There is a rather nasty crash possible in PHP due to the usage of the alloca() function as can be demonstrated by bug #28064.
Simpler bug replication case:
php -r ' $a = str_repeat("a", 1024 * 1024 * 6); defined($a); '
The following two fragments will lead to virtually identical code:
void foo()
{
char bar[2048];
...
}and
void foo()
{
char *bar = alloca(2048);
....They both start out by moving the stack pointer down 2k to leave enough room for bar, and they will both crash in a similar way if the stack doesn't have enough room available.
I think that not alloca() itself but its improper use is the problem here. Any function will cause a crash if you call it when your stack is full. Just be sensible about when (not to) use it.
-- Ard
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