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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 37770] - proxy: error reading status line from remote server (null)
Date Sun, 04 Dec 2005 14:20:41 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=37770





------- Additional Comments From cya@nbux.com  2005-12-04 15:20 -------
Hi again,

Here is more informations about the problem, sometimes i even get a segmentation
fault (11) :

I have done some differents stress tests :

1. with a debug LogLevel : no problem (see my last post), i have the problem
only with any other level (warn, notice, info, crit, ...)

2. with others backends servers (simple .html on an apache 2.0.54 instead of a
.jsp on a Tomcat-5.5.12) : no problem. Of course, no error on Tomcat backend
server, and when i bypass reverse proxy, or when i use apache 2.0.55 (instead of
2.2.0 with mod_proxy), i don't get any error.

3. sometimes i get a segmentation fault  and here a trace (i have used .gdbinit
of httpd-2.2.0 directory) :

------------------
gdb /opt/apache22/bin/httpd /tmp/core.7637 
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"...Using host libthread_db library
"/lib/tls/libthread_db.so.1".

Core was generated by `/opt/apache22/bin/httpd -k start'.
Program terminated with signal 11, Segmentation fault.

warning: current_sos: Can't read pathname for load map: Input/output error

Reading symbols from /lib/tls/libm.so.6...done.
Loaded symbols for /lib/tls/libm.so.6
Reading symbols from /opt/apache22/lib/libaprutil-1.so.0...done.
Loaded symbols for /opt/apache22/lib/libaprutil-1.so.0
Reading symbols from /usr/lib/libdb-4.3.so...done.
Loaded symbols for /usr/lib/libdb-4.3.so
Reading symbols from /usr/lib/libexpat.so.1...done.
Loaded symbols for /usr/lib/libexpat.so.1
Reading symbols from /opt/apache22/lib/libapr-1.so.0...done.
Loaded symbols for /opt/apache22/lib/libapr-1.so.0
Reading symbols from /lib/tls/librt.so.1...done.
Loaded symbols for /lib/tls/librt.so.1
Reading symbols from /lib/tls/libcrypt.so.1...done.
Loaded symbols for /lib/tls/libcrypt.so.1
Reading symbols from /lib/tls/libpthread.so.0...done.
Loaded symbols for /lib/tls/libpthread.so.0
Reading symbols from /lib/tls/libdl.so.2...done.
Loaded symbols for /lib/tls/libdl.so.2
Reading symbols from /lib/tls/libc.so.6...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/tls/libnss_compat.so.2...done.
Loaded symbols for /lib/tls/libnss_compat.so.2
Reading symbols from /lib/tls/libnsl.so.1...done.
Loaded symbols for /lib/tls/libnsl.so.1
Reading symbols from /lib/tls/libnss_nis.so.2...done.
Loaded symbols for /lib/tls/libnss_nis.so.2
Reading symbols from /lib/tls/libnss_files.so.2...done.
Loaded symbols for /lib/tls/libnss_files.so.2
Reading symbols from /opt/apache22/modules/mod_authz_host.so...done.
Loaded symbols for /opt/apache22/modules/mod_authz_host.so
Reading symbols from /opt/apache22/modules/mod_dumpio.so...done.
Loaded symbols for /opt/apache22/modules/mod_dumpio.so
Reading symbols from /opt/apache22/modules/mod_include.so...done.
Loaded symbols for /opt/apache22/modules/mod_include.so
Reading symbols from /opt/apache22/modules/mod_log_config.so...done.
Loaded symbols for /opt/apache22/modules/mod_log_config.so
Reading symbols from /opt/apache22/modules/mod_logio.so...done.
Loaded symbols for /opt/apache22/modules/mod_logio.so
Reading symbols from /opt/apache22/modules/mod_env.so...done.
Loaded symbols for /opt/apache22/modules/mod_env.so
Reading symbols from /opt/apache22/modules/mod_expires.so...done.
Loaded symbols for /opt/apache22/modules/mod_expires.so
Reading symbols from /opt/apache22/modules/mod_headers.so...done.
Loaded symbols for /opt/apache22/modules/mod_headers.so
Reading symbols from /opt/apache22/modules/mod_ident.so...done.
Loaded symbols for /opt/apache22/modules/mod_ident.so
Reading symbols from /opt/apache22/modules/mod_usertrack.so...done.
Loaded symbols for /opt/apache22/modules/mod_usertrack.so
