如何诊断此 PHP 分段错误？

我正在运行一个命令行 PHP 作业，导致分段错误。这项工作已经工作了很长时间，但它处理通过电子邮件发送的内容。显然，这封电子邮件中有一些东西打破了它，但我不知道是什么。如果我把核心文件放在gdb中，它真的无济于事：

$ gdb /usr/local/bin/php core.20381 
GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/local/bin/php...done.
[New Thread 20381]

warning: Can't read pathname for load map: Input/output error.
Reading symbols from /lib/libcrypt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libcrypt.so.1
Reading symbols from /lib/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/librt.so.1
Reading symbols from /usr/lib/libmysqlclient_r.so.15...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libmysqlclient_r.so.15
Reading symbols from /lib/libpthread.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /lib/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libz.so.1
Reading symbols from /usr/lib/libmcrypt.so.4...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libmcrypt.so.4
Reading symbols from /usr/lib/libltdl.so.7...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libltdl.so.7
Reading symbols from /lib/libpng12.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libpng12.so.0
Reading symbols from /lib/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libnsl.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libnsl.so.1
Reading symbols from /usr/lib/libcurl-gnutls.so.4...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libcurl-gnutls.so.4
Reading symbols from /usr/lib/libxml2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libxml2.so.2
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/libresolv.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libresolv.so.2
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib/libidn.so.11...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libidn.so.11
Reading symbols from /usr/lib/liblber-2.4.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/liblber-2.4.so.2
Reading symbols from /usr/lib/libldap_r-2.4.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libldap_r-2.4.so.2
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/libgnutls.so.26...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnutls.so.26
Reading symbols from /lib/libgcrypt.so.11...(no debugging symbols found)...done.
Loaded symbols for /lib/libgcrypt.so.11
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/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/libkrb5support.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libkrb5support.so.0
Reading symbols from /lib/libkeyutils.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libkeyutils.so.1
Reading symbols from /usr/lib/libtasn1.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libtasn1.so.3
Reading symbols from /lib/libgpg-error.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libgpg-error.so.0
Reading symbols from /lib/libgcc_s.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libgcc_s.so.1
Reading symbols from /lib/libnss_files.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libnss_files.so.2
Can't read symbols from system-supplied DSO at 0x7fffb4bfc000: File truncated
Core was generated by `/usr/local/bin/php /src/prod/current/utils/cron.php --run=/utils/proces'.
Program terminated with signal 11, Segmentation fault.
#0  match (
    eptr=0x1370a887 "/td>\n\t\t\t\t\t\t\n\t\t\t\t\t</tr>\n\t\t\t\t\t\n\t\t\t\t</table>\n\t\t\t</td>\n\t\t</tr>\n\t\t\n\t\t<tr>\n\t\t\t<td style=\"border-top:3px solid #efefef; padding:20px 10px;\">\n\t\t\t\t<table style=\"width:100%;\">\n\t\t\t\t\t<tr>\n\t\t\t\t\t\t\n", '\t' <repeats 12 times>, "\n\t\t\t\t"..., ecode=0x133dc3aa "N", 
    mstart=0x13708600 "<html>\n<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1, maximum-scale=1\">\n\n</head>\n\n<body style=\"padding"..., markptr=0x0, offset_top=4, md=0x7fffb4b1b620, ims=0, eptrb=0x0, flags=0, rdepth=17680) at /home/farmer/srcs/php-5.3.4/ext/pcre/pcrelib/pcre_exec.c:470
470 {

