MyHTML BEWM!

Program received signal SIGSEGV, Segmentation fault.
0xb530cdb0 in mcsync_atomic_compare_exchange (ptr=0x0, compare=0, exchange=1) at utils/mcsync.c:29
29          return __atomic_compare_exchange_n(ptr, &compare, exchange, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
(gdb) bt full
#0  0xb530cdb0 in mcsync_atomic_compare_exchange (ptr=0x0, compare=0, exchange=1) at utils/mcsync.c:29
No locals.
#1  0xb530ce55 in mcsync_lock (mcsync=0x0) at utils/mcsync.c:102
No locals.
#2  0xb530ca22 in mcobject_async_node_delete (mcobj_async=0xa2e6bf0, node_idx=0)
    at utils/mcobject_async.c:336
        node = 0x1
        chunk = 0xb52f51dc <myhtml_tree_list_destroy+61>
#3  0xb52f8942 in myhtml_tag_index_destroy (tags=0xb44e160, index_tags=0xb43f550) at tag.c:104
No locals.
#4  0xb52f4538 in myhtml_tree_index_destroy (tree=0xb3a0868, tags=0xb44e160) at tree.c:312
No locals.
#5  0xb52f431f in myhtml_tree_destroy (tree=0xb3a0868) at tree.c:258
No locals.
#6  0xb7db70c3 in dcCall_x86_cdecl () from /home/cbwood/.rakudobrew/moar-nom/install/lib/libmoar.so
No symbol table info available.
#7  0xb7db6a6a in dc_callvm_call_x86_cdecl () from /home/cbwood/.rakudobrew/moar-nom/install/lib/libmoar.so
No symbol table info available.
#8  0xb7db672a in dcCallPointer () from /home/cbwood/.rakudobrew/moar-nom/install/lib/libmoar.so
No symbol table info available.
#9  0xb7d0ed94 in MVM_nativecall_invoke () from /home/cbwood/.rakudobrew/moar-nom/install/lib/libmoar.so
No symbol table info available.
#10 0xb7cf1598 in MVM_interp_run () from /home/cbwood/.rakudobrew/moar-nom/install/lib/libmoar.so
No symbol table info available.
#11 0xb7db3b0d in MVM_vm_run_file () from /home/cbwood/.rakudobrew/moar-nom/install/lib/libmoar.so
No symbol table info available.
#12 0x08048c53 in main ()