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From Mark Thom <>
Subject [users@httpd] Apache/2.2.22 - child pid exit signal Bus error (7)
Date Sat, 15 Mar 2014 16:38:23 GMT
I'm fighting from few days with "signal Bus error(7)" on my Apache
instance, and i can't figure out what is wrong and what thing is causing
this error.. Thanks in advance for any suggestions what can be wrong!

OS: Debian 7.4 amd64

# apache2 -V

Server version: Apache/2.2.22 (Debian)
Server built:   Feb  1 2014 21:26:04
Server's Module Magic Number: 20051115:30
Server loaded:  APR 1.4.6, APR-Util 1.4.1
Compiled using: APR 1.4.6, APR-Util 1.4.1
Architecture:   64-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D HTTPD_ROOT="/etc/apache2"
 -D SUEXEC_BIN="/usr/lib/apache2/suexec"
 -D DEFAULT_PIDLOG="/var/run/"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_LOCKFILE="/var/run/apache2/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="mime.types"
 -D SERVER_CONFIG_FILE="apache2.conf"

Module enabled:

LoadModule alias_module /usr/lib/apache2/modules/
LoadModule auth_basic_module /usr/lib/apache2/modules/
LoadModule authn_file_module /usr/lib/apache2/modules/
LoadModule authz_default_module
LoadModule authz_groupfile_module
LoadModule authz_host_module /usr/lib/apache2/modules/
LoadModule authz_user_module /usr/lib/apache2/modules/
LoadModule autoindex_module /usr/lib/apache2/modules/
LoadModule deflate_module /usr/lib/apache2/modules/
LoadModule dir_module /usr/lib/apache2/modules/
LoadModule env_module /usr/lib/apache2/modules/
LoadModule headers_module /usr/lib/apache2/modules/
LoadModule mime_module /usr/lib/apache2/modules/
LoadModule negotiation_module /usr/lib/apache2/modules/
LoadModule php5_module /usr/lib/apache2/modules/
LoadModule reqtimeout_module /usr/lib/apache2/modules/
LoadModule rewrite_module /usr/lib/apache2/modules/
LoadModule setenvif_module /usr/lib/apache2/modules/
LoadModule ssl_module /usr/lib/apache2/modules/
LoadModule status_module /usr/lib/apache2/modules/
LoadModule unique_id_module /usr/lib/apache2/modules/

Message from error logs:

[Sat Mar 15 14:56:01 2014] [notice] child pid 18171 exit signal Bus error
(7), possible coredump in /tmp/dump
[Sat Mar 15 15:02:32 2014] [notice] child pid 18293 exit signal Bus error
(7), possible coredump in /tmp/dump
[Sat Mar 15 15:08:26 2014] [notice] child pid 18172 exit signal Bus error
(7), possible coredump in /tmp/dump
[Sat Mar 15 15:23:00 2014] [notice] child pid 18181 exit signal Bus error
(7), possible coredump in /tmp/dump

There is no more details in accesslog / php logs.


# gdb /usr/sbin/apache2 core
GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
Reading symbols from /usr/sbin/apache2...Reading symbols from
[New LWP 23033]

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

separate debug info file has no debug info
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/".

warning: the debug information found in
"/usr/lib/debug//usr/lib/php5/20100525/" does not match
"/usr/lib/php5/20100525/" (CRC mismatch).

warning: the debug information found in
"/usr/lib/debug/usr/lib/php5/20100525/" does not match
"/usr/lib/php5/20100525/" (CRC mismatch).

warning: the debug information found in
"/usr/lib/debug//usr/lib/php5/20100525/" does not match
"/usr/lib/php5/20100525/" (CRC mismatch).

warning: the debug information found in
"/usr/lib/debug/usr/lib/php5/20100525/" does not match
"/usr/lib/php5/20100525/" (CRC mismatch).

warning: the debug information found in
"/usr/lib/debug//usr/lib/php5/20100525/" does not match
"/usr/lib/php5/20100525/" (CRC mismatch).

warning: the debug information found in
"/usr/lib/debug/usr/lib/php5/20100525/" does not match
"/usr/lib/php5/20100525/" (CRC mismatch).

Core was generated by `/usr/sbin/apache2 -k start'.
Program terminated with signal 7, Bus error.
#0  0x00007f74d7778300 in ?? () from /lib/x86_64-linux-gnu/
(gdb) bt
#0  0x00007f74d7778300 in ?? () from /lib/x86_64-linux-gnu/
#1  0x00007f74d40d7658 in memcpy (__len=16384, __src=0x7f74d2066000,
__dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:52
#2  do_ssl3_write (s=s@entry=0x7f74da39a5f0, type=type@entry=23,
buf=buf@entry=0x7f74d2066000 <Address 0x7f74d2066000 out of bounds>,
    create_empty_fragment=create_empty_fragment@entry=0) at s3_pkt.c:798
#3  0x00007f74d40d77c3 in ssl3_write_bytes (s=0x7f74da39a5f0, type=23,
buf_=0x7f74d2066000, len=<optimized out>) at s3_pkt.c:609
#4  0x00007f74d0ba3f1d in ssl_filter_write (len=40766, data=<optimized
out>, f=<optimized out>) at ssl_engine_io.c:801
#5  ssl_io_filter_output (f=0x7f74d59bcbd0, bb=0x7f74d2079bd8) at
#6  0x00007f74d850bc7e in ap_http_header_filter (f=0x7f74d20825b8,
b=0x7f74d2079bd8) at http_filters.c:1327
#7  0x00007f74d84ebc00 in ap_content_length_filter (f=0x7f74d2082590,
b=0x7f74d2079bd8) at protocol.c:1371
#8  0x00007f74d850cf6f in ap_byterange_filter (f=0x7f74d2082568,
bb=0x7f74d2079bd8) at byterange_filter.c:262
#9  0x00007f74d84eefeb in default_handler (r=0x7f74d20810a0) at core.c:3815
#10 0x00007f74d84f9b50 in ap_run_handler (r=0x7f74d20810a0) at config.c:159
#11 0x00007f74d84f9f9b in ap_invoke_handler (r=r@entry=0x7f74d20810a0) at
#12 0x00007f74d850a078 in ap_process_request (r=r@entry=0x7f74d20810a0) at
#13 0x00007f74d8506f38 in ap_process_http_connection (c=0x7f74d59bc290) at
#14 0x00007f74d8500510 in ap_run_process_connection (c=0x7f74d59bc290) at
#15 0x00007f74d85008f8 in ap_process_connection (c=c@entry=0x7f74d59bc290,
csd=<optimized out>) at connection.c:190
#16 0x00007f74d850ec2e in child_main (child_num_arg=child_num_arg@entry=13)
at prefork.c:667
#17 0x00007f74d850f382 in make_child (slot=13, s=0x7f74d849a818) at
#18 make_child (s=0x7f74d849a818, slot=13) at prefork.c:696
#19 0x00007f74d850fee6 in perform_idle_server_maintenance (p=<optimized
out>) at prefork.c:903
#20 ap_mpm_run (_pconf=_pconf@entry=0x7f74d84a0028, plog=<optimized out>,
s=s@entry=0x7f74d849a818) at prefork.c:1107
#21 0x00007f74d84e4826 in main (argc=3, argv=0x7fff19de3128) at main.c:755

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