plpython crash with -O0

plpython_crash.txt

Program terminated with signal 11, Segmentation fault.
#0  0x00007fdddd6fb727 in heap_compute_data_size (tupleDesc=0x7fdddd5b6268, values=0x7fddde7a3770, isnull=0x7fddde7a37c0 "") at heaptuple.c:104
104                             VARATT_CAN_MAKE_SHORT(DatumGetPointer(val)))
(gdb) bt
#0  0x00007fdddd6fb727 in heap_compute_data_size (tupleDesc=0x7fdddd5b6268, values=0x7fddde7a3770, isnull=0x7fddde7a37c0 "") at heaptuple.c:104
#1  0x00007fdddd6fcc4a in heap_form_tuple (tupleDescriptor=0x7fdddd5b6268, values=0x7fddde7a3770, isnull=0x7fddde7a37c0 "") at heaptuple.c:688
#2  0x00007fddb7a77328 in PLyMapping_ToTuple (info=0x7fddde79e810, desc=0x7fdddd5b6268, mapping=0x7fddde7aa0b0) at plpython.c:2658
#3  0x00007fddb7a76711 in PLyObject_ToTuple (info=0x7fddde79e810, desc=0x7fdddd5b6268, plrv=0x7fddde7aa0b0) at plpython.c:2381
#4  0x00007fddb7a730aa in PLy_function_handler (fcinfo=0x7fff79863ef0, proc=0x7fddde79e7f0) at plpython.c:1224
#5  0x00007fddb7a70eda in plpython_call_handler (fcinfo=0x7fff79863ef0) at plpython.c:569
#6  0x00007fdddd85d468 in ExecMakeTableFunctionResult (funcexpr=0x7fddde69e438, econtext=0x7fddde69d060, expectedDesc=0x7fddde69dfc0, randomAccess=0 '\000') at execQual.c:2054
#7  0x00007fdddd878838 in FunctionNext (node=0x7fddde69cf50) at nodeFunctionscan.c:65
#8  0x00007fdddd864506 in ExecScanFetch (node=0x7fddde69cf50, accessMtd=0x7fdddd8787c4 <FunctionNext>, recheckMtd=0x7fdddd878889 <FunctionRecheck>) at execScan.c:82
#9  0x00007fdddd8645e5 in ExecScan (node=0x7fddde69cf50, accessMtd=0x7fdddd8787c4 <FunctionNext>, recheckMtd=0x7fdddd878889 <FunctionRecheck>) at execScan.c:164
#10 0x00007fdddd8788c5 in ExecFunctionScan (node=0x7fddde69cf50) at nodeFunctionscan.c:104
#11 0x00007fdddd859ac5 in ExecProcNode (node=0x7fddde69cf50) at execProcnode.c:400
#12 0x00007fdddd857855 in ExecutePlan (estate=0x7fddde69ce40, planstate=0x7fddde69cf50, operation=CMD_SELECT, sendTuples=1 '\001', numberTuples=0, direction=ForwardScanDirection, dest=0x7fddde693320) at execMain.c:1188
#13 0x00007fdddd85649f in standard_ExecutorRun (queryDesc=0x7fddde653220, direction=ForwardScanDirection, count=0) at execMain.c:280
#14 0x00007fdddd856393 in ExecutorRun (queryDesc=0x7fddde653220, direction=ForwardScanDirection, count=0) at execMain.c:229
#15 0x00007fdddd960e75 in PortalRunSelect (portal=0x7fddde698e20, forward=1 '\001', count=0, dest=0x7fddde693320) at pquery.c:952
#16 0x00007fdddd960b09 in PortalRun (portal=0x7fddde698e20, count=9223372036854775807, isTopLevel=1 '\001', dest=0x7fddde693320, altdest=0x7fddde693320, completionTag=0x7fff79864760 "") at pquery.c:796
#17 0x00007fdddd95a941 in exec_simple_query (query_string=0x7fddde64b5c0 "select * from myfunc()") at postgres.c:1058
#18 0x00007fdddd95ef56 in PostgresMain (argc=2, argv=0x7fddde58dbf0, username=0x7fddde58db00 "jbq") at postgres.c:3936
#19 0x00007fdddd91e1cd in BackendRun (port=0x7fddde5b44e0) at postmaster.c:3555
#20 0x00007fdddd91d7fd in BackendStartup (port=0x7fddde5b44e0) at postmaster.c:3242
#21 0x00007fdddd91a92e in ServerLoop () at postmaster.c:1431
#22 0x00007fdddd91a030 in PostmasterMain (argc=5, argv=0x7fddde58c180) at postmaster.c:1092
#23 0x00007fdddd898154 in main (argc=5, argv=0x7fddde58c180) at main.c:188