如果我做一个“bt”，我只是一遍又一遍地得到这个“匹配”语句。以下是前几个：

#1  0x000000000046ef1e in match (
    eptr=0x1370a887 "/td>\n\t\t\t\t\t\t\n\t\t\t\t\t</tr>\n\t\t\t\t\t\n\t\t\t\t</table>\n\t\t\t</td>\n\t\t</tr>\n\t\t\n\t\t<tr>\n\t\t\t<td style=\"border-top:3px solid #efefef; padding:20px 10px;\">\n\t\t\t\t<table style=\"width:100%;\">\n\t\t\t\t\t<tr>\n\t\t\t\t\t\t\n", '\t' <repeats 12 times>, "\n\t\t\t\t"..., ecode=0x133dc3a5 "_", mstart=<value optimized out>, markptr=<value optimized out>, 
    offset_top=<value optimized out>, md=0x7fffb4b1b620, ims=0, eptrb=0x0, flags=0, rdepth=17679) at /home/farmer/srcs/php-5.3.4/ext/pcre/pcrelib/pcre_exec.c:803
#2  0x0000000000479789 in match (
    eptr=0x1370a887 "/td>\n\t\t\t\t\t\t\n\t\t\t\t\t</tr>\n\t\t\t\t\t\n\t\t\t\t</table>\n\t\t\t</td>\n\t\t</tr>\n\t\t\n\t\t<tr>\n\t\t\t<td style=\"border-top:3px solid #efefef; padding:20px 10px;\">\n\t\t\t\t<table style=\"width:100%;\">\n\t\t\t\t\t<tr>\n\t\t\t\t\t\t\n", '\t' <repeats 12 times>, "\n\t\t\t\t"..., ecode=0x133dc5ca "V\002%\033U\002.", mstart=<value optimized out>, 
    markptr=<value optimized out>, offset_top=<value optimized out>, md=0x7fffb4b1b620, ims=0, eptrb=0x0, flags=0, rdepth=<value optimized out>)
    at /home/farmer/srcs/php-5.3.4/ext/pcre/pcrelib/pcre_exec.c:1623
#3  0x000000000046ef1e in match (
    eptr=0x1370a886 "</td>\n\t\t\t\t\t\t\n\t\t\t\t\t</tr>\n\t\t\t\t\t\n\t\t\t\t</table>\n\t\t\t</td>\n\t\t</tr>\n\t\t\n\t\t<tr>\n\t\t\t<td style=\"border-top:3px solid #efefef; padding:20px 10px;\">\n\t\t\t\t<table style=\"width:100%;\">\n\t\t\t\t\t<tr>\n\t\t\t\t\t\t\n", '\t' <repeats 12 times>, "\n\t\t\t"..., ecode=0x133dc3a5 "_", mstart=<value optimized out>, markptr=<value optimized out>, 
    offset_top=<value optimized out>, md=0x7fffb4b1b620, ims=0, eptrb=0x0, flags=0, rdepth=17677) at /home/farmer/srcs/php-5.3.4/ext/pcre/pcrelib/pcre_exec.c:803
#4  0x0000000000479789 in match (
    eptr=0x1370a886 "</td>\n\t\t\t\t\t\t\n\t\t\t\t\t</tr>\n\t\t\t\t\t\n\t\t\t\t</table>\n\t\t\t</td>\n\t\t</tr>\n\t\t\n\t\t<tr>\n\t\t\t<td style=\"border-top:3px solid #efefef; padding:20px 10px;\">\n\t\t\t\t<table style=\"width:100%;\">\n\t\t\t\t\t<tr>\n\t\t\t\t\t\t\n", '\t' <repeats 12 times>, "\n\t\t\t"..., ecode=0x133dc5ca "V\002%\033U\002.", mstart=<value optimized out>, 
    markptr=<value optimized out>, offset_top=<value optimized out>, md=0x7fffb4b1b620, ims=0, eptrb=0x0, flags=0, rdepth=<value optimized out>)
    at /home/farmer/srcs/php-5.3.4/ext/pcre/pcrelib/pcre_exec.c:1623
#5  0x000000000046ef1e in match (
    eptr=0x1370a885 "\t</td>\n\t\t\t\t\t\t\n\t\t\t\t\t</tr>\n\t\t\t\t\t\n\t\t\t\t</table>\n\t\t\t</td>\n\t\t</tr>\n\t\t\n\t\t<tr>\n\t\t\t<td style=\"border-top:3px solid #efefef; padding:20px 10px;\">\n\t\t\t\t<table style=\"width:100%;\">\n\t\t\t\t\t<tr>\n\t\t\t\t\t\t\n", '\t' <repeats 12 times>, "\n\t\t"..., ecode=0x133dc3a5 "_", mstart=<value optimized out>, markptr=<value optimized out>, 
    offset_top=<value optimized out>, md=0x7fffb4b1b620, ims=0, eptrb=0x0, flags=0, rdepth=17675) at /home/farmer/srcs/php-5.3.4/ext/pcre/pcrelib/pcre_exec.c:803

