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Posted to bugs@httpd.apache.org by bu...@apache.org on 2007/05/21 18:33:49 UTC
DO NOT REPLY [Bug 42473] New: - Apache2 problem with MaxClient and/or TimeOut
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Summary: Apache2 problem with MaxClient and/or TimeOut
Product: Apache httpd-2
Version: 2.0.54
Platform: Other
OS/Version: Linux
Status: NEW
Severity: blocker
Priority: P1
Component: prefork
AssignedTo: bugs@httpd.apache.org
ReportedBy: borja.pacheco@juntadeandalucia.es
Dear all,
we have a webmail platform based on Reverse Proxies + Apache + Squirrelmail.
Lately we updated Apache's from 1.3.x to 2.0.54 (using standard Sarge Debian
packages), since this update, we are watching that Apache reaches MaxClients
often (once or twice daily), and the only one way to restore the service is to
restart the daemon.
Luckly, we have been able to test a "hanged-up" server, and we made several
test/meassures:
1. We noticed that MaxClients works, because it's configured to manage X clients
and there're X processes runing into de OS.
2. We watched that we had X established connections too.
At this point everything looks fine, but there are a few strange things...
3. The connection among reverse proxy and apaches didn't carry data, just ACKs.
Why isn't TimeOut rejecting this connections?
4. In order to verify who's working bad Apache or Proxies (Although the haven't
been cahnged during the update), we inserted a rule into the firewall rejecting
any input packet to the webserver.
Result: connections became closed, but only after 45 minutes (and our TimeOut is
configured in 120 seconds...!)
5. Once connections closed, we hoped that processes should be removed, and the
server will start to accept new incoming requests. Not as expected, the server
is still "hanged-up".
Data:
MDM: Prefork
ii apache-common 1.3.33-6sarge3 support files for all Apache webservers
ii apache2 2.0.54-5sarge1 next generation, scalable, extendable web se
ii apache2-common 2.0.54-5sarge1 next generation, scalable, extendable web se
ii apache2-mpm-pr 2.0.54-5sarge1 traditional model for Apache2
ii apache2-utils 2.0.54-5sarge1 utility programs for webservers
ii libapache2-mod 4.3.10-19 server-side, HTML-embedded scripting languag
LockFile /var/lock/apache2/accept.lock
PidFile /var/run/apache2.pid
Timeout 120
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 15
ServerTokens Prod
<IfModule prefork.c>
StartServers 10
MinSpareServers 10
MaxSpareServers 15
MaxClients 25
MaxRequestsPerChild 1000
</IfModule>
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DO NOT REPLY [Bug 42473] - Apache2 problem with MaxClient and/or TimeOut
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------- Additional Comments From borja.pacheco@juntadeandalucia.es 2007-05-22 02:25 -------
While I try to execute gdb, another detail...
This is the strace of a child process on a server which's at this moment working
fine. Here there's not lock.
Is this a clue?
# strace -p 22084
Process 22084 attached - interrupt to quit
semop(622594, 0x4030e7ec, 1 <unfinished ...>
Process 22084 detached
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DO NOT REPLY [Bug 42473] - Apache2 problem with MaxClient and/or TimeOut
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------- Additional Comments From borja.pacheco@juntadeandalucia.es 2007-05-22 01:10 -------
Debug info...
#ps -ef | grep apache
root 5224 1 0 May20 ? 00:00:02 /usr/sbin/apache2 -k start -DSSL
Debian- 5171 5224 0 May21 ? 00:00:00 /usr/sbin/apache2 -k start -DSSL
Debian- 5183 5224 0 May21 ? 00:00:01 /usr/sbin/apache2 -k start -DSSL
// ***************************************************
// PSTACK
// ***************************************************
It's seems that there aren't symbols into binaries included into Debian package,
so, there's no inof here, isn't there?
