Re: Here is my backtrace, please solove my problem
On Sat, Nov 10, 2001 at 12:10:03PM -0800, SubbaReddy M wrote: /soft/Apache-ASP-2.27/make_httpd/mod_perl-1.26/core: No such file or directory. You need a core file to do this... gdb is kindly pointing out that you don't have one. and i am really thankfull for your help. I'm just (repeatedly) telling you to read the manual and think about what you are doing. You need to understand how the debugger, the stack, seg faults, and core dumps work in relation to one another and this list is not the place to learn all that. Sorry, Barrie
Here is my backtrace, please solove my problem
Hello, [root@qclinux mod_perl-1.26]# gdb httpd 14947 GNU gdb 19991004 Copyright 1998 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type show copying to see the conditions. There is absolutely no warranty for GDB. Type show warranty for details. This GDB was configured as i386-redhat-linux... (no debugging symbols found)... /soft/Apache-ASP-2.27/make_httpd/mod_perl-1.26/14947: No such file or directory. Attaching to program: /usr/sbin/httpd, Pid 14947 Reading symbols from /lib/libNoVersion.so.1...done. Reading symbols from /lib/libm.so.6...done. Reading symbols from /lib/libcrypt.so.1...done. Reading symbols from /lib/libdb.so.2...done. Reading symbols from /lib/libdl.so.2...done. Reading symbols from /lib/libc.so.6...done. Reading symbols from /lib/ld-linux.so.2...done. Reading symbols from /lib/libnss_files.so.2...done. Reading symbols from /usr/lib/gconv/ISO8859-1.so...done. Reading symbols from /etc/httpd/modules/mod_vhost_alias.so...done. Reading symbols from /etc/httpd/modules/mod_env.so...done. Reading symbols from /etc/httpd/modules/mod_log_config.so...done. Reading symbols from /etc/httpd/modules/mod_log_agent.so...done. Reading symbols from /etc/httpd/modules/mod_log_referer.so...done. Reading symbols from /etc/httpd/modules/mod_mime.so...done. ---Type return to continue, or q return to quit--- Reading symbols from /etc/httpd/modules/mod_negotiation.so...done. Reading symbols from /etc/httpd/modules/mod_status.so...done. Reading symbols from /etc/httpd/modules/mod_info.so...done. Reading symbols from /etc/httpd/modules/mod_include.so...done. Reading symbols from /etc/httpd/modules/mod_autoindex.so...done. Reading symbols from /etc/httpd/modules/mod_dir.so...done. Reading symbols from /etc/httpd/modules/mod_cgi.so...done. Reading symbols from /etc/httpd/modules/mod_asis.so...done. Reading symbols from /etc/httpd/modules/mod_imap.so...done. Reading symbols from /etc/httpd/modules/mod_actions.so...done. Reading symbols from /etc/httpd/modules/mod_userdir.so...done. Reading symbols from /etc/httpd/modules/mod_alias.so...done. Reading symbols from /etc/httpd/modules/mod_rewrite.so...done. Reading symbols from /etc/httpd/modules/mod_access.so...done. Reading symbols from /etc/httpd/modules/mod_auth.so...done. Reading symbols from /etc/httpd/modules/mod_auth_anon.so...done. Reading symbols from /etc/httpd/modules/mod_auth_db.so...done. Reading symbols from /etc/httpd/modules/mod_digest.so...done. Reading symbols from /etc/httpd/modules/libproxy.so...done. Reading symbols from /etc/httpd/modules/mod_expires.so...done. Reading symbols from /etc/httpd/modules/mod_headers.so...done. Reading symbols from /etc/httpd/modules/mod_usertrack.so...done. Reading symbols from /etc/httpd/modules/mod_setenvif.so...done. ---Type return to continue, or q return to quit--- Reading symbols from /etc/httpd/modules/libperl.so...done. Reading symbols from /lib/libnsl.so.1...done. Reading symbols from /lib/libutil.so.1...done. Reading symbols from /etc/httpd/modules/libphp3.so...done. Reading symbols from /usr/lib/libgd.so.1...done. Reading symbols from /usr/lib/libttf.so.2...done. Reading symbols from /usr/lib/libgdbm.so.2...done. Reading symbols from /lib/libdb.so.3...done. Reading symbols from /usr/lib/libz.so.1...done. Reading symbols from /lib/libpam.so.0...done. Reading symbols from /lib/libresolv.so.2...done. Reading symbols from /usr/lib/apache/pgsql.so...done. Reading symbols from /usr/lib/libpq.so.2.0...done. Reading symbols from /usr/lib/apache/imap.so...done. Reading symbols from /usr/lib/apache/ldap.so...done. Reading symbols from /usr/lib/libldap.so.1...done. Reading symbols from /usr/lib/liblber.so.1...done. Reading symbols from /usr/lib/perl5/5.6.1/i686-linux/auto/SDBM_File/SDBM_File.so ...done. Reading symbols from /usr/lib/perl5/5.6.1/i686-linux/auto/IO/IO.so...done. Reading symbols from /usr/lib/perl5/site_perl/5.6.1/i686-linux/auto/Compress/Zli b/Zlib.so...done. Reading symbols from /usr/lib/perl5/5.6.1/i686-linux/auto/Data/Dumper/Dumper.so. ---Type return to continue, or q return to quit--- ..done. Reading symbols from /usr/lib/perl5/5.6.1/i686-linux/auto/Fcntl/Fcntl.so... done. Reading symbols from /usr/lib/perl5/site_perl/5.6.1/i686-linux/auto/Digest/MD5/M D5.so...done. Reading symbols from /usr/lib/perl5/site_perl/5.6.1/i686-linux/auto/Time/HiRes/H iRes.so...done. 0x4012817e in __select () from /lib/libc.so.6 (gdb) where #0 0x4012817e in __select () from /lib/libc.so.6 #1 0x0 in ?? () (gdb) source mod_perl-1.26/.gdbinit mod_perl-1.26/.gdbinit: No such file or directory. (gdb) source mod_perl-1.26/.gdbinit mod_perl-1.26/.gdbinit: No such file or directory. (gdb) curinfo Attempt to extract a component of a value that is not a structure pointer. (gdb) q The program is running. Quit anyway (and detach it)? (y or n) n Not confirmed. (gdb) install Undefined
Re: Here is my backtrace, please solove my problem
This is, i am geting. [root@qclinux mod_perl-1.26]# gdb httpd core GNU gdb 19991004 Copyright 1998 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type show copying to see the conditions. There is absolutely no warranty for GDB. Type show warranty for details. This GDB was configured as i386-redhat-linux...(no debugging symbols found)... /soft/Apache-ASP-2.27/make_httpd/mod_perl-1.26/core: No such file or directory. (gdb) bt No stack. (gdb) /bt Undefined command: . Try help. (gdb) continue The program is not being run. (gdb) run -X -f `pwd`/t/conf/httpd.conf -d `pwd`/t Starting program: /usr/sbin/httpd -X -f `pwd`/t/conf/httpd.conf -d `pwd`/t Ouch! ap_mm_create(1048576, /soft/Apache-ASP-2.27/make_httpd/mod_perl-1.26/t/tmp/mm.19659) failed Error: MM: mm:core: failed to open semaphore file (No such file or directory): OS: No such file or directory Program exited with code 01. (gdb) Quit (gdb) bt No stack. (gdb) and i am really thankfull for your help. -SubbaReddy - Original Message - From: Barrie Slaymaker [EMAIL PROTECTED] To: SubbaReddy M [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Friday, November 09, 2001 10:09 PM Subject: Re: Here is my backtrace, please solove my problem [Note the Reply-To] You're getting closer. Unfortunately, the backtrace you sent says that gdb attached to a running httpd and it happened to be sitting in select() when gdb attached on to it. At which point you grabbed the backtrace and exited, killing the httpd before recreating the problem. Instead, you need to cause the problem while debugging the httpd and, assuming it segfaults when in gdb, get the backtrace from where the problem occurred. Try the first recipe from SUPPORT: % cd mod_perl-x.xx % touch t/conf/srm.conf % gdb ../apache_x.xx/src/httpd (gdb) run -X -f `pwd`/t/conf/httpd.conf -d `pwd`/t [now make request that causes core dump] (gdb) bt or do what you did but gdb's 'continue' command to get the httpd to run again and make the offending request over and over until you get it to seg fault, *then* do the 'where'/'bt' command. The stack trace needs to be from the point of failure, not from some place in a (so far) healthy server... If you have a core file from the segfault, you can also do that recipe from SUPPORT: % gdb httpd core and do the 'bt' that's often a bit easier. - Barrie
