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Posted by Stefan Braumeister on 06/21/07 16:19
I was able to find and fix the bug myself. As soon as i installed php
5.1 I was able to reproduce the error with the gdb and fix it.
Stefan Braumeister schrieb:
> Hi NG,
>
> I got some difficult problem that drives me nuts.
>
> I wrote a relatively simple extension that reads binary files and
> extracts some data. If I call the script, that uses my extension via
> webbrowser, apache sometimes segfaults with:
>
> *** glibc detected *** free(): invalid next size (normal):
> 0x0000555555a7c240 ***
> [Thu Jun 21 11:57:59 2007] [notice] child pid 2487 exit signal Aborted (6)
>
> A backtrace with gdb attached to apache shows:
>
> #0 0x00002b080b52621d in raise () from /lib64/tls/libc.so.6
> #1 0x00002b080b527a1e in abort () from /lib64/tls/libc.so.6
> #2 0x00002b080b55b291 in __libc_message () from /lib64/tls/libc.so.6
> #3 0x00002b080b560eae in _int_free () from /lib64/tls/libc.so.6
> #4 0x00002b080b5611f6 in free () from /lib64/tls/libc.so.6
> #5 0x00002b0810258b53 in _efree () from /etc/httpd/modules/libphp4.so
> #6 0x00002b081025fc56 in _zval_ptr_dtor () from
> /etc/httpd/modules/libphp4.so
> #7 0x00002b081026ebe6 in zend_hash_clean () from
> /etc/httpd/modules/libphp4.so
> #8 0x00002b081027c8f2 in execute () from /etc/httpd/modules/libphp4.so
> #9 0x00002b081027b3e2 in execute () from /etc/httpd/modules/libphp4.so
> #10 0x00002b081026a00e in zend_execute_scripts () from
> /etc/httpd/modules/libphp4.so
> #11 0x00002b081023d733 in php_execute_script () from
> /etc/httpd/modules/libphp4.so
> #12 0x00002b0810284b89 in execute () from /etc/httpd/modules/libphp4.so
> #13 0x00005555555719f3 in ap_run_handler () from /usr/sbin/httpd
> #14 0x0000555555571eb1 in ap_invoke_handler () from /usr/sbin/httpd
> #15 0x000055555556ecb8 in ap_process_request () from /usr/sbin/httpd
> #16 0x000055555556a089 in _start () from /usr/sbin/httpd
> #17 0x000055555557b693 in ap_run_process_connection () from /usr/sbin/httpd
> #18 0x000055555556fb20 in ap_graceful_stop_signalled () from /usr/sbin/httpd
> #19 0x000055555556fdfa in ap_graceful_stop_signalled () from /usr/sbin/httpd
> #20 0x000055555556fea4 in ap_graceful_stop_signalled () from /usr/sbin/httpd
> #21 0x00005555555705db in ap_mpm_run () from /usr/sbin/httpd
> #22 0x0000555555576cef in main () from /usr/sbin/httpd
> (gdb)
>
> with valgrind php -f myscript.php I tested for mem leaks, but valgrind
> doesn't detect anything.
>
> If I debug the script directly with:
>
> gdb php
> run myscript.php
>
> I cannot reproduce the problem.
>
> Any idea what could be wrong, besides a bug in php or apache?
>
> My target machine is Cent OS 4.4 x86_64 with php 4.3.9
>
> Thanks Stefan
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