[IBM z Systems] Getting server crash when jit_above_cost =0

Hi,

We are  getting a server crash on zlinux machine  if we set
jit_above_cost=0 in postgresql.conf file after configuring  PG v12
server  with --with-llvm ( llvm-ttoolset-6.0)

We configured  PG v12 sources with switch --with-llvm  ( after setting
these variables on command prompt )

 export
LD_LIBRARY_PATH=/opt/rh/llvm-toolset-6.0/root/usr/lib64:$LD_LIBRARY_PATH
 export LLVM_CONFIG=/opt/rh/llvm-toolset-6.0/root/usr/bin/llvm-config
 export CLANG=/opt/rh/llvm-toolset-6.0/root/usr/bin/clang
 export LDFLAGS="-Wl,-rpath,/opt/rh/llvm-toolset-6.0/root/lib64
${LDFLAGS}"; export LDFLAGS

postgresql.conf file -

"
shared_preload_libraries=$libdir/llvmjit' ,
jit_provider = 'llvmjit'  ,
jit_above_cost = 0
jit=on,
"

able to see the crash  against any sql query

psql (12.2)
Type "help" for help.

postgres=# select 5;
2020-04-21 07:33:15.980 CDT [48149] DEBUG:  StartTransaction(1) name:
unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
2020-04-21 07:33:15.980 CDT [48149] DEBUG:  probing availability of JIT
provider at /home/edb/pg/edb/edbpsql/lib/postgresql/llvmjit.so
2020-04-21 07:33:15.980 CDT [48149] DEBUG:  successfully loaded JIT
provider in current session
2020-04-21 07:33:15.981 CDT [48149] DEBUG:  LLVMJIT detected CPU "z13",
with features ""
terminate called after throwing an instance of 'std::bad_function_call'
  what():  bad_function_call
server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.
The connection to the server was lost. Attempting reset: 2020-04-21
07:33:16.476 CDT [48137] DEBUG:  reaping dead processes

*Stack trace*

[edb(at)etpgabc bin]$ gdb -q -c data/core.31542 postgres
Reading symbols from /home/edb/pg/edb/edbpsql/bin/postgres...done.
[New LWP 31542]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `postgres: edb postgres [local] SELECT '.
Program terminated with signal 6, Aborted.
#0  0x000003ffa9841220 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install
glibc-2.17-260.el7.s390x libedit-3.0-12.20121213cvs.el7.s390x
libffi-3.0.13-18.el7.s390x libgcc-4.8.5-39.el7.s390x
libstdc++-4.8.5-39.el7.s390x
llvm-toolset-6.0-llvm-libs-6.0.1-5.el7.s390x
ncurses-libs-5.9-14.20130511.el7_4.s390x zlib-1.2.7-18.el7.s390x
(gdb) bt
#0  0x000003ffa9841220 in raise () from /lib64/libc.so.6
#1  0x000003ffa9842aa8 in abort () from /lib64/libc.so.6
#2  0x000003ff9f7881b4 in __gnu_cxx::__verbose_terminate_handler() ()
from /lib64/libstdc++.so.6
#3  0x000003ff9f785c7e in ?? () from /lib64/libstdc++.so.6
#4  0x000003ff9f785cb6 in std::terminate() () from /lib64/libstdc++.so.6
#5  0x000003ff9f785f60 in __cxa_throw () from /lib64/libstdc++.so.6
#6  0x000003ff9f7e4468 in std::__throw_bad_function_call() () from
/lib64/libstdc++.so.6
#7  0x000003ffa139e5c4 in
std::function<std::unique_ptr<llvm::orc::IndirectStubsManager,
std::default_delete<llvm::orc::IndirectStubsManager> > ()>::operator()()
const () from /opt/rh/llvm-toolset-6.0/root/usr/lib64/libLLVM-6.0.so
#8  0x000003ffa139f2a8 in LLVMOrcCreateInstance () from
/opt/rh/llvm-toolset-6.0/root/usr/lib64/libLLVM-6.0.so
#9  0x000003ffa9c8a984 in llvm_session_initialize () at llvmjit.c:670
#10 llvm_create_context (jitFlags=<optimized out>) at llvmjit.c:146
#11 0x000003ffa9c98992 in llvm_compile_expr (state=0xa8c52218) at
llvmjit_expr.c:131
#12 0x0000000080219986 in ExecReadyExpr (state=state(at)entry=0xa8c52218)
at execExpr.c:628
#13 0x000000008021cd6e in ExecBuildProjectionInfo (targetList=<optimized
out>, econtext=<optimized out>, slot=<optimized out>,
parent=parent(at)entry=0xa8c51e30, inputDesc=inputDesc(at)entry=0x0) at
execExpr.c:472
#14 0x0000000080232ed6 in ExecAssignProjectionInfo
(planstate=planstate(at)entry=0xa8c51e30, inputDesc=inputDesc(at)entry=0x0) at
execUtils.c:504
#15 0x0000000080250178 in ExecInitResult (node=node(at)entry=0xa8c4fb98,
estate=estate(at)entry=0xa8c51bf0, eflags=eflags(at)entry=16) at nodeResult.c:221
#16 0x000000008022c72c in ExecInitNode (node=node(at)entry=0xa8c4fb98,
estate=estate(at)entry=0xa8c51bf0, eflags=eflags(at)entry=16) at
execProcnode.c:164
#17 0x000000008022675e in InitPlan (eflags=16, queryDesc=0xa8c4f7d0) at
execMain.c:1020
#18 standard_ExecutorStart (queryDesc=0xa8c4f7d0, eflags=16) at
execMain.c:266
#19 0x0000000080388868 in PortalStart (portal=portal(at)entry=0xa8c91c80,
params=params(at)entry=0x0, eflags=eflags(at)entry=0,
snapshot=snapshot(at)entry=0x0) at pquery.c:518
#20 0x0000000080384b2e in exec_simple_query
(query_string=query_string(at)entry=0xa8c06170 "select 5;") at postgres.c:1176
#21 0x00000000803852e0 in PostgresMain (argc=<optimized out>,
argv=argv(at)entry=0xa8c55db8, dbname=0xa8c55c80 "postgres",
username=<optimized out>) at postgres.c:4247
#22 0x000000008008007e in BackendRun (port=<optimized out>,
port=<optimized out>) at postmaster.c:4437
#23 BackendStartup (port=0xa8c4dc10) at postmaster.c:4128
#24 ServerLoop () at postmaster.c:1704
#25 0x000000008030c89e in PostmasterMain (argc=argc(at)entry=3,
argv=argv(at)entry=0xa8c00cc0) at postmaster.c:1377
#26 0x00000000800811f4 in main (argc=<optimized out>, argv=0xa8c00cc0)
at main.c:228

--
regards,tushar
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