.
Thread 1 (Thread 0x7f01ed7b2880 (LWP 19896)):
#0  0x00007f01ec37f117 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 19896
        selftid = 19896
#1  0x00007f01ec380808 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7fff462076df, sa_sigaction = 0x7fff462076df}, sa_mask = {__val = {139646236122502, 4208904, 141, 4294967295, 139646234761507, 4294967296, 140734369915360, 8589934593, 0, 4294967296, 0, 0, 0, 21474836480, 139646256152576, 139646236137648}}, sa_flags = 4209144, sa_restorer = 0x403b80 <main::__PRETTY_FUNCTION__>}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f01ec377fc6 in __assert_fail_base (fmt=0x7f01ec4c98b0 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x4039f8 "mir_connection_is_valid(connection)", file=file@entry=0x403908 "/build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp", line=line@entry=141, function=function@entry=0x403b80 <main::__PRETTY_FUNCTION__> "int main(int, char**)") at assert.c:92
        str = 0xc5ca60 "\270wp\354\001\177"
        total = 4096
#3  0x00007f01ec378072 in __GI___assert_fail (assertion=0x4039f8 "mir_connection_is_valid(connection)", file=0x403908 "/build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp", line=141, function=0x403b80 <main::__PRETTY_FUNCTION__> "int main(int, char**)") at assert.c:101
No locals.
#4  0x0000000000402e73 in main (argc=<optimized out>, argv=0x7fff46206488) at /build/buildd/mir-0.6.1+14.10.20140814/examples/scroll.cpp:141
        connection = 0xc5a1e0
        __PRETTY_FUNCTION__ = "int main(int, char**)"
        native_display = <optimized out>
        num_windows = 1
        arg = <optimized out>