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Could you please supply a backtrace.

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I have experienced this bug too. It happens when you try to install pear. Here is what happens:

1) make install-pear

Installing PEAR environment:      /usr/local/lib/php/
sh: 81882 Memory fault - core dumped
*** Exit 139
Stop.
*** Exit 1
Stop.

Here is what I find out from the core file:

--snip--

Welcome to the Ladebug Debugger Version 65 (built Apr  4 2001 for Compaq Tru64 UNIX)
------------------
object file name: sapi/cli/php
core file name: core
Reading symbolic information ...done
Core file produced from executable 'php'
Thread 1 terminated at PC 0x1200edd80 by signal SEGV
(ladebug) where
>0  0x1200edd80 in php_strspn(s1=0x140081a18[Ladebug Warning: String is too long to display. Only the first $maxstrlen (128) chara
cters are shown.]="This class provides handling of tar files in PHP.\nIt supports creating, listing, extracting and adding to tar
files.\nGzip suppor", s2=0x140455fd8=" \t", s1_end=0x240081ad9=(null), s2_end=0x240455fda=(null)) "/usr/users/home/tstoev/download
s/php-4.3.1/ext/standard/string.c":1305
#1  0x1200e9788 in php_spn_common_handler(ht=2, return_value=0x14007fa58, this_ptr=0x0, return_value_used=1, behavior=0) "/usr/use
rs/home/tstoev/downloads/php-4.3.1/ext/standard/string.c":241
#2  0x1200e986c in zif_strspn(ht=2, return_value=0x14007fa58, this_ptr=0x0, return_value_used=1) "/usr/users/home/tstoev/downloads
/php-4.3.1/ext/standard/string.c":258
#3  0x1201a3670 in execute(op_array=0x140429758) "/usr/users/home/tstoev/downloads/php-4.3.1/Zend/zend_execute.c":1596
#4  0x1201a3934 in execute(op_array=0x140114258) "/usr/users/home/tstoev/downloads/php-4.3.1/Zend/zend_execute.c":1640
#5  0x12017eaf0 in call_user_function_ex(function_table=0x1403e6930, object_pp=0x140080988, function_name=0x14007f798, retval_ptr_
ptr=0x11ffeacd0, param_count=2, params=0x140455df8, no_separation=1, symbol_table=0x0) "/usr/users/home/tstoev/downloads/php-4.3.1
/Zend/zend_execute_API.c":557
#6  0x12017e130 in call_user_function(function_table=0x140068220, object_pp=0x140080988, function_name=0x14007f798, retval_ptr=0x1
40080158, param_count=2, params=0x11ffead80) "/usr/users/home/tstoev/downloads/php-4.3.1/Zend/zend_execute_API.c":399
#7  0x12011d8e0 in xml_call_handler(parser=0x140080918, handler=0x14007f798, argc=2, argv=0x11ffead80) "/usr/users/home/tstoev/dow
nloads/php-4.3.1/ext/xml/xml.c":377
#8  0x12011ea94 in _xml_endElementHandler(userData=0x140080918, name=0x140456d2a="description") "/usr/users/home/tstoev/downloads/
php-4.3.1/ext/xml/xml.c":730
#9  0x1201249d0 in doContent(parser=0x14010e100, startTagLevel=0, enc=0x140037290, s=0x140457387[Ladebug Warning: String is too lo
ng to display. Only the first $maxstrlen (128) characters are shown.]="</description>\n  <license>PHP License</license>\n  <mainta
iners>\n    <maintainer>\n      <user>vblavet</user>\n      <role>lead</ro", end=0x1404578b7="", nextPtr=0x0) "/usr/users/home/tst
oev/downloads/php-4.3.1/ext/xml/expat/xmlparse.c":1739
#10 0x120123d88 in contentProcessor(parser=0x14010e100, start=0x140457255[Ladebug Warning: String is too long to display. Only the
 first $maxstrlen (128) characters are shown.]="<package version=\"1.0\">\n  <name>Archive_Tar</name>\n  <summary>Tar file managem
ent class</summary>\n  <description>This class prov", end=0x1404578b7="", endPtr=0x0) "/usr/users/home/tstoev/downloads/php-4.3.1/
