$ gdb /usr/bin/php
Reading symbols from /usr/bin/php...(no debugging symbols found)...done.
(gdb) r -C -q -d include_path=/usr/share/pear -d output_buffering=1 -d variables_order=EGPCS -d open_basedir= -d safe_mode=0 -d register_argc_argv=On -d auto_prepend_file= -d auto_append_file= /usr/share/pear/pearcmd.php download Math_Matrix
Starting program: /usr/bin/php -C -q -d include_path=/usr/share/pear -d output_buffering=1 -d variables_order=EGPCS -d open_basedir= -d safe_mode=0 -d register_argc_argv=On -d auto_prepend_file= -d auto_append_file= /usr/share/pear/pearcmd.php download Math_Matrix
WARNING: channel "pear.php.net" has updated its protocols, use "pear channel-update pear.php.net" to update
downloading Math_Matrix-0.8.0.tgz ...
Starting to download Math_Matrix-0.8.0.tgz (12,450 bytes)
.....done: 12,450 bytes

Program received signal SIGSEGV, Segmentation fault.
0xb7c75e96 in memcpy () from /lib/libc.so.6
(gdb) bt
#0  0xb7c75e96 in memcpy () from /lib/libc.so.6
#1  0x00001200 in ?? ()
#2  0xb7ee2ae6 in flush_pending () from /usr/lib/libz.so.1
#3  0xb7ee41c7 in deflate () from /usr/lib/libz.so.1
#4  0xb7ee7418 in gz_comp () from /usr/lib/libz.so.1
#5  0xb7ee7746 in gzflush () from /usr/lib/libz.so.1
#6  0x0809bfee in ?? ()
#7  0x0898dbd8 in ?? ()
#8  0x00000002 in ?? ()
#9  0xbfffc8e8 in ?? ()
#10 0x081884f8 in php_trim ()
#11 0x081e44ba in _php_stream_free ()
#12 0x081e476b in ?? ()
#13 0x08bfdfe0 in ?? ()
#14 0x0000000b in ?? ()
#15 0x00000000 in ?? ()