#79 Segmentation fault in mmcache_clean_shutdown

[Ole Dalgaard]

On an old old redhat I get a lot of these errors in
error_log:

[Tue Feb 10 20:18:13 2004] [notice] child pid 20220
exit signal Segmentation fault (11)
[Tue Feb 10 20:18:14 2004] [notice] child pid 20219
exit signal Segmentation fault (11)
[Tue Feb 10 20:18:15 2004] [notice] child pid 20129
exit signal Segmentation fault (11)
[Tue Feb 10 20:22:04 2004] [notice] child pid 20257
exit signal Segmentation fault (11)
[Tue Feb 10 20:22:08 2004] [notice] child pid 20256
exit signal Segmentation fault (11)
[Tue Feb 10 20:22:10 2004] [notice] child pid 20255
exit signal Segmentation fault (11)
[Tue Feb 10 20:22:12 2004] [notice] child pid 20254
exit signal Segmentation fault (11)
[Tue Feb 10 20:22:13 2004] [notice] child pid 20253
exit signal Segmentation fault (11)
[Tue Feb 10 20:22:14 2004] [notice] child pid 20252
exit signal Segmentation fault (11)
[Tue Feb 10 20:25:34 2004] [notice] child pid 20296
exit signal Segmentation fault (11)

GDB shows it happens during apache instance shutdown:

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This GDB was configured as "i386-redhat-linux"...

/usr/local/17496: No such file or directory.
Attaching to program: /pack/apache/bin/httpd, Pid 17496
Reading symbols from /lib/libpam.so.0...done.
Reading symbols from /usr/lib/libpspell.so.4...done.
Reading symbols from /usr/lib/libpq.so.2...done.
Reading symbols from
/pack/mysql-3.23.46/lib/mysql/libmysqlclient.so.10...done.
Reading symbols from /usr/lib/libldap.so.2...done.
Reading symbols from /usr/lib/liblber.so.2...done.
Reading symbols from /usr/lib/libgd.so.1...done.
Reading symbols from /usr/lib/libfreetype.so.6...done.
Reading symbols from /usr/lib/libpng.so.2...done.
Reading symbols from /usr/lib/libz.so.1...done.
Reading symbols from /usr/lib/libjpeg.so.62...done.
Reading symbols from /lib/libcrypt.so.1...done.
Reading symbols from /lib/libresolv.so.2...done.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libdl.so.2...done.
Reading symbols from /lib/libnsl.so.1...done.
Reading symbols from /lib/libdb.so.3...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /usr/lib/libltdl.so.3...done.
Reading symbols from
/usr/lib/libpspell-modules.so.1...done.
Reading symbols from
/usr/lib/libstdc++-libc6.1-1.so.2...done.
Reading symbols from /usr/lib/libssl.so.0...done.
Reading symbols from /usr/lib/libcrypto.so.0...done.
Reading symbols from /usr/kerberos/lib/libkrb5.so.2...done.
Reading symbols from
/usr/kerberos/lib/libk5crypto.so.2...done.
Reading symbols from
/usr/kerberos/lib/libcom_err.so.3...done.
Reading symbols from /usr/lib/libsasl.so.7...done.
Reading symbols from /usr/lib/libttf.so.2...done.
Reading symbols from /usr/X11R6/lib/libXpm.so.4...done.
Reading symbols from /usr/X11R6/lib/libX11.so.6...done.
Reading symbols from /lib/ld-linux.so.2...done.
Reading symbols from /lib/libnss_files.so.2...done.
Reading symbols from /lib/libnss_dns.so.2...done.
Reading symbols from
/pack/apache-1.3.22/libexec/mod_caucho.so...done.
Reading symbols from /pack/apache/libexec/libdav.so...done.
Reading symbols from
/usr/local/lib/php/extensions/no-debug-non-zts-20020429/mmcache.so...done.
Reading symbols from /usr/lib/gconv/ISO8859-1.so...done.
0x402da0b4 in semop () at
../sysdeps/unix/sysv/linux/semop.c:35
35 ../sysdeps/unix/sysv/linux/semop.c: No such
file or directory.
(gdb) cont
Continuing.