#pstack 5224
5224: /usr/sbin/apache2 -k start -DSSL
(No symbols found)
0x4042b9f8: ???? (f4240, 0, bffff118, 1, 80b00a8, c)
0x08084598: ???? (bffff118, bffff11c, bffff120, 80b00a8, 80b4b78, 809c495) + 40
0x08077042: ???? (80b00a8, 80e6180, 80b4b78, 80b4b78, bffff194, 403651a8) + 40
0x0807da8d: ???? (4, bffff234, bffff248, 0, 4048bf40, 40016540) + 40
0x4036f974: ???? (807d3c0, 4, bffff234, 80948e0, 8094940, 4000c380) + 40000dd8
# pstack 5183
5183: /usr/sbin/apache2 -k start -DSSL
(No symbols found)
0x40424ca1: ???? (8225c8c, 824dae4, bfffa048, 40726945, 8235574, 40883dc1) + 80
0x406713eb: ???? (408cc3f0, 824dae4, bfffa0b4, bfffa0b8, 824dae4, 82a95ec) + 10
0x4066d656: ???? (82a95ec, 20, a, bfffa100, 0, bfffa104) + 30
0x4066ebe0: ???? (408c8274, 8c)
0x40670660: ???? (0, 824db1c, 0, 0, 4, bfffa14c) + 2a0
0x407331c0: ???? (824d9e8, 0, 0, 4071a600, 0, 0) + bf0
0x40732f25: ???? (824da4c, 8, 2d, bfffb808, 4, 0) + 8e0
0x40734614: ???? (821634c, 8, 2b, bfffca88, 4, 0) + 1260
0x40734614: ???? (8227c94, 2, 408d03e0, 827e990, 1, bfffcbc4) + 10
0x40722db1: ???? (8, 0, 3, 0, bfffedc0, 0) + 2120
0x406f4ebf: ???? (bfffedc0, 820ed10, 40737c30, 80606c8, 0, bfffebf8) + 1b0
0x4073834f: ???? (820c5b0, 80b5868, 0, 820c5b0, 820c5b0, 8128cb0)
0x08078375: ???? (820c5b0, 3b, 81e792c, 820c5b0, 0, 81e78e8) + 20
0x08078980: ???? (820c5b0, 0, 4, 820c5b0, 81e78e8, 820c5b0)
0x08069c6a: ???? (820c5b0, 4, 820c5b0, 808370c, 81e78e8, 81e7810) + 10
0x0806512d: ???? (81e78e8, 81e7810, 2, 81e5890, 81e78e8, 8206560)
0x080835c5: ???? (81e78e8, 81e7810, 81e7810, 18, 81e5848, 8206560) + 30
0x08076974: ???? (18, 1, 1, 0, 1, 816f120) + 10
0x08076ac7: ???? (80b4b78, 18, 40399c4, 40016ed8, 805957d, bffff074) + c0
0x08076d59: ???? (80b00a8, bffff11c, bffff120, 80b00a8, 80b4b78, 809c495) + 40
0x08077445: ???? (80b00a8, 80e6180, 80b4b78, 80b4b78, bffff194, 403651a8) + 40
0x0807da8d: ???? (4, bffff234, bffff248, 0, 4048bf40, 40016540) + 40
0x4036f974: ???? (807d3c0, 4, bffff234, 80948e0, 8094940, 4000c380) + 40000dd8
// ***************************************************
// STRACE
// ***************************************************
The process outputs these calls, and it doesn't change when I try making a
connection to the httpd process
# strace -p 5224
Process 5224 attached - interrupt to quit
select(0, NULL, NULL, NULL, {0, 920000}) = 0 (Timeout)
waitpid(-1, 0xbffff090, WNOHANG|WUNTRACED) = 0
select(0, NULL, NULL, NULL, {1, 0}) = 0 (Timeout)
waitpid(-1, 0xbffff090, WNOHANG|WUNTRACED) = 0
select(0, NULL, NULL, NULL, {1, 0}) = 0 (Timeout)
waitpid(-1, 0xbffff090, WNOHANG|WUNTRACED) = 0
select(0, NULL, NULL, NULL, {1, 0}) = 0 (Timeout)
waitpid(-1, 0xbffff090, WNOHANG|WUNTRACED) = 0
select(0, NULL, NULL, NULL, {1, 0}) = 0 (Timeout)
waitpid(-1, 0xbffff090, WNOHANG|WUNTRACED) = 0
select(0, NULL, NULL, NULL, {1, 0} <unfinished ...>
Process 5224 detached
Child seems to be more interesting. It looks like locked...
# strace -p 5183
Process 5183 attached - interrupt to quit
flock(27, LOCK_EX
Must I perform any other debug command?
Thanks in advance.
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DO NOT REPLY [Bug 42473] - Apache2 problem with MaxClient and/or TimeOut
Posted by bu...@apache.org.
