362\310r\247\317\000\000\000\000\000\000\000\000\000"
        buffer = "\000\000\000,\022b\000\000\000\060\000\000\000\vex"
        packet = 0x7fffe4012ee4
        to_be_read = <optimized out>
        rc = <optimized out>
        len = <optimized out>
        padding = <optimized out>
        processed = 68
        __FUNCTION__ = "ssh_packet_socket_callback"
#7  0x00007ffff7bbe1db in ssh_packet_socket_callback (data=0x7fffe4012eb0, receivedlen=<optimized out>, user=0x7fffe4003390)
    at /usr/src/debug/libssh-0.5.2/src/packet.c:278
---Type <return> to continue, or q <return> to quit---
        session = 0x7fffe4003390
        blocksize = <optimized out>
        current_macsize = <optimized out>
        mac = "\350\225\v\327\257l\317Id\371\060\067q\016\247\267\265\361g\334\000\000\000\000\000\000\000\000\000"
        buffer = "\000\000\000\f\006`\000\000\000\060zv\033\271\016="
        packet = 0x7fffe4012ec0
        to_be_read = <optimized out>
        rc = <optimized out>
        len = <optimized out>
        padding = <optimized out>
        processed = 36
        __FUNCTION__ = "ssh_packet_socket_callback"
#8  0x00007ffff7bc29fd in ssh_socket_pollcallback (p=<optimized out>, fd=<optimized out>, revents=1, v_s=0x7fffe4003b90)
    at /usr/src/debug/libssh-0.5.2/src/socket.c:283
        s = 0x7fffe4003b90
        buffer = 
    "\017\a\271tS\326\336ő\004\020\206\017Pt+\350\225\v\327\257l\317Id\371\060\067q\016\247\267\265\361g\334\062o2\351E\337Xl\365\274\214\351\060U\207D\f|\372$\230\375:\222\327\032I\214\035\273\370;9[\314t\001\362\062\220\341\071\214##|90.\375\035\274\312\363\001\265(w\224\201\345\263\362\310r\247\317\026; h\004\004\377\244G2\302q\201>*\017\207D\305ܿ\332\343\065\004E\n\227ڔ\020\234VFQ#3\201n4'h\355\345C2n\316\001\206\223\031\351\300p\r\202\245͒\315h\355l\237X]\335?\371\306\345\225\314\360\277\002\034+\321\345_ۗi\020\205n\347\273\335\025\236'ْ\177\303\033\262\316C\036cA>\244M\260\364\254\236*\242\270q\327mXV\306\016\277\224%\263\274E2\377\n\025m\337\274G\232\032\221\214\n\v\000\205F6\004\216\203+Ia\343\021%\275\340m\v\336\374R\253\224\037\272\071\067\205\204t\f\032e\017\000L^\315\356jf\244\264\026\277\062\264\301\277\065\263v1ah\360\061\243\037\\\022\035\277\213\031\230\067\210\375z\261&\233\355m\364qO\365r\354\366\363`e:\032\253{qi\177\266N\000\371\377\277ms\350^\302K\205Z\353\236:\n\035\266.\273\005rG\340"...
        r = <optimized out>
        err = 0
        errlen = 4
#9  0x00007ffff7bbf40c in ssh_poll_ctx_dopoll (ctx=0x7fffe4004040, timeout=<optimized out>) at /usr/src/debug/libssh-0.5.2/src/poll.c:602
        ret = <optimized out>
        rc = 1
        i = 0
        used = 1
        p = <optimized out>
        fd = <optimized out>
        revents = <optimized out>
#10 0x00007ffff7bbff37 in ssh_handle_packets (session=0x7fffe4003390, timeout=-2) at /usr/src/debug/libssh-0.5.2/src/session.c:469
        spoll_in = 0x7fffe4004010
        spoll_out = 0x7fffe4004010
        ctx = 0x7fffe4004040
        tm = <optimized out>
        rc = <optimized out>
        __FUNCTION__ = "ssh_handle_packets"
#11 0x00007ffff7ba7fbf in ssh_channel_read (channel=0x7fffe40061a0, dest=0x7fffec3772f0, count=128, is_stderr=<optimized out>)
    at /usr/src/debug/libssh-0.5.2/src/channels.c:2404
---Type <return> to continue, or q <return> to quit---
        session = 0x7fffe4003390
        stdbuf = 0x7fffe4005e20
        len = <optimized out>
        rc = <optimized out>
        __FUNCTION__ = "ssh_channel_read"
#12 0x00007ffff7bc0820 in ssh_scp_close (scp=0x7fffe4006140) at /usr/src/debug/libssh-0.5.2/src/scp.c:150
        buffer = 
    "\000\000\000\000\000\000\000\000\067\377\273\367\000\000\000\000\260\250\227\000\000\000\000\000\376\377\377\377\001\000\000\000\000^\000\344\377\177\000\000\000\000\000\000\000\000\000\000`]\000\344\377\177\000\000\005\000\000\000\v", '\000' <repeats 11 times>"\320, M\221", '\000' <repeats 13 times>, "@a\000\344\377\177\000\000\023\005", '\000' <repeats 14 times>"\360, M\221\000\000\000\000\000\320M\221\000\000\000\000"
        err = <optimized out>
#13 0x00000000004904b6 in SshMasterConnection::copy() ()
No symbol table info available.
#14 0x0000000000491310 in SshMasterConnection::channelLoop() ()
No symbol table info available.
#15 0x000000000049547d in SshMasterConnection::run() ()
No symbol table info available.
#16 0x00007ffff5aeeb8b in QThreadPrivate::start (arg=0x914dd0) at thread/qthread_unix.cpp:298
        __clframe = {__cancel_routine = 0x7ffff5aed8e0 <QThreadPrivate::finish(void*)>, __cancel_arg = 0x914dd0, __do_it = 1, __cancel_type = <optimized out>}
        thr = 0x914dd0
        data = 0x914c90
#17 0x00007ffff585eb99 in start_thread (arg=0x7fffec3f8700) at pthread_create.c:301
        __res = <optimized out>
        pd = 0x7fffec3f8700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {1, -1406206671429654969, 140737488337392, 140737156975040, 140737354125376, 3, 1406246807872644679, 
    1406193390698669639}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#18 0x00007ffff4e0e0cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#19 0x0000000000000000 in ?? ()
No symbol table info available.