(gdb) bt
#0  0x00007f210d0ca733 in __wt_calloc (session=0x56292672be68, number=1, size=16, retp=0x7ffd9d1e1108) at ../src/os_common/os_alloc.c:50
#1  0x00007f210d3c351e in _wrap_Connection_async_new_op (self=<optimised out>, args=<optimised out>) at wiredtiger_wrap.c:8665
#2  0x000056292577044e in PyEval_EvalFrameEx ()
#3  0x000056292576c462 in PyEval_EvalFrameEx ()
#4  0x0000562925764b3a in PyEval_EvalCodeEx ()
#5  0x0000562925780a9d in ?? ()
#6  0x000056292575090e in PyObject_Call ()
#7  0x0000562925769d99 in PyEval_EvalFrameEx ()
#8  0x0000562925764b3a in PyEval_EvalCodeEx ()
#9  0x0000562925780809 in ?? ()
#10 0x000056292579956e in ?? ()
#11 0x000056292575090e in PyObject_Call ()
#12 0x00005629257f651b in ?? ()
#13 0x000056292576c650 in PyEval_EvalFrameEx ()
#14 0x0000562925764b3a in PyEval_EvalCodeEx ()
#15 0x0000562925780a9d in ?? ()
#16 0x000056292575090e in PyObject_Call ()
#17 0x0000562925769d99 in PyEval_EvalFrameEx ()
#18 0x0000562925764b3a in PyEval_EvalCodeEx ()
#19 0x0000562925780809 in ?? ()
#20 0x000056292579956e in ?? ()
#21 0x000056292575090e in PyObject_Call ()
#22 0x00005629257f651b in ?? ()
#23 0x000056292576c650 in PyEval_EvalFrameEx ()
#24 0x000056292576c462 in PyEval_EvalFrameEx ()
#25 0x000056292576c462 in PyEval_EvalFrameEx ()
#26 0x0000562925764b3a in PyEval_EvalCodeEx ()
#27 0x000056292579550f in ?? ()
#28 0x0000562925790202 in PyRun_FileExFlags ()
#29 0x000056292578fcad in PyRun_SimpleFileExFlags ()
#30 0x000056292573ed7b in Py_Main ()
#31 0x00007f210ea001c1 in __libc_start_main (main=0x56292573e6e0 <main>, argc=5, argv=0x7ffd9d1e2818, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7ffd9d1e2808)
    at ../csu/libc-start.c:308
#32 0x000056292573e5fa in _start ()
(gdb) f 0
#0  0x00007f210d0ca733 in __wt_calloc (session=0x56292672be68, number=1, size=16, retp=0x7ffd9d1e1108) at ../src/os_common/os_alloc.c:50
50			WT_STAT_CONN_INCR(session, memory_allocation);
(gdb) p (session)->stat_bucket
$1 = 645054928
(gdb) p session
$2 = (WT_SESSION_IMPL *) 0x56292672be68