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------- Additional Comments From borja.pacheco@juntadeandalucia.es 2007-05-22 03:29 -------
Thanks a lot for your clarifications.
Here it is...
# gdb /usr/sbin/apache2 5183
GNU gdb 6.3-debian
Copyright 2004 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-linux"...(no debugging symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".
Attaching to program: /usr/sbin/apache2, process 5183
(no debugging symbols found)
`system-supplied DSO at 0xffffe000' has disappeared; keeping its symbols.
Reading symbols from /lib/tls/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libdl.so.2
Reading symbols from /lib/tls/libcrypt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libcrypt.so.1
Reading symbols from /usr/lib/libpcre.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpcre.so.3
Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /usr/lib/i686/cmov/libssl.so.0.9.7...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i686/cmov/libssl.so.0.9.7
Reading symbols from /usr/lib/i686/cmov/libcrypto.so.0.9.7...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/i686/cmov/libcrypto.so.0.9.7
Reading symbols from /usr/lib/libaprutil-0.so.0...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/libaprutil-0.so.0
Reading symbols from /usr/lib/libldap_r.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libldap_r.so.2
Reading symbols from /usr/lib/liblber.so.2...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/liblber.so.2
Reading symbols from /usr/lib/libdb-4.2.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libdb-4.2.so
Reading symbols from /usr/lib/libexpat.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libexpat.so.1
Reading symbols from /usr/lib/libapr-0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libapr-0.so.0
Reading symbols from /lib/tls/librt.so.1...
(no debugging symbols found)...done.
Loaded symbols for /lib/tls/librt.so.1
Reading symbols from /lib/tls/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libm.so.6
Reading symbols from /lib/tls/libnsl.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libnsl.so.1
Reading symbols from /lib/tls/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
[New Thread 1079503776 (LWP 5183)]
Loaded symbols for /lib/tls/libpthread.so.0
Reading symbols from /lib/tls/libc.so.6...
(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/tls/libresolv.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libresolv.so.2
Reading symbols from /usr/lib/libsasl2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libsasl2.so.2
Reading symbols from /usr/lib/libgnutls.so.11...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnutls.so.11
Reading symbols from /usr/lib/libtasn1.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libtasn1.so.2
Reading symbols from /usr/lib/libgcrypt.so.11...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgcrypt.so.11
Reading symbols from /usr/lib/libgpg-error.so.0...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/libgpg-error.so.0
Reading symbols from /lib/tls/libnss_files.so.2...
(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libnss_files.so.2
Reading symbols from /usr/lib/apache2/modules/mod_mime_magic.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_mime_magic.so
Reading symbols from /usr/lib/apache2/modules/mod_expires.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_expires.so
Reading symbols from /usr/lib/apache2/modules/mod_deflate.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_deflate.so
Reading symbols from /usr/lib/apache2/modules/mod_vhost_alias.so...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_vhost_alias.so
Reading symbols from /usr/lib/apache2/modules/mod_userdir.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_userdir.so
Reading symbols from /usr/lib/apache2/modules/mod_rewrite.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_rewrite.so
Reading symbols from /usr/lib/apache2/modules/mod_ssl.so...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_ssl.so
Reading symbols from /usr/lib/apache2/modules/libphp4.so...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/libphp4.so
Reading symbols from /usr/lib/libzzip-0.so.12...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libzzip-0.so.12
Reading symbols from /usr/lib/libbz2.so.1.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libbz2.so.1.0
Reading symbols from /usr/lib/libgssapi_krb5.so.2...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/libgssapi_krb5.so.2
Reading symbols from /usr/lib/libkrb5.so.3...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libkrb5.so.3
Reading symbols from /usr/lib/libk5crypto.so.3...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/libk5crypto.so.3
Reading symbols from /lib/libcom_err.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libcom_err.so.2
Reading symbols from /usr/lib/apache2/modules/mod_unique_id.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_unique_id.so
Reading symbols from /usr/lib/php4/20020429/ldap.so...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/php4/20020429/ldap.so
Reading symbols from /usr/lib/php4/20020429/apc.so...done.
Loaded symbols for /usr/lib/php4/20020429/apc.so
Reading symbols from /lib/tls/libnss_compat.so.2...done.
Loaded symbols for /lib/tls/libnss_compat.so.2
Reading symbols from /lib/tls/libnss_nis.so.2...done.
Loaded symbols for /lib/tls/libnss_nis.so.2
Reading symbols from /lib/libnss_ldap.so.2...done.