Reading symbols from /opt/apache22/modules/mod_unique_id.so...done.
Loaded symbols for /opt/apache22/modules/mod_unique_id.so
Reading symbols from /opt/apache22/modules/mod_setenvif.so...done.
Loaded symbols for /opt/apache22/modules/mod_setenvif.so
Reading symbols from /opt/apache22/modules/mod_version.so...done.
Loaded symbols for /opt/apache22/modules/mod_version.so
Reading symbols from /opt/apache22/modules/mod_proxy.so...done.
Loaded symbols for /opt/apache22/modules/mod_proxy.so
Reading symbols from /opt/apache22/modules/mod_proxy_connect.so...done.
Loaded symbols for /opt/apache22/modules/mod_proxy_connect.so
Reading symbols from /opt/apache22/modules/mod_proxy_http.so...done.
Loaded symbols for /opt/apache22/modules/mod_proxy_http.so
Reading symbols from /opt/apache22/modules/mod_proxy_balancer.so...done.
Loaded symbols for /opt/apache22/modules/mod_proxy_balancer.so
Reading symbols from /opt/apache22/modules/mod_mime.so...done.
Loaded symbols for /opt/apache22/modules/mod_mime.so
Reading symbols from /opt/apache22/modules/mod_status.so...done.
Loaded symbols for /opt/apache22/modules/mod_status.so
Reading symbols from /opt/apache22/modules/mod_autoindex.so...done.
Loaded symbols for /opt/apache22/modules/mod_autoindex.so
Reading symbols from /opt/apache22/modules/mod_asis.so...done.
Loaded symbols for /opt/apache22/modules/mod_asis.so
Reading symbols from /opt/apache22/modules/mod_info.so...done.
Loaded symbols for /opt/apache22/modules/mod_info.so
Reading symbols from /opt/apache22/modules/mod_vhost_alias.so...done.
Loaded symbols for /opt/apache22/modules/mod_vhost_alias.so
Reading symbols from /opt/apache22/modules/mod_dir.so...done.
Loaded symbols for /opt/apache22/modules/mod_dir.so
Reading symbols from /opt/apache22/modules/mod_alias.so...done.
Loaded symbols for /opt/apache22/modules/mod_alias.so
Reading symbols from /opt/apache22/modules/mod_rewrite.so...done.
Loaded symbols for /opt/apache22/modules/mod_rewrite.so
Reading symbols from /opt/apache22/modules/mod_cache.so...done.
Loaded symbols for /opt/apache22/modules/mod_cache.so
Reading symbols from /opt/apache22/modules/mod_mem_cache.so...done.
Loaded symbols for /opt/apache22/modules/mod_mem_cache.so
Reading symbols from /opt/apache22/modules/mod_ssl.so...done.
Loaded symbols for /opt/apache22/modules/mod_ssl.so
Reading symbols from /usr/lib/i686/cmov/libssl.so.0.9.8...done.
Loaded symbols for /usr/lib/i686/cmov/libssl.so.0.9.8
Reading symbols from /usr/lib/i686/cmov/libcrypto.so.0.9.8...done.
Loaded symbols for /usr/lib/i686/cmov/libcrypto.so.0.9.8
Reading symbols from /usr/lib/libz.so.1...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /lib/libgcc_s.so.1...done.
Loaded symbols for /lib/libgcc_s.so.1
Reading symbols from /lib/tls/libnss_dns.so.2...done.
Loaded symbols for /lib/tls/libnss_dns.so.2
Reading symbols from /lib/tls/libresolv.so.2...done.
Loaded symbols for /lib/tls/libresolv.so.2
#0  0xb7dc43f1 in __read_nocancel () from /lib/tls/libpthread.so.0
(gdb) bt
#0  0xb7dc43f1 in __read_nocancel () from /lib/tls/libpthread.so.0
#1  0x08085ea7 in ap_mpm_pod_check (pod=0xfffffe00) at pod.c:54
#2  0x08083f69 in child_main (child_num_arg=Variable "child_num_arg" is not
available.
) at worker.c:1233
#3  0x080840d0 in make_child (s=0x80a7d88, slot=0) at worker.c:1316
#4  0x0808417b in startup_children (number_to_start=2) at worker.c:1350
#5  0x08084ce1 in ap_mpm_run (_pconf=0x80a60a8, plog=0x80d4160, s=0x80a7d88) at
worker.c:1700
#6  0x08061bef in main (argc=3, argv=0xbfe76ca4) at main.c:712
(gdb) frame 2
#2  0x08083f69 in child_main (child_num_arg=Variable "child_num_arg" is not
available.
) at worker.c:1233
1233                rv = ap_mpm_pod_check(pod);
(gdb) dump_brigade b
No symbol "b" in current context.
(gdb) dump_filters f
No symbol "f" in current context.
--------------------------------




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