Re: [PHP-DEV] Memory manager fast_cache_list_entry corruption From: Zeev Suraski (zeev <email protected>)
Date: 01/05/01

The problem is most likely not in the memory manager, but in a piece of
code that uses it. Perhaps the same element is freed twice for some reason
(bug). Did you try building a debug build? Didn't you happen to see
warnings about freeing an already-freed element?

Zeev

At 18:24 5/1/2001, Bill Stoddard wrote:
>Running PHP as a servlet under Tomcat on AIX and I am getting a consistent
>segfault on the third call to jver.php. I've debugged to the point of
>identifying a corrupted fast_cache_list_entry. Specifically, while iterating
>through the while loop in shutdown_memory_manager (see below), I hit a
>fast_cache_list_entry whose next pointer points back to itself. efree is
>called multiple times on the same address which eventually results in a seg
>fault. Hoping someone more familier with the code may have some insite on
>where I might look for the bug.
>
>Thanks,
>Bill
>
> >From zend_alloc.c...
>
>ZEND_API void shutdown_memory_manager(int silent, int clean_cache)
>{
>
><snip>
>
> for (fci=0; fci<MAX_FAST_CACHE_TYPES; fci++) {
> fast_cache_list_entry = AG(fast_cache_list_head)[fci];
> while (fast_cache_list_entry) {
> next_fast_cache_list_entry = fast_cache_list_entry->next;
> efree(fast_cache_list_entry);
> fast_cache_list_entry = next_fast_cache_list_entry;
> }
>}
>
>
>
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--
Zeev Suraski <zeev <email protected>>
CTO &  co-founder, Zend Technologies Ltd. http://www.zend.com/

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