(gdb) bt
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44
#1  0x00007fbfc389f9ff in __pthread_kill_internal (threadid=<optimized out>, signo=6) at ./nptl/pthread_kill.c:89
#2  0x00007fbfc384acc2 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3  0x00007fbfc38334ac in __GI_abort () at ./stdlib/abort.c:77
#4  0x000055b02387ec15 in ExceptionalCondition (conditionName=conditionName@entry=0x55b0238f5bee "bms_is_valid_set(a)", fileName=fileName@entry=0x55b0238f5ec4 "bitmapset.c",
    lineNumber=lineNumber@entry=906) at assert.c:65
#5  0x000055b02357867d in bms_membership (a=<optimized out>) at bitmapset.c:906
#6  0x00007fbfc3db9e21 in test_bms_membership (fcinfo=<optimized out>) at test_bitmapset.c:254
#7  0x000055b0235138a1 in ExecInterpExpr (state=0x55b02cbf92c0, econtext=0x55b02cbf8f68, isnull=<optimized out>) at execExprInterp.c:936
#8  0x000055b023552475 in ExecEvalExprNoReturn (state=0x55b02cbf92c0, econtext=0x55b02cbf8f68) at ../../../src/include/executor/executor.h:431
#9  ExecEvalExprNoReturnSwitchContext (state=0x55b02cbf92c0, econtext=0x55b02cbf8f68) at ../../../src/include/executor/executor.h:472
#10 ExecProject (projInfo=0x55b02cbf92b8) at ../../../src/include/executor/executor.h:504
#11 ExecResult (pstate=<optimized out>) at nodeResult.c:135
#12 0x000055b023517aeb in ExecProcNode (node=0x55b02cbf8e58) at ../../../src/include/executor/executor.h:327
#13 ExecutePlan (queryDesc=0x55b02cb1f3c0, operation=CMD_SELECT, sendTuples=true, numberTuples=0, direction=<optimized out>, dest=0x55b02cbf77a0) at execMain.c:1776
#14 standard_ExecutorRun (queryDesc=0x55b02cb1f3c0, direction=<optimized out>, count=0) at execMain.c:377
#15 0x000055b0237236d8 in PortalRunSelect (portal=portal@entry=0x55b02cb7f600, forward=forward@entry=true, count=0, count@entry=9223372036854775807, dest=dest@entry=0x55b02cbf77a0) at pquery.c:917
#16 0x000055b023724cee in PortalRun (portal=portal@entry=0x55b02cb7f600, count=count@entry=9223372036854775807, isTopLevel=isTopLevel@entry=true, dest=dest@entry=0x55b02cbf77a0,
    altdest=altdest@entry=0x55b02cbf77a0, qc=qc@entry=0x7fffcda59a80) at pquery.c:761
#17 0x000055b02372082a in exec_simple_query (query_string=0x55b02caf6e40 "SELECT test_bms_membership('true');") at postgres.c:1297
#18 0x000055b023722487 in PostgresMain (dbname=<optimized out>, username=<optimized out>) at postgres.c:4946
#19 0x000055b02371c54d in BackendMain (startup_data=<optimized out>, startup_data_len=<optimized out>) at backend_startup.c:124
#20 0x000055b02365f4c9 in postmaster_child_launch (child_type=<optimized out>, child_slot=1, startup_data=startup_data@entry=0x7fffcda59f20, startup_data_len=startup_data_len@entry=24,
    client_sock=client_sock@entry=0x7fffcda59f40) at launch_backend.c:268
#21 0x000055b023662f70 in BackendStartup (client_sock=0x7fffcda59f40) at postmaster.c:3643
#22 ServerLoop () at postmaster.c:1729
#23 0x000055b0236649ec in PostmasterMain (argc=argc@entry=3, argv=argv@entry=0x55b02caf1640) at postmaster.c:1416
#24 0x000055b023316d2a in main (argc=3, argv=0x55b02caf1640) at main.c:227