Program received signal SIGUSR1, User defined signal 1.
0x402da0b4 in semop () at
../sysdeps/unix/sysv/linux/semop.c:35
35 in ../sysdeps/unix/sysv/linux/semop.c
(gdb) bt
#0 0x402da0b4 in semop () at
../sysdeps/unix/sysv/linux/semop.c:35
#1 0x8144c32 in accept_mutex_on_sysvsem ()
#2 0x8146dd1 in child_main ()
#3 0x8147296 in make_child ()
#4 0x8147552 in perform_idle_server_maintenance ()
#5 0x8147966 in standalone_main ()
#6 0x8147dff in main ()
#7 0x4023f9cb in __libc_start_main () at
../sysdeps/generic/libc-start.c:122
(gdb) cont
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x406b1024 in mmcache_clean_shutdown () from
/usr/local/lib/php/extensions/no-debug-non-zts-20020429/mmcache.so
(gdb) bt
#0 0x406b1024 in mmcache_clean_shutdown () from
/usr/local/lib/php/extensions/no-debug-non-zts-20020429/mmcache.so
Cannot access memory at address 0x406b1024.
(gdb)

[Nobody/Anonymous]

Logged In: NO

Happens for me too.. everytime I RELOAD Apache (V2)

[Aman Gupta]

Logged In: YES
user_id=338529

Same problem here:

Program received signal SIGSEGV, Segmentation fault.
0x000000000045303e in _efree ()
(gdb) bt
#0 0x000000000045303e in _efree ()
#1 0x0000002a96e076fb in mmcache_clean_request ()
from
/usr/lib/php/extensions/no-debug-non-zts-20020429/mmcache.so
#2 0x0000002a96e04170 in zm_deactivate_mmcache ()
from
/usr/lib/php/extensions/no-debug-non-zts-20020429/mmcache.so
#3 0x00000000004653d3 in module_registry_cleanup ()
#4 0x000000000046789f in zend_hash_apply ()
#5 0x0000000000461fdf in zend_deactivate_modules ()
#6 0x000000000043c894 in php_request_shutdown ()
#7 0x00000000004745aa in apache_php_module_main ()
#8 0x0000000000436076 in ap_get_server_built ()
#9 0x00000000005218ca in ap_invoke_handler ()
#10 0x000000000053971f in ap_update_mtime ()
#11 0x0000000000538ad3 in ap_process_request ()
#12 0x0000000000531c16 in suck_in_ap_validate_password ()
#13 0x00000000005306b4 in suck_in_ap_validate_password ()
#14 0x00000000005308c5 in suck_in_ap_validate_password ()
#15 0x000000000052f714 in suck_in_ap_validate_password ()
#16 0x000000000052db4a in main ()

[Xuefer]

Logged In: YES
user_id=185131

apache2 with php4-3-6
#0 0x4050de8b in _efree () from /www/modules/libphp4.so
#1 0x4074b4d1 in mmcache_clean_request ()
from /usr/local/lib/php/extensions/no-debug-non-zts-
20020429/mmcache.so
#2 0x40747aec in zm_deactivate_mmcache ()
from /usr/local/lib/php/extensions/no-debug-non-zts-
20020429/mmcache.so
#3 0x4051faf9 in module_registry_cleanup ()
from /www/modules/libphp4.so
#4 0x40522699 in zend_hash_apply ()
from /www/modules/libphp4.so
#5 0x4051cf6f in zend_deactivate_modules ()
from /www/modules/libphp4.so
#6 0x404f0048 in php_request_shutdown ()
from /www/modules/libphp4.so
#7 0x40531296 in php_handler ()
from /www/modules/libphp4.so
#8 0x080af7e0 in ap_invoke_handler ()
#9 0x0809164b in ap_process_request ()
#10 0x0808bd2c in ap_process_http_connection ()
#11 0x080bc385 in ap_process_connection ()
#12 0x080af2da in child_main ()
#13 0x080ae144 in make_child ()
#14 0x080ae4bb in perform_idle_server_maintenance ()
#15 0x080adaed in ap_mpm_run ()
#16 0x080b56a1 in main ()
#17 0x402b0657 in __libc_start_main (main=0x80b4cd0
<main>, argc=3,
ubp_av=0xbffffaf4, init=0x806693c <_init>, fini=0x80d5540
<_fini>,
rtld_fini=0x4100dc54 <_dl_fini>, stack_end=0xbffffaec)
at ../sysdeps/generic/libc-start.c:129