Date: Fri, 28 Jul 2000 07:09:20 -0700 (PDT) From: jym@bsdfr.org To: freebsd-gnats-submit@FreeBSD.org Subject: gnu/20253: [critical] O2 optimization with egcs 2.95.2 (19991024) cause segfault Message-ID: <20000728140920.74EB837C210@hub.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 20253 >Category: gnu >Synopsis: [critical] O2 optimization with egcs 2.95.2 (19991024) cause segfault >Confidential: no >Severity: critical >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Jul 28 07:10:01 PDT 2000 >Closed-Date: >Last-Modified: >Originator: Jean-Yves Moulin >Release: FreeBSD 4.1-STABLE >Organization: waycom >Environment: FreeBSD pulsar.waycom.net 4.1-STABLE FreeBSD 4.1-STABLE #7: Thu Jul 27 15:04:46 CEST 2000 root@pulsar.waycom.net:/usr/src/sys/compile/PULSAR i386 >Description: When I try to use egcs version 2.95.2 19991024 with -O2 compilation option, program cause sigsegv randomly. I try to use gdb to debug my program but with no success. An example of gdb output: (gdb) run Starting program: /usr/users/jym/xfdump-0.5/./xfdump (no debugging symbols found)...(no debugging symbols found)... (no debugging symbols found)...(no debugging symbols found)... Connect to DB... OK => connected at 127.0.0.1 Openning socket... OK => connected at 127.0.0.1:127 New Create 0 Found: 0 Add 0:1 Found: 0 Add 0:2 (no debugging symbols found)...(no debugging symbols found)... Program received signal SIGSEGV, Segmentation fault. 0x280ecf21 in isatty () from /usr/lib/libc.so.4 (gdb) where #0 0x280ecf21 in isatty () from /usr/lib/libc.so.4 #1 0x280ed101 in isatty () from /usr/lib/libc.so.4 #2 0x280ed815 in malloc () from /usr/lib/libc.so.4 #3 0x8048e88 in extract_news () Error accessing memory address 0x7c: Bad address. (gdb) Another Example with simple gethostbyname function: (gdb) run Starting program: /usr/users/jym/xfdump-0.5/xfdump (no debugging symbols found)...(no debugging symbols found)... (no debugging symbols found)...(no debugging symbols found)... Connect to DB... OK => connected at localhost (no debugging symbols found)...(no debugging symbols found)... Program received signal SIGSEGV, Segmentation fault. 0x280ecf21 in isatty () from /usr/lib/libc.so.4 (gdb) where #0 0x280ecf21 in isatty () from /usr/lib/libc.so.4 #1 0x280ed101 in isatty () from /usr/lib/libc.so.4 #2 0x280ed815 in malloc () from /usr/lib/libc.so.4 #3 0x280c49a5 in getaddrinfo () from /usr/lib/libc.so.4 #4 0x280c463e in getaddrinfo () from /usr/lib/libc.so.4 #5 0x280c47a8 in getaddrinfo () from /usr/lib/libc.so.4 #6 0x280c3f84 in getaddrinfo () from /usr/lib/libc.so.4 #7 0x280c3231 in res_init () from /usr/lib/libc.so.4 #8 0x280cdec8 in _sethostdnsent () from /usr/lib/libc.so.4 #9 0x280cc6c5 in sethostent () from /usr/lib/libc.so.4 #10 0x280ccc2f in _gethostbyhtname () from /usr/lib/libc.so.4 #11 0x280cc5ac in gethostbyname2 () from /usr/lib/libc.so.4 #12 0x280cc53c in gethostbyname () from /usr/lib/libc.so.4 (gdb) Huhu... I try to recompile the same program without -O2 optimization option and the program work very fine. I try to use gcc 2.8.1 with -O2 compilation option and the program work fine too. Huhu... what's the problem ??? Unknow bug in egcs ?? egcs is in 4.x-RELEASE and STABLE base system... urgl... >How-To-Repeat: I cannot send you my specific program sorry. >Fix: re-install gcc 2.8.1 bug appears in latest dev egcs version ? don't know... >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20000728140920.74EB837C210>