We are running: [root@monetdb monetdb5]# mserver5 --version MonetDB 5 server v11.21.19 "Jul2015-SP4" (64-bit, 64-bit oids, 128-bit integers) Copyright (c) 1993-July 2008 CWI Copyright (c) August 2008-2015 MonetDB B.V., all rights reserved Visit http://www.monetdb.org/ for further information Found 503.6GiB available memory, 28 available cpu cores Libraries: libpcre: 8.32 2012-11-30 (compiled with 8.32) openssl: OpenSSL 1.0.1e 11 Feb 2013 (compiled with ) libxml2: 2.9.1 (compiled with 2.9.1) Compiled by: @9bedafc83c11 (x86_64-unknown-linux-gnu) Compilation: gcc -gdwarf-4 -g3 Linking : /usr/bin/ld -m elf_x86_64 When select * from sys.db_users() is executed when logged in as the monetdb user there is no problem, but when run under any other user we get the following stack trace: [Switching to Thread 0x7f418e7f3700 (LWP 26599)] 0x00007f41bd5cf059 in db_users_wrap (cntxt=0x7f41be899630, mb=0x7f412416e620, stk=0x7f4124114bd0, pci=0x7f41241255d0) at sql_user.c:160 160sql_user.c: No such file or directory. (gdb) where #0 0x00007f41bd5cf059 in db_users_wrap (cntxt=0x7f41be899630, mb=0x7f412416e620, stk=0x7f4124114bd0, pci=0x7f41241255d0) at sql_user.c:160 #1 0x00007f41c519f1f7 in runMALsequence (cntxt=0x7f41be899630, mb=0x7f412416e620, startpc=1, stoppc=0, stk=0x7f4124114bd0, env=0x0, pcicaller=0x0) at mal_interpreter.c:631 #2 0x00007f41c519e819 in callMAL (cntxt=0x7f41be899630, mb=0x7f412416e620, env=0x7f418e7f2a68, argv=0x7f418e7f2af0, debug=0 '\000') at mal_interpreter.c:447 #3 0x00007f41bd5d50d6 in SQLexecutePrepared (c=0x7f41be899630, be=0x7f41242417f0, q=0x7f4124117740) at sql_execute.c:328 #4 0x00007f41bd5d54c9 in SQLengineIntern (c=0x7f41be899630, be=0x7f41242417f0) at sql_execute.c:390 #5 0x00007f41bd5d4257 in SQLengine (c=0x7f41be899630) at sql_scenario.c:1323 #6 0x00007f41c51bcaf7 in runPhase (c=0x7f41be899630, phase=4) at mal_scenario.c:515 #7 0x00007f41c51bccb4 in runScenarioBody (c=0x7f41be899630) at mal_scenario.c:559 #8 0x00007f41c51bcda1 in runScenario (c=0x7f41be899630) at mal_scenario.c:579 #9 0x00007f41c51bdcd8 in MSserveClient (dummy=0x7f41be899630) at mal_session.c:439 #10 0x00007f41c51bd8b2 in MSscheduleClient (command=0x7f4124279b90 "p\233'$A\177", challenge=0x7f418e7f2da0 "Up8bNTal6v", fin=0x7f4124117560, fout=0x7f4124241680) at mal_session.c:319 #11 0x00007f41c526d001 in doChallenge (data=0x7f41a0001690) at mal_mapi.c:184 #12 0x00007f41c4bae17f in thread_starter (arg=0x7f41a00008c0) at gdk_system.c:458 #13 0x00007f41c2814dc5 in start_thread () from /lib64/libpthread.so.0 #14 0x00007f41c2541ced in clone () from /lib64/libc.so.6 Thanks, Vince The information transmitted, including any attachments, is intended only for the individual or entity to which it is addressed, and may contain confidential and/or privileged information. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by individuals or entities other than the intended recipient is prohibited, and all liability arising therefrom is disclaimed. If you have received this communication in error, please delete the information from any computer and notify the sender.