#0  0x00007fc546903428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
        resultvar = 0
        pid = 683
        selftid = 683
#1  0x00007fc54690502a in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x3030303030303020, sa_sigaction = 0x3030303030303020}, sa_mask = {__val = {2319406834570502192, 2314885530818453552, 2314885530818453536, 8320808738715869216, 3975845442405294435, 3905574394905584486, 
              8299421020363698224, 3474871470917693728, 3904684855570477104, 2314912026858828064, 2314885530818453536, 2314885530818453536, 3420032447996239904, 7237954629762904676, 4049920665945836080, 3975887029563437923}}, sa_flags = 875914086, sa_restorer = 0x5d}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fc5469457ea in __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0x7fc546a5eed8 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
        ap = <error reading variable ap (Attempt to dereference a generic pointer.)>
        fd = 2
        on_2 = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
        written = <optimized out>
#3  0x00007fc54694e37a in malloc_printerr (ar_ptr=<optimized out>, ptr=<optimized out>, str=0x7fc546a5f008 "double free or corruption (!prev)", action=3) at malloc.c:5006
        buf = "000055e445d81920"
        cp = <optimized out>
        ar_ptr = <optimized out>
        str = 0x7fc546a5f008 "double free or corruption (!prev)"
        action = 3
#4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3867
        size = <optimized out>
        fb = <optimized out>
        nextchunk = <optimized out>
        nextsize = <optimized out>
        nextinuse = <optimized out>
        prevsize = <optimized out>
        bck = <optimized out>
        fwd = <optimized out>
        errstr = <optimized out>
        locked = <optimized out>
#5  0x00007fc54695253c in __GI___libc_free (mem=<optimized out>) at malloc.c:2968
        ar_ptr = <optimized out>
        p = <optimized out>
        hook = <optimized out>
#6  0x000055e443166b32 in ProcXIUngrabDevice (client=0x55e445eda720) at ../../Xi/xigrabdev.c:169
        dev = 0x55e4454a9550
        grab = 0x55e445d81920
        ret = 0
        time = <optimized out>
        stuff = <optimized out>
#7  0x000055e44306ed9f in Dispatch () at ../../dix/dispatch.c:430
        clientReady = 0x55e4456d94c0
        result = <optimized out>
        client = 0x55e445eda720
        nready = 0
        icheck = 0x55e44346f130 <checkForInput>
        start_tick = 150
#8  0x000055e443072e13 in dix_main (argc=11, argv=0x7ffe480c7ac8, envp=<optimized out>) at ../../dix/main.c:300
        i = <optimized out>
        alwaysCheckForInput = {0, 1}
#9  0x00007fc5468ee830 in __libc_start_main (main=0x55e44305d030 <main>, argc=11, argv=0x7ffe480c7ac8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe480c7ab8) at ../csu/libc-start.c:291
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 9128812606376213279, 94438865358912, 140730107198144, 0, 0, 3063600680144567071, 3094542024982493983}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x55e4431e21a0 <__libc_csu_fini>, 0x7fc548a2cab0 <_dl_fini>}, 
            data = {prev = 0x0, cleanup = 0x0, canceltype = 1126048160}}}
        not_first_call = <optimized out>
#10 0x000055e44305d069 in _start ()