#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
        set = {__val = {86023, 16278306580581635328, 140006646285204, 3, 140006646285552, 140007224287376, 140006646285712, 94890575759808, 140007226545600, 140007225778211, 206158430256, 140006646285456, 140006646285264, 140007225647268, 140007224380368, 1}}
        pid = <optimized out>
        tid = <optimized out>
        ret = <optimized out>
#1  0x00007f55f8e4a859 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0xce000, sa_sigaction = 0xce000}, sa_mask = {__val = {140006404390912, 10317824, 10153984, 316629, 16278306580581635328, 840048, 3, 140006646286000, 140007224287419, 140006646286160, 94890575759808, 140007226545600, 140007225778211, 206158430256, 140006646285904, 140006646285712}}, sa_flags = -118267740, sa_restorer = 0x7f55c8067180}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f55f8eb53ee in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f55f8fdf285 "%s\n") at ../sysdeps/posix/libc_fatal.c:155
        ap = {{gp_offset = 24, fp_offset = 0, overflow_arg_area = 0x7f55d66b06c0, reg_save_area = 0x7f55d66b0650}}
        fd = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
#3  0x00007f55f8ebd47c in malloc_printerr (str=str@entry=0x7f55f8fe1690 "double free or corruption (!prev)") at malloc.c:5347
No locals.
#4  0x00007f55f8ebf12c in _int_free (av=Quit