when we start the apache, everything works fine, but after a while (not a fixed
interval or something) the processes start to die due to segfault signal. A few
processes die, and the server gets into a degradation problem, which no process
gets started without exiting with signal 11.

- modules loaded:
LoadModule authz_host_module modules/mod_authz_host.so
LoadModule log_config_module modules/mod_log_config.so
LoadModule headers_module modules/mod_headers.so
LoadModule setenvif_module modules/mod_setenvif.so
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule mime_module modules/mod_mime.so
LoadModule status_module modules/mod_status.so
LoadModule negotiation_module modules/mod_negotiation.so
LoadModule dir_module modules/mod_dir.so
LoadModule alias_module modules/mod_alias.so

- configuration (just used to reproduce, we noted this problem in other
environment):
<VirtualHost loghost:80>
        ProxyRequests Off
        ProxyTimeout 8
        ProxyMaxForwards 2
        ProxyPreserveHost On
        ProxyErrorOverride On

        ProxyPass /server-status  !
        ProxyPass /server-info  !
        ProxyPass /balancer-manager  !
        ProxyPass / balancer://local/ 
        <Proxy balancer://local/>
                Order deny,allow
                Allow from all
                BalancerMember http://localhost:3128 retry=10
                BalancerMember http://localhost:3129 retry=10
        </Proxy>
</VirtualHost>

<VirtualHost localhost:3128>
        DocumentRoot /export/htdocs/test
</VirtualHost>
<VirtualHost localhost:3129>
        DocumentRoot /export/htdocs/test
</VirtualHost>

$ httpd -V
Server version: Apache/2.2.6 (Unix)
Server built:   Oct 28 2007 02:49:07
Server's Module Magic Number: 20051115:5
Server loaded:  APR 1.2.11, APR-Util 1.2.10
Compiled using: APR 1.2.11, APR-Util 1.2.10
Architecture:   32-bit
Server MPM:     Worker
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/worker"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=128
 -D HTTPD_ROOT="/opt/apache-2.2.6"
 -D SUEXEC_BIN="/opt/apache-2.2.6/bin/suexec"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf"

backtrace for the thread that received the signal:

$ gdb httpd -c core.16218
(gdb) thread apply 2 bt full
Thread 2 (process 16225):
#0  0xffffe402 in __kernel_vsyscall ()
No symbol table info available.
#1  0xf7d80af6 in kill () from /lib/libc.so.6
No symbol table info available.
#2  0x080843bb in sig_coredump (sig=16218) at mpm_common.c:1235
No locals.
#3  <signal handler called>
No symbol table info available.
#4  0xf7eed4a8 in apr_pollset_poll (pollset=0x813bc60, timeout=-1, num=0xf4cd443c, 
    descriptors=0xf4cd4438) at poll/unix/epoll.c:251
        ret = 2
        rv = <value optimized out>
#5  0x08092bd9 in listener_thread (thd=0x812bf60, dummy=0x8161fb0) at worker.c:687
        numdesc = 2
        pdesc = (const apr_pollfd_t *) 0x0
        process_slot = <value optimized out>
        tpool = <value optimized out>
        csd = (void *) 0x0
        ptrans = (apr_pool_t *) 0x0
        pollset = (apr_pollset_t *) 0x813bc60
        rv = <value optimized out>
        lr = <value optimized out>
        have_idle_worker = 1
        last_poll_idx = 0
#6  0xf7ef3464 in dummy_worker (opaque=0x812bf60) at threadproc/unix/thread.c:142
No locals.
#7  0xf7e8134b in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#8  0xf7e1565e in clone () from /lib/libc.so.6
No symbol table info available.
#0  0xffffe402 in __kernel_vsyscall ()


I couldn't find anything related in the bugzilla, or in source code (I'm not
familiar with apache source code). If there is anything that is missing, just ask me

thanks in advance