Description:
------------
Note: this MAY be the same bug as #37866 but it was closed due to lack of CVS testing and I can not add a comment to it.

May also be related to #35886 but its marked fixed in cvs and win32 only.

Example background
------------------
karin# ll cache/profiles/c/cstdenis.html
-rw-r--r--  1 www  site5  23177 Nov 28 16:54 cache/profiles/c/cstdenis.html

All tests done via CLI. Not tested under apache

Reproduce code:
---------------
Code
----
<?php
echo file_get_contents('cache/profiles/c/cstdenis.html',  false, null, 1399);
?>
outputs contents of file from offset 1399

<?php
echo file_get_contents('cache/profiles/c/cstdenis.html',  false, null, 1400);
?>
Bus error

Expected result:
----------------
File contents from offset

Actual result:
--------------
Bus Error

Backtrace of core
-----------------
#0  0x28588322 in memcpy () from /lib/libc.so.6
[New LWP 100443]
(gdb) bt
#0  0x28588322 in memcpy () from /lib/libc.so.6
Cannot access memory at address 0xbfbfd29c


Latest CVS snap still has the same problem.

Backtrace of 5.2.1-dev core
----------------------------
#0  0x2869c329 in memcpy () from /lib/libc.so.6
(gdb) bt
#0  0x2869c329 in memcpy () from /lib/libc.so.6
Cannot access memory at address 0xbfbfd25c