Description:
------------
apache 2.2.11 with php compiled as module crashes upon reading from unix socket while communicating with mysql (5.1.32, pdo driver). It happens only in some specific circumstances but I haven't been able to trace it so far. What is important is that php crashes always in the same point in my application which I confirmed by stracing apache.
Configure Command 	 './configure' '--prefix=/usr/local/php5' '--with-libdir=lib64' '--with-apxs2=/usr/sbin/apxs' '--with-curl' '--with-iconv' '--with-libxml-dir' '--with-mysql' '--with-openssl' '--with-pdo-mysql' '--with-pear' '--with-pcre-regex' '--with-zlib' '--disable-all' '--disable-cgi' '--disable-ipv6' '--enable-dom' '--enable-embedded-mysqli' '--enable-libxml' '--enable-memory-limit 

Reproduce code:
---------------
haven't been able to trace the bug to some specific code yet, but watching strace output I can see that php crashes always in the same moment. I will try to extract specific code that makes php crash.

Actual result:
--------------
socket(PF_FILE, SOCK_STREAM, 0)         = 34
fcntl(34, F_SETFL, O_RDONLY)            = 0
fcntl(34, F_GETFL)                      = 0x2 (flags O_RDWR)
fcntl(34, F_GETFL)                      = 0x2 (flags O_RDWR)
fcntl(34, F_SETFL, O_RDWR|O_NONBLOCK)   = 0
connect(34, {sa_family=AF_FILE, path="/var/lib/mysql/mysql.sock"...}, 110) = 0
fcntl(34, F_SETFL, O_RDWR)              = 0
setsockopt(34, SOL_SOCKET, SO_RCVTIMEO, "\2003\341\1\0\0\0\0\0\0\0\0\0\0\0\0"..., 16) = 0
setsockopt(34, SOL_SOCKET, SO_SNDTIMEO, "\2003\341\1\0\0\0\0\0\0\0\0\0\0\0\0"..., 16) = 0
setsockopt(34, SOL_IP, IP_TOS, [8], 4)  = -1 EOPNOTSUPP (Operation not supported)
setsockopt(34, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0
poll([{fd=34, events=POLLIN}], 1, 30000) = 1 ([{fd=34, revents=POLLIN}])
read(34, "4\0\0\0\n5.1.32\0\231)\0\0t7U&ZsT-\0\377\367\300\2\0\0\0\0"..., 16384) = 56
stat("/usr/share/mysql/charsets/Index.xml", {st_mode=S_IFREG|0644, st_size=18261, ...}) = 0
open("/usr/share/mysql/charsets/Index.xml", O_RDONLY) = 35
read(35, "<?xml version='1.0' encoding=\"utf"..., 18261) = 18261
close(35)                               = 0
write(34, "A\0\0\1\215\242\3\0\0\0\0@\10\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 69) = 69
read(34, "\1\0\0\2\376"..., 16384)      = 5
write(34, "\t\0\0\3OUGUSPI]\0"..., 13)  = 13
read(34, "\7\0\0\4\0\0\0\2\0\0\0"..., 16384) = 11
poll([{fd=34, events=POLLIN|POLLPRI}], 1, 0) = 0 (Timeout)
write(34, "\17\0\0\0\3SET NAMES utf8"..., 19) = 19
read(34, "\7\0\0\1\0\0\0\2\0\0\0"..., 16384) = 11
poll([{fd=34, events=POLLIN|POLLPRI}], 1, 0) = 0 (Timeout)
write(34, "\224\0\0\0\3SELECT `id`,`name`,`comment`"..., 152) = 152
read(34, "\1\0\0\1\0071\0\0\2\3def\5Lazer\tRightType\tRig"..., 16384) = 480
--- SIGSEGV (Segmentation fault) @ 0 (0) ---