Are you dl('')'ing and modules, - I think Zeev pointed me to a known
bug with this if you have a memory leak from a dl'ed module it will
crash on this type of debugging code (I think the filename gets freed
when you unload the module at shutdown, and hence filename points to an
out of bounds area)
Regards
Alan
Ramesh Shankar wrote:
> I am trying to port PHP and I am running into a problem with Apache
> 1.3. I am not familiar with the PHP language by itself and I am used
> to working at the O.S. level and so any help would be greatly
> appreciated. I tried to read through mailing list archives, the
> readmes, FAQs etc, but I couldn't find answer for this question:
>
> When PHP is loaded with Apache 1.3 and Apache is shutdown, PHP 4.2.2
> crashes inside the routine _efree() called from bc_free_num(). I found
> the problem to be related to linked list corruption and on further
> investigation, suspected it to be a case of the thread calling
> bc_free_num() to be different from that of the thread that called
> bc_new_num(). I verfied this by enabling TSRM_DEBUG while building
> zend, which enables this detection in _efree(). I also set the
> tsrm_error_level to TSRM_ERROR_LEVEL_ERROR to enable dispalying of
> TSRM messages to the screen. And sure enough, I got an error message
> from _efree() from the following excerpt:
>
> #if defined(ZTS) && TSRM_DEBUG
> if (p->thread_id != tsrm_thread_id()) {
> tsrm_error(TSRM_ERROR_LEVEL_ERROR, "Memory block allocated at
> %s:(%d) on thread %x freed at %s:(%d) on thread %x, ignoring",
> p->filename, p->lineno, p->thread_id,
> __zend_filename, __zend_lineno, tsrm_thread_id());
> return;
> }
> #endif
>
> I have ZTS defined thread support in Zend.
>
> I am not able to understand and appreciate all the details of the use
> of the macros to access the globals variables via AG(), CG() etc and
> from what I could figure out, ts_resource_ex()is some kind of thread
> specific data mechanism and would work only if threads are dedicated
> to PHP.
>
> I am not able to understand who is responsible for ensuring that the
> same thread gets used for a complete request - whether it is some
> thing that I need to do in Apache or whether I need to enable/disable
> something while compiling PHP.
>
> Any help would be greatly appreciated. Please copy me on your reply as
> well.
>
> Thanks in advance,
>
> S.R.
>
>
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