Please try the latest RC from http://xdebug.org/download.php and see if that works.

2.1.0RC1 seams segfaulted on the same manner. May be it live on few seconds longer and 3-4 debug steps may be accomplished...

Now I downgrade php to 5.2.10 version and on it both versions of xdebug works fine.

Please make a proper backtrace then, as yours doesn't show anything useful. Try with PHP 5.3 and the 2.1.0RC1 though! See the instructions at http://bugs.php.net/bugs-generating-backtrace.php under "If you can't get a core file"

Probably the same issue, Ubuntu 10.04. Test case:

testcase.php:
<?php

eval(file_get_contents("cache.php"));

cache.php:
function whatever() {};

Core was generated by `php testcase.php'.
Program terminated with signal 11, Segmentation fault.
#0 0x009da785 in ?? () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0 0x009da785 in ?? () from /lib/tls/i686/cmov/libc.so.6
#1 0x0825f45c in php_addcslashes (str=0x17b0af43 <Address 0x17b0af43 out of bounds>, length=0, new_length=0xbfcf3624, should_free=0, what=0x3f22ea "'\", wlength=6)
at /build/buildd/php5-5.3.2/ext/standard/string.c:3121
0000002 0x003e6b0a in xdebug_var_export (struc=0xbfcf3680, str=0xbfcf3660, level=1, debug_zval=0, options=0xa941e28) at /build/buildd/xdebug-2.0.5/build-php5/xdebug_var.c:283
0000003 0x003e6fc6 in xdebug_get_zval_value (val=0xa8cfe70, debug_zval=0, options=0xa941e28) at /build/buildd/xdebug-2.0.5/build-php5/xdebug_var.c:365
0000004 0x003cd985 in add_stack_frame (zdata=0xa901824, op_array=0xa8d0bcc, type=2) at /build/buildd/xdebug-2.0.5/build-php5/xdebug.c:1081
0000005 0x003cee3f in xdebug_execute (op_array=0xa8d0bcc) at /build/buildd/xdebug-2.0.5/build-php5/xdebug.c:1512
0000006 0x08348c36 in ZEND_INCLUDE_OR_EVAL_SPEC_VAR_HANDLER (execute_data=0xa901824) at /build/buildd/php5-5.3.2/Zend/zend_vm_execute.h:8576
0000007 0x08333d8e in execute (op_array=0xa8d044c) at /build/buildd/php5-5.3.2/Zend/zend_vm_execute.h:104
0000008 0x003cf015 in xdebug_execute (op_array=0xa8d044c) at /build/buildd/xdebug-2.0.5/build-php5/xdebug.c:1562
0000009 0x08309fa6 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /build/buildd/php5-5.3.2/Zend/zend.c:1266
0000010 0x082ae754 in php_execute_script (primary_file=0xbfcf5e14) at /build/buildd/php5-5.3.2/main/main.c:2288
0000011 0x083a0c28 in main (argc=2, argv=0xbfcf5f54) at /build/buildd/php5-5.3.2/sapi/cli/php_cli.c:1196

I had a similar problem with the released version of XDebug on windows 7, using php 5.3.2 on Apache and IIS. It made my scripts crash with a weird error in the browser, stating that the request was reinitialized and the browser only showing that warning.

Because I found this entry here I tried the RC1 version as Derick recommended and it worked just fine. It took me quite some time to figure out why it wasn't working, because I never bothered to install XDebug before. Now that I did, I am quite happy and I hope this will help someone else who has the same problem.

Thanks Derick!

The same issue. I use Fedora 13, PHP 5.3.2. Crash reproduced on XDebug 2.0.5 and 2.1.0RC1.

Backtrace:
glibc detected httpd: double free or corruption (!prev): 0x00007f3eeced4890 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x3f2ea75726)[0x7f3eea951726]
/usr/lib64/php/modules/xdebug.so(xdebug_dbgp_deinit+0x3e2)[0x7f3ed8d3dc17]
/usr/lib64/php/modules/xdebug.so(zm_post_zend_deactivate_xdebug+0x3c)[0x7f3ed8d2a1c4]
/etc/httpd/modules/libphp5.so(+0x20fef2)[0x7f3ee09eaef2]
/etc/httpd/modules/libphp5.so(zend_hash_apply+0x45)[0x7f3ee09f7545]
/etc/httpd/modules/libphp5.so(+0x210a97)[0x7f3ee09eba97]
/etc/httpd/modules/libphp5.so(php_request_shutdown+0x385)[0x7f3ee099a3c5]
/etc/httpd/modules/libphp5.so(+0x298d07)[0x7f3ee0a73d07]
httpd(ap_run_handler+0x70)[0x7f3eec3c26d0]
httpd(ap_invoke_handler+0x98)[0x7f3eec3c5f48]
httpd(ap_process_request+0x1c0)[0x7f3eec3d1520]
httpd(+0x37428)[0x7f3eec3ce428]
httpd(ap_run_process_connection+0x68)[0x7f3eec3ca198]
httpd(+0x3eef7)[0x7f3eec3d5ef7]
httpd(+0x3f1c6)[0x7f3eec3d61c6]
httpd(ap_mpm_run+0x5a3)[0x7f3eec3d6813]
httpd(main+0xb40)[0x7f3eec3ae890]
/lib64/libc.so.6(__libc_start_main+0xfd)[0x7f3eea8fac5d]
httpd(+0x16849)[0x7f3eec3ad849]

OP didn't provide feedback, and I can't reproduce this with latest SVN.