Loaded symbols for /lib/libnss_ldap.so.2
Reading symbols from /usr/lib/sasl2/libsasldb.so.2...done.
Loaded symbols for /usr/lib/sasl2/libsasldb.so.2
Reading symbols from /lib/tls/libnss_dns.so.2...done.
Loaded symbols for /lib/tls/libnss_dns.so.2
0x40424ca1 in flock () from /lib/tls/libc.so.6
(gdb) where
#0 0x40424ca1 in flock () from /lib/tls/libc.so.6
#1 0x40670f87 in zm_info_session () from /usr/lib/apache2/modules/libphp4.so
#2 0x406713eb in ps_read_files () from /usr/lib/apache2/modules/libphp4.so
#3 0x4066d656 in php_session_create_id () from /usr/lib/apache2/modules/libphp4.so
#4 0x4066ebe0 in php_session_start () from /usr/lib/apache2/modules/libphp4.so
#5 0x40670660 in zif_session_start () from /usr/lib/apache2/modules/libphp4.so
#6 0x407331c0 in execute () from /usr/lib/apache2/modules/libphp4.so
#7 0x40732f25 in execute () from /usr/lib/apache2/modules/libphp4.so
#8 0x40734614 in execute () from /usr/lib/apache2/modules/libphp4.so
#9 0x40734614 in execute () from /usr/lib/apache2/modules/libphp4.so
#10 0x40722db1 in zend_execute_scripts () from /usr/lib/apache2/modules/libphp4.so
#11 0x406f4ebf in php_execute_script () from /usr/lib/apache2/modules/libphp4.so
#12 0x4073834f in execute () from /usr/lib/apache2/modules/libphp4.so
#13 0x08078375 in ap_run_handler ()
#14 0x08078980 in ap_invoke_handler ()
#15 0x08069c6a in ap_process_request ()
#16 0x0806512d in _start ()
#17 0x0820c5b0 in ?? ()
#18 0x00000004 in ?? ()
#19 0x0820c5b0 in ?? ()
#20 0x0808370c in ap_run_pre_connection ()
#21 0x080835c5 in ap_run_process_connection ()
#22 0x08076974 in ap_graceful_stop_signalled ()
#23 0x08076ac7 in ap_graceful_stop_signalled ()
#24 0x08076d59 in ap_graceful_stop_signalled ()
#25 0x08077445 in ap_mpm_run ()
#26 0x0807da8d in main ()
(gdb) thread apply all bt full
Thread 1 (Thread 1079503776 (LWP 5183)):
#0 0x40424ca1 in flock () from /lib/tls/libc.so.6
No symbol table info available.
#1 0x40670f87 in zm_info_session () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#2 0x406713eb in ps_read_files () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#3 0x4066d656 in php_session_create_id () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#4 0x4066ebe0 in php_session_start () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#5 0x40670660 in zif_session_start () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#6 0x407331c0 in execute () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#7 0x40732f25 in execute () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#8 0x40734614 in execute () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#9 0x40734614 in execute () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#10 0x40722db1 in zend_execute_scripts () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#11 0x406f4ebf in php_execute_script () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#12 0x4073834f in execute () from /usr/lib/apache2/modules/libphp4.so
No symbol table info available.
#13 0x08078375 in ap_run_handler ()
No symbol table info available.
#14 0x08078980 in ap_invoke_handler ()
No symbol table info available.
#15 0x08069c6a in ap_process_request ()
No symbol table info available.
#16 0x0806512d in _start ()
No symbol table info available.
#17 0x0820c5b0 in ?? ()
No symbol table info available.
#18 0x00000004 in ?? ()
No symbol table info available.
---Type <return> to continue, or q <return> to quit---
#19 0x0820c5b0 in ?? ()
No symbol table info available.
#20 0x0808370c in ap_run_pre_connection ()
No symbol table info available.
#21 0x080835c5 in ap_run_process_connection ()
No symbol table info available.
#22 0x08076974 in ap_graceful_stop_signalled ()
No symbol table info available.
#23 0x08076ac7 in ap_graceful_stop_signalled ()
No symbol table info available.
#24 0x08076d59 in ap_graceful_stop_signalled ()
No symbol table info available.
#25 0x08077445 in ap_mpm_run ()
No symbol table info available.
#26 0x0807da8d in main ()
No symbol table info available.