ext/xml/expat/xmlparse.c":1349
#11 0x120127b8c in doProlog(parser=0x14010e100, enc=0x140037290, s=0x140457255[Ladebug Warning: String is too long to display. Onl
y the first $maxstrlen (128) characters are shown.]="<package version=\"1.0\">\n  <name>Archive_Tar</name>\n  <summary>Tar file ma
nagement class</summary>\n  <description>This class prov", end=0x1404578b7="", tok=29, next=0x140457255[Ladebug Warning: String is
 too long to display. Only the first $maxstrlen (128) characters are shown.]="<package version=\"1.0\">\n  <name>Archive_Tar</name
>\n  <summary>Tar file management class</summary>\n  <description>This class prov", nextPtr=0x0) "/usr/users/home/tstoev/downloads
/php-4.3.1/ext/xml/expat/xmlparse.c":2687
#12 0x120126848 in prologProcessor(parser=0x14010e100, s=0x140457200[Ladebug Warning: String is too long to display. Only the firs
t $maxstrlen (128) characters are shown.]="<?xml version=\"1.0\" encoding=\"ISO-8859-1\" ?>\n<!DOCTYPE package SYSTEM \"package.dt
d\">\n<package version=\"1.0\">\n  <name>Archive_Tar", end=0x1404578b7="", nextPtr=0x0) "/usr/users/home/tstoev/downloads/php-4.3.
1/ext/xml/expat/xmlparse.c":2523
#13 0x1201267c8 in prologInitProcessor(parser=0x14010e100, s=0x140457200[Ladebug Warning: String is too long to display. Only the
first $maxstrlen (128) characters are shown.]="<?xml version=\"1.0\" encoding=\"ISO-8859-1\" ?>\n<!DOCTYPE package SYSTEM \"packag
e.dtd\">\n<package version=\"1.0\">\n  <name>Archive_Tar", end=0x1404578b7="", nextPtr=0x0) "/usr/users/home/tstoev/downloads/php-
4.3.1/ext/xml/expat/xmlparse.c":2512
#14 0x120123810 in php_XML_ParseBuffer(parser=0x14010e100, len=1719, isFinal=1) "/usr/users/home/tstoev/downloads/php-4.3.1/ext/xm
l/expat/xmlparse.c":1150
#15 0x120123760 in php_XML_Parse(parser=0x14010e100, s=0x140432018[Ladebug Warning: String is too long to display. Only the first
$maxstrlen (128) characters are shown.]="<?xml version=\"1.0\" encoding=\"ISO-8859-1\" ?>\n<!DOCTYPE package SYSTEM \"package.dtd\
">\n<package version=\"1.0\">\n  <name>Archive_Tar", len=1719, isFinal=1) "/usr/users/home/tstoev/downloads/php-4.3.1/ext/xml/expa
t/xmlparse.c":1140
#16 0x120120f50 in zif_xml_parse(ht=3, return_value=0x140080118, this_ptr=0x0, return_value_used=1) "/usr/users/home/tstoev/downlo
ads/php-4.3.1/ext/xml/xml.c":1340
#17 0x1201a3670 in execute(op_array=0x140114558) "/usr/users/home/tstoev/downloads/php-4.3.1/Zend/zend_execute.c":1596
#18 0x1201a3934 in execute(op_array=0x140114498) "/usr/users/home/tstoev/downloads/php-4.3.1/Zend/zend_execute.c":1640
#19 0x1201a3934 in execute(op_array=0x14017bf58) "/usr/users/home/tstoev/downloads/php-4.3.1/Zend/zend_execute.c":1640
#20 0x1201a3934 in execute(op_array=0x14010c098) "/usr/users/home/tstoev/downloads/php-4.3.1/Zend/zend_execute.c":1640
#21 0x12018b8f4 in zend_execute_scripts(type=8, retval=0x0, file_count=3) "/usr/users/home/tstoev/downloads/php-4.3.1/Zend/zend.c"
:864
#22 0x12014c4a0 in php_execute_script(primary_file=0x11fffbd00) "/usr/users/home/tstoev/downloads/php-4.3.1/main/main.c":1573
#23 0x1201a8340 in main(argc=7, argv=0x11fffc018) "/usr/users/home/tstoev/downloads/php-4.3.1/sapi/cli/php_cli.c":746
#24 0x12003e538 in __start(0x300000000, 0x0, 0x140455fdb, 0x240455fda, 0x1404ae001, 0x1000000c1) in sapi/cli/php
(ladebug)

--snip--

From what I can tell it has something to do with the XML parser that parses the XML files that handle the installation.

Let me know if you need anymore info.