我在这里真的很茫然。我尝试过在 strace 中运行该命令，它似乎在 PEAR Mail_Queue库中存在 seg 错误。这是strace的结尾（一些识别信息已被删除）：

lstat("/src/prod/releases/20121025202143/www/application/pear/MDB2/Driver/mysql.php", {st_mode=S_IFREG|0770, st_size=55723, ...}) = 0
lstat("/src/prod/releases/20121025202143/www/application/pear/MDB2/Driver", {st_mode=S_IFDIR|0770, st_size=4096, ...}) = 0
lstat("/src/prod/releases/20121025202143/www/application/pear/MDB2", {st_mode=S_IFDIR|0770, st_size=4096, ...}) = 0
lstat("/src/prod/releases/20121025202143/www/application/pear", {st_mode=S_IFDIR|0770, st_size=4096, ...}) = 0
open("/src/prod/releases/20121025202143/www/application/pear/MDB2/Driver/mysql.php", O_RDONLY) = 6
fstat(6, {st_mode=S_IFREG|0770, st_size=55723, ...}) = 0
fstat(6, {st_mode=S_IFREG|0770, st_size=55723, ...}) = 0
fstat(6, {st_mode=S_IFREG|0770, st_size=55723, ...}) = 0
mmap(NULL, 55723, PROT_READ, MAP_SHARED, 6, 0) = 0x2b49f7bb4000
brk(0x987b000)                          = 0x987b000
brk(0x98bb000)                          = 0x98bb000
munmap(0x2b49f7bb4000, 55723)           = 0
close(6)                                = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 6
fcntl(6, F_SETFL, O_RDONLY)             = 0
fcntl(6, F_GETFL)                       = 0x2 (flags O_RDWR)
fcntl(6, F_GETFL)                       = 0x2 (flags O_RDWR)
fcntl(6, F_SETFL, O_RDWR|O_NONBLOCK)    = 0
connect(6, {sa_family=AF_INET, sin_port=htons(3306), sin_addr=inet_addr("IP ADDRESS TO DB SERVER REMOVED")}, 16) = -1 EINPROGRESS (Operation now in progress)
fcntl(6, F_SETFL, O_RDWR)               = 0
poll([{fd=6, events=POLLIN|POLLPRI}], 1, 60000) = 1 ([{fd=6, revents=POLLIN}])
setsockopt(6, SOL_SOCKET, SO_RCVTIMEO, "\2003\341\1\0\0\0\0\0\0\0\0\0\0\0\0", 16) = 0
setsockopt(6, SOL_SOCKET, SO_SNDTIMEO, "\2003\341\1\0\0\0\0\0\0\0\0\0\0\0\0", 16) = 0
setsockopt(6, SOL_IP, IP_TOS, [8], 4)   = 0
setsockopt(6, SOL_TCP, TCP_NODELAY, [1], 4) = 0
setsockopt(6, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0
poll([{fd=6, events=POLLIN}], 1, 60000) = 1 ([{fd=6, revents=POLLIN}])
read(6, "C\0\0\0\n5.1.37-1ubuntu5.5-log\0Q\257\3\0009"..., 16384) = 71
write(6, "=\0\0\1\205\242\2\0\0\0\0@\10\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 65) = 65
read(6, "\7\0\0\2\0\0\0\2\0\0\0", 16384) = 11
poll([{fd=6, events=POLLIN|POLLPRI}], 1, 0) = 0 (Timeout)
write(6, "\10\0\0\0\2xxxxx", 12)      = 12
read(6, "\7\0\0\1\0\0\0\2\0\0\0", 16384) = 11
lstat("/src/prod/current/www/application/pear/Mail/mime.php", {st_mode=S_IFREG|0770, st_size=50252, ...}) = 0
lstat("/src/prod/current/www/application/pear/Mail", {st_mode=S_IFDIR|0770, st_size=4096, ...}) = 0
lstat("/src/prod/current/www/application/pear", {st_mode=S_IFDIR|0770, st_size=4096, ...}) = 0
lstat("/src/prod/current/www/application", {st_mode=S_IFDIR|0776, st_size=4096, ...}) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
Segmentation fault

如果有人对调查线有任何想法或指示，我将不胜感激。我真的被这个难住了。