Hi again, with the latest MonetDB 4.5.0 on RedHat 8.0 (psyche), Jan (F.;-) experiences a "consistently" hang of the Mserver, once he tries to quit it. See below for details. It did work with older versions of MonetDB, but we hanven't locate more precisely, yet, since which version/code change the hang occurs. My question is, has anybody else ever experienced similar problems? I now vaguely recall, that there might have been some related issue, but I don't remember the details, yet --- could someone who does refresh my mind? Thank you very much in advance! Stefan Forwarded message:

From flokstra@cs.utwente.nl Wed Dec 15 09:30:02 2004 X-Sieve: CMU Sieve 2.2 Content-Type: text/plain; charset="us-ascii" From: Jan Flokstra Organization: University Twente Enschede To: Stefan.Manegold@cwi.nl (Stefan Manegold) Subject: Re: Monet problem Date: Wed, 15 Dec 2004 09:27:45 +0100 User-Agent: KMail/1.4.3 References: <20041213155606.9656241044@draco.ins.cwi.nl> In-Reply-To: <20041213155606.9656241044@draco.ins.cwi.nl> Cc: "Peter Boncz" MIME-Version: 1.0 Old-Content-Transfer-Encoding: quoted-printable Message-Id: <200412150927.47729.flokstra@cs.utwente.nl> X-Spam-Score: -4.9 () BAYES_00 X-Scanned-By: milter-spamc/0.25.320 (styx.cwi.nl [192.16.191.21]); Wed, 15 Dec 2004 09:28:11 +0100 X-Scanned-By: MIMEDefang 2.44 X-Spam-Flag: NO X-Spam-Status: NO, hits=0.00 required=5.00 X-Spam-Level: X-Spam-Report: Content analysis details: (0.0 points, 5.0 required) Tests (points, rulename, description): ____ X-Virus-Scanned: by cwi.nl (CWI/$Revision: 1.25 $) Content-Transfer-Encoding: 8bit

Hi Stefan,

I am using Redhat Linux, version (uname -a)

Linux psyche 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 i686 i386 GNU/Linux

and the default compilers on this version. I made an strace of the Mserver and got the following output (just the tail) It looks it never returns from the rt_sigsuspend() syscall and this is indeed very strange!

Regards, Jan.

brk(0x8175000) = 0x8175000 brk(0x8177000) = 0x8177000 brk(0x8178000) = 0x8178000 brk(0x8179000) = 0x8179000 brk(0x817b000) = 0x817b000 brk(0x817d000) = 0x817d000 brk(0x817f000) = 0x817f000 brk(0x8180000) = 0x8180000 brk(0x8181000) = 0x8181000 brk(0x8182000) = 0x8182000 brk(0x8183000) = 0x8183000 brk(0x8185000) = 0x8185000 brk(0x8186000) = 0x8186000 close(7) = 0 open("/usr/local/flokstra/lib/MonetDB", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 7 fstat64(7, {st_mode=S_IFDIR|0755, st_size=8192, ...}) = 0 fcntl64(7, F_SETFD, FD_CLOEXEC) = 0 lseek(7, 0, SEEK_SET) = 0 getdents64(0x7, 0x80a1b90, 0x1000, 0x4006c4eb) = 4096 open("/usr/local/flokstra/lib/MonetDB/trans.mil", O_RDONLY|O_LARGEFILE) = 8 fstat64(8, {st_mode=S_IFREG|0755, st_size=70, ...}) = 0 fstat64(8, {st_mode=S_IFREG|0755, st_size=70, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4045f000 read(8, "# This module is generated using"..., 4096) = 70 read(8, "", 4096) = 0 close(8) = 0 munmap(0x4045f000, 4096) = 0 close(7) = 0 open("/usr/local/flokstra/lib/MonetDB", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 7 fstat64(7, {st_mode=S_IFDIR|0755, st_size=8192, ...}) = 0 fcntl64(7, F_SETFD, FD_CLOEXEC) = 0 lseek(7, 0, SEEK_SET) = 0 getdents64(0x7, 0x80a1b90, 0x1000, 0x400709c6) = 4096 getdents64(0x7, 0x80a1b90, 0x1000, 0x400709c6) = 2504 open("/usr/local/flokstra/lib/MonetDB/lib_trans.so", O_RDONLY) = 8 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\314\16"..., 1024) = 1024 fstat64(8, {st_mode=S_IFREG|0755, st_size=78034, ...}) = 0 old_mmap(NULL, 16136, PROT_READ|PROT_EXEC, MAP_PRIVATE, 8, 0) = 0x419f7000 mprotect(0x419fa000, 3848, PROT_NONE) = 0 old_mmap(0x419fa000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 8, 0x2000) = 0x419fa000 close(8) = 0 write(1, "MonetDB>", 8MonetDB>) = 8 fstat64(0, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 1), ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4045f000 read(0, quit(); "quit();\n", 1024) = 8 write(6, "\200\20G@\2\0\0\0\0\0\0\0\222\253\0@\304\363\377\277\300"..., 148) = 148 rt_sigprocmask(SIG_SETMASK, NULL, [RTMIN], 8) = 0 rt_sigsuspend([]

-- | Dr. Stefan Manegold | mailto:Stefan.Manegold@cwi.nl | | CWI, P.O.Box 94079 | http://www.cwi.nl/~manegold/ | | 1090 GB Amsterdam | Tel.: +31 (20) 592-4212 | | The Netherlands | Fax : +31 (20) 592-4312 |