Date: Thu, 10 Nov 2005 12:54:42 +0100 From: =?ISO-8859-1?Q?Johan_Str=F6m?= <johan@stromnet.org> To: Brian Fundakowski Feldman <green@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: Apache2, mod_python and nss_ldap: Coredump... Message-ID: <DF6C784E-375E-46C9-91C1-809FF7F8F2DF@stromnet.org> In-Reply-To: <20051109232546.GP37350@green.homeunix.org> References: <89E441A8-CC50-4F11-BE3E-AE6C384F5305@stromnet.org> <20051109232546.GP37350@green.homeunix.org>
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On 10 nov 2005, at 00.25, Brian Fundakowski Feldman wrote: > On Wed, Nov 09, 2005 at 10:20:26AM +0100, Johan Str=F6m wrote: >> Hi >> >> I got a new 6.0-STABLE box. Rebuilt kernel and world 2 hours ago >> (against RELENG_6), so it should be pretty new. >> >> Im trying to have apache 2.0.55, mod_python 3.1.4 and nss_ldap 239, >> all the latest from ports. >> The problem I have is this: If i have LoadModule python_module >> libexec/apache2/mod_python.so in my httpd.conf, and at the same time >> have either >> "group: files ldap" and/or "passwd: files ldap" in my nsswitch.conf, >> i get Segfaults. Example: >> >> root@elfi2:~$ apachectl configtest >> Syntax OK >> Segmentation fault (core dumped) >> root@elfi2:~$ >> >> However, apache itself is running fine, even using mod_python. >> If i remove either the LoadModule or both the ldap-entrys in >> nsswitch, the segfaults dissappear. I've compiled httpd with debug >> symbols, and this is what I found with gdb (httpd -t is same as >> apachectl configtest): >> [...] >> (gdb) where >> #0 0x00000000 in ?? () >> #1 0x28be6744 in ?? () from /usr/local/lib/nss_ldap.so.1 >> #2 0x28bf2200 in ?? () from /usr/local/lib/nss_ldap.so.1 > > Can you try making sure that nss_ldap gets built and linked with -g, > and is not stripped, so that all symbols and debug info are preserved > as well? Looks to be atexit(3)-related, from here, but the symbols > should clear things up. Hi, thanks for the answer! I *think* i got the nss_ldap.so to not be strip'd, at least I cant =20 find any call in the port Makefile or the sources makefile/configure =20 stuff that would strip it. Same result as before, no new symbols.. =20 Strange? I'm compiling with -g and -O0.. However, I've noticed one thing, if I run gdb httpd and then run -t, =20 I get this: root@elfi2:~$ gdb httpd GNU gdb 6.1.1 [FreeBSD] Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and =20 you are welcome to change it and/or distribute copies of it under certain =20 conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for =20 details. This GDB was configured as "i386-marcel-freebsd"... (gdb) run -t Starting program: /usr/local/sbin/httpd -t warning: Unable to get location for thread creation breakpoint: =20 generic error [New LWP 100128] [New Thread 0x80fa000 (LWP 100128)] wWarning: DocumentRoot [/usr/local/nagios/share] does not exist Syntax OK [New LWP 100128] Program received signal SIGTRAP, Trace/breakpoint trap. [Switching to LWP 100128] 0x28bce277 in pthread_testcancel () from /usr/lib/libpthread.so.2 (gdb) where #0 0x28bce277 in pthread_testcancel () from /usr/lib/libpthread.so.2 Error accessing memory address 0x28bcd7a8: Bad address. (gdb) Thats the pthread_cancel thing I was talking about before... However, if I do run httpd -t and then check the dump with gdb httpd -=20= c httpd.core, I get the same as first posted. Did the test over and over again, got the same pthread_cancel error, =20 reading the same memory address, re-ran httpd -t a couple of times =20 and seems I only get these pthread_cancel calls... Is there any way to check if a lib is strip'd/got debug symbols or not? Thanks Johan
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