#0 0x40424ca1 in flock () from /lib/tls/libc.so.6
(gdb) quit
The program is running. Quit anyway (and detach it)? (y or n) y
Detaching from program: /usr/sbin/apache2, process 5183
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DO NOT REPLY [Bug 42473] - Apache2 problem with MaxClient and/or TimeOut
Posted by bu...@apache.org.
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |RESOLVED
Resolution| |INVALID
------- Additional Comments From rpluem@apache.org 2007-05-22 12:17 -------
Thanks for the backtrace. First of all the backtrace proves my initial thoughts:
You are stuck in PHP land. This might be a bug in PHP, in your PHP configuration
or in your PHP application. I don't know. So please try to report this to
bugs.php.net or to squirrelmail to obtain further help.
>From a first glance I would guess that the problem is related to PHP's session
management via files and the needed locks during these operations. It might make
sense for you to obtain backtraces from *any* child process in this situation to
get a better impression
1. if all processes are waiting for one specific process
2. what the process holding the lock is actually doing.
You might be able to find the process that holds the lock via
lsof | egrep "[0-9][a-zA-Z][a-zA-Z] "
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------- Additional Comments From rpluem@apache.org 2007-05-22 02:04 -------
Without symbols it is nearly impossible to track this. Furthermore please use
gdb to obtain a backtrace as described on
http://httpd.apache.org/dev/debugging.html.
You only need to analyse the stuck non-root processes. The process running under
root is of no interest here.
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------- Additional Comments From borja.pacheco@juntadeandalucia.es 2007-05-23 02:29 -------
Thanks a lot for your effort.
Regards.
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
------- Additional Comments From rpluem@apache.org 2007-05-21 14:14 -------
This might be a problem with PHP / Squirrelmail. Please try to obtain backtraces
from "hanging" processes (see http://httpd.apache.org/dev/debugging.html).
You might misread the meaning of Timeout in httpd. Timeout here means the
maximum amount of time httpd waits to *write* data to or to *read* data from the
network. If you are using PHP via mod_php (running as a CGI is a different
story) and your php script simply generates no output httpd will keep the
connection open forever which works as designed as there is nothing to read from
the network for httpd (we are sending the response) and there is nothing to
write to the network (since the script produces no output). The
max_execution_time setting in PHP is used to prevent such long running scripts.
I cannot tell you if this works reliable.
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------- Additional Comments From borja.pacheco@juntadeandalucia.es 2007-05-22 00:53 -------
Additional information....
This is the variable of the max_execution_time...
php.ini:max_execution_time = 30 ; Maximum execution time of each script, in
seconds
As you could see, after 30 seconds the execution should be turned off, and
processes being released, but it didn't happen.
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------- Additional Comments From borja.pacheco@juntadeandalucia.es 2007-05-22 02:34 -------
Questions about gdb:
1. Should I recompile with symbols before using gdb?
2. Because I can't follow some steps to make a fail, I suppose I should wait
until all my child process get hanged (as at this moment) and then execute gdb
against a child-pid, don't I?
3. Once in debugging mode, which variables do we need to get?
# gdb /usr/sbin/apache2 5183
GNU gdb 6.3-debian
Copyright 2004 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-linux"...(no debugging symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".
Attaching to program: /usr/sbin/apache2, process 5183
(no debugging symbols found)
`system-supplied DSO at 0xffffe000' has disappeared; keeping its symbols.
Reading symbols from /lib/tls/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libdl.so.2
Reading symbols from /lib/tls/libcrypt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libcrypt.so.1
Reading symbols from /usr/lib/libpcre.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpcre.so.3
Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /usr/lib/i686/cmov/libssl.so.0.9.7...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/i686/cmov/libssl.so.0.9.7
Reading symbols from /usr/lib/i686/cmov/libcrypto.so.0.9.7...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/i686/cmov/libcrypto.so.0.9.7
Reading symbols from /usr/lib/libaprutil-0.so.0...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/libaprutil-0.so.0
Reading symbols from /usr/lib/libldap_r.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libldap_r.so.2
Reading symbols from /usr/lib/liblber.so.2...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/liblber.so.2
Reading symbols from /usr/lib/libdb-4.2.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libdb-4.2.so
Reading symbols from /usr/lib/libexpat.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libexpat.so.1
Reading symbols from /usr/lib/libapr-0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libapr-0.so.0
Reading symbols from /lib/tls/librt.so.1...
(no debugging symbols found)...done.
Loaded symbols for /lib/tls/librt.so.1
Reading symbols from /lib/tls/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libm.so.6
Reading symbols from /lib/tls/libnsl.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libnsl.so.1
Reading symbols from /lib/tls/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
[New Thread 1079503776 (LWP 5183)]
Loaded symbols for /lib/tls/libpthread.so.0
Reading symbols from /lib/tls/libc.so.6...
(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/tls/libresolv.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libresolv.so.2
Reading symbols from /usr/lib/libsasl2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libsasl2.so.2
Reading symbols from /usr/lib/libgnutls.so.11...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnutls.so.11
Reading symbols from /usr/lib/libtasn1.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libtasn1.so.2
Reading symbols from /usr/lib/libgcrypt.so.11...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgcrypt.so.11
Reading symbols from /usr/lib/libgpg-error.so.0...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/libgpg-error.so.0
Reading symbols from /lib/tls/libnss_files.so.2...
(no debugging symbols found)...done.
Loaded symbols for /lib/tls/libnss_files.so.2
Reading symbols from /usr/lib/apache2/modules/mod_mime_magic.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_mime_magic.so
Reading symbols from /usr/lib/apache2/modules/mod_expires.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_expires.so
Reading symbols from /usr/lib/apache2/modules/mod_deflate.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_deflate.so
Reading symbols from /usr/lib/apache2/modules/mod_vhost_alias.so...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_vhost_alias.so
Reading symbols from /usr/lib/apache2/modules/mod_userdir.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_userdir.so
Reading symbols from /usr/lib/apache2/modules/mod_rewrite.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_rewrite.so
Reading symbols from /usr/lib/apache2/modules/mod_ssl.so...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_ssl.so
Reading symbols from /usr/lib/apache2/modules/libphp4.so...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/libphp4.so
Reading symbols from /usr/lib/libzzip-0.so.12...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libzzip-0.so.12
Reading symbols from /usr/lib/libbz2.so.1.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libbz2.so.1.0
Reading symbols from /usr/lib/libgssapi_krb5.so.2...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/libgssapi_krb5.so.2
Reading symbols from /usr/lib/libkrb5.so.3...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libkrb5.so.3
Reading symbols from /usr/lib/libk5crypto.so.3...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/libk5crypto.so.3
Reading symbols from /lib/libcom_err.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libcom_err.so.2
Reading symbols from /usr/lib/apache2/modules/mod_unique_id.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/apache2/modules/mod_unique_id.so
Reading symbols from /usr/lib/php4/20020429/ldap.so...
(no debugging symbols found)...done.
Loaded symbols for /usr/lib/php4/20020429/ldap.so
Reading symbols from /usr/lib/php4/20020429/apc.so...done.
Loaded symbols for /usr/lib/php4/20020429/apc.so
Reading symbols from /lib/tls/libnss_compat.so.2...done.
Loaded symbols for /lib/tls/libnss_compat.so.2
Reading symbols from /lib/tls/libnss_nis.so.2...done.
Loaded symbols for /lib/tls/libnss_nis.so.2
Reading symbols from /lib/libnss_ldap.so.2...done.
Loaded symbols for /lib/libnss_ldap.so.2
Reading symbols from /usr/lib/sasl2/libsasldb.so.2...done.
Loaded symbols for /usr/lib/sasl2/libsasldb.so.2
Reading symbols from /lib/tls/libnss_dns.so.2...done.
Loaded symbols for /lib/tls/libnss_dns.so.2
0x40424ca1 in flock () from /lib/tls/libc.so.6
(gdb)
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------- Additional Comments From rpluem@apache.org 2007-05-22 02:42 -------
(In reply to comment #6)
> Questions about gdb:
>
> 1. Should I recompile with symbols before using gdb?
That would be helpful, but is not strictly needed. You can make a first try with
your current binary.
> 2. Because I can't follow some steps to make a fail, I suppose I should wait
> until all my child process get hanged (as at this moment) and then execute gdb
> against a child-pid, don't I?
Yes, attachg gdb to a hanging process (aka live backtrace). See
http://httpd.apache.org/dev/debugging.html#backtrace
> 3. Once in debugging mode, which variables do we need to get?
Just do
thread apply all bt full
and we get everything that is there and that is needed for the start. If more is
needed it needs to be